Configure a StorNext File System on Windows

Follow the steps below to label a disk.

1. Select the disks you wish to label. If desired, verify that the disks selected are the correct ones by pressing the Probe Disk(s) button. The activity light on selected disks will pulse, allowing visual verification that the correct disk drives are selected. This procedure will continue until you click the Stop button.
2. After you have verified that the correct disk devices are selected, press the Label button. A confirmation screen appears asking if you are sure you want to proceed.
3. Click OK to continue.

4. A properties screen for each disk appears, one at a time. This screen allows you to name the disk and assign the configured number of sectors to use on the disk.

   

5. Enter the following fields:
   • New Disk Label: The label you want to give the disk.

   • New Sectors: The number in 512-byte sectors you will use in the DiskType configuration during file system configuration.

   Normally you will use the default number of new sectors provided by the tool. However, some disks must be configured smaller than their actual size. For example, MPIRE video disks must be under-configured to eliminate using the last zone of the disk.

6. Click Create Label to commit the label to the disk device. If more than one disk was selected, a properties screen for the next device will appear until all of the selected devices are completed. If you click Skip Disk, then you proceed to the next selected disk.

To map a StorNext file system to a folder or drive letter, double-click the desired file system (or select it and click the Map Drive icon or Tools >Map Drive). The Client Properties screen appears.

Use the Mount Point tab to specify drive mappings. The table below describes the fields on the Mount Point tab.

If your file systems are not displayed, check the status bar at the bottom. The most common problems are:

• An incorrect Name Server Configuration.
• Network problems.
• The file system is not running.
• The StorNext Services are not running.

StorNext file systems can be mapped to a drive letter or to a folder. When mapping to a folder, the following conditions must be met:

• The folder must be empty or non-existent.
• The folder must exist on an NTFS file system volume, for example: C:\Mount\MySnfs.
• The NTFS volume must be a local volume. In other words, StorNext cannot be mounted in a folder on a Cluster Shared Volume.

Note: Verify the fsnameservers configuration is the same for all clients on the SAN. An incorrect or incomplete fsnameservers configuration may prevent the client from connecting to the file system.

Field / Button	Description
Map to Drive Letter	Select Map to Drive Letter to map the drive to a specific drive letter.
Drive (Letter)	Select the desired drive letter.
Map to Directory	Instead of selecting Map to Drive Letter, select Map to Directory. Enter a directory path, or click Browse to navigate to the directory path.

Note: If this is a LAN client or gateway, be sure to enter the parameters on the Distributed LAN tab (see Configure a LAN Client and a Gateway Server).

Select the file system you want to unmap and then click the Unmap Drive icon or select Unmap Drive from the Tools menu. You must close all applications (included Windows Explorer) which might be using the file system. If the file system is busy, you will not be allowed to unmap the drive.

Note: In order to unmap a drive, you must have Administrator rights on the local computer, and you must have read/write access to root of the StorNext file system.

Once a file system is mapped, double-click the file system to change the map. Alternatively, select the file system and click the Properties button, or select the file system and click Tools > Edit Drive Mapping. This opens the Properties window where you can change drive mapping. See Map a Drive.

Click Edit Name Servers icon or choose Configure Name Servers from the Tools menu to edit, add or remove a file system name server. See Step 2: Configure a File System Name Server.

To configure a StorNext LAN client and a gateway server, double-click the desired file system (or select it and click the Properties icon). The Properties dialog box appears.

Note: Do not enable gateway functionality for MDCs, connected to Lattus/ActiveScale systems.

Use the Distributed LAN tab to enable and configure StorNext LAN clients and gateway servers for a file system.

The Enable Client and Enable Server radio buttons determine whether the system is a LAN client or gateway Server. Note that separate licensing is required for LAN clients.

StorNext LAN clients provide the same functionality as StorNext SAN clients but do not need to be connected directly to the SAN. They instead send I/O via the TCP/IP network through a gateway server - a StorNext SAN client enabled as a gateway server. Metadata is sent over the TCP/IP network directly to the File System Metadata Controller (Server/MDC).

LAN Clients request the location of gateway servers via the Name Server.

• Gateway Server: A gateway server has direct access to data disks (using fibre channel) and makes the shared storage pool available to distributed LAN clients over a network.
• LAN Client: A StorNext LAN client does not have direct access to data disks and instead accesses the shared storage pool by connecting to a gateway server over a network. (LAN clients have full StorNext client functionality.)

Note: A StorNext SAN client configured as a gateway server requires a dedicated system. Do not run other applications or services on a system configured as a gateway server.

The table below describes the fields on the Distributed LAN tab.

Field / Button	Description
Disable	Select this option to disable the StorNext client as a StorNext LAN client or gateway server.
Enable Client	Select to configure the StorNext client as a LAN client. The StorNext client will connect to all available gateway servers. (If you select this check box, all other fields on the tab become unavailable.)
Enable Server	Select to configure the StorNext SAN client as a gateway server. The StorNext client will make the disks for this file system available to LAN clients over the specified LAN.
Read Timeout (sec)	Specify how long the LAN client will wait for a read operation to complete before retrying it on a different gateway server.
Write Timeout (sec)	Specify how long the LAN client will wait for a write operation to complete before retrying it on a different gateway server.
Number of Transfer Buffers	Specify the number of socket transfer buffers used for LAN client I/O.
Transfer Buffer Size (kb)	Specify the size in kilobytes of the socket transfer buffers used for LAN client I/O.
TCP Window Size (kb)	Specify the size in kilobytes of the TCP window used for LAN client I/O connections.
Max Threads	Specify the number of kernel threads that will be used to service LAN client I/O requests.
Server Interfaces	To complete gateway server configuration, select one or more network interfaces to be used for LAN client traffic.

From the Client Configuration dialog box, click Tools Global Options. The Global Client Options window appears.

Select the level of logging you want to receive and whether you want to display critical events on your desktop. Log information is available in the Windows Event Viewer.

Field / Button	Description
Event Log Level	Controls how many messages are inserted into the Windows Event Viewer. Critical provides the fewest messages; Debug provides the most. Each level includes all the messages in the levels listed above it.
Display Critical Events to Desk Top	Enables a notification of critical events to be sent to work station’s desktop in a message box. If this is not desired, clear the check box.

The Mount Options tab displays the mount options for the drive currently selected on the Drive Mappings tab. The table below describes the fields on the Distributed LAN tab.

Caution: Changing the values on the Mount Options tab can affect system performance and stability. Do not change mount options unless instructed to do so by the Quantum Technical Assistance Center.

Field / Button		Description
Mount Control	Mount Retransmit Limit	Specify the number of times the driver will re-transmit a message to the FSM. After a successful connection, this value is no longer used. The default is 1.
	Allow Diskless Mount	When this box is checked, the file system can be mounted and accessed without all the disks being accessible in the file system stripe groups. In this mode, file metadata can be viewed and changed, but no data can be accessed. The default is to not allow a file system to be mounted unless all disks are accessible.
	Read Only	When this box is checked, the file system is mounted in read-only mode. The default is off or not checked.
	Restrict Pre-allocation API	When set to yes, non-administrator users are unable to use the preallocation ioctl.
	31-bit Readdir Offset	When this option is enabled, you force the directory offsets to fit into 31 bits. Note: Enable this option only when a problem has been identified with using the full size of the struct d_off field from readdir(2) or related system calls.
	Windows Illegal Filename Support (Previously: Apple SFM Filename Support)	If this box is checked, filenames that Windows considers illegal due to having certain reserved characters or having a space or period at the end will have the offending characters mapped to Unicode Private Use Area code points with the method used by the Microsoft Windows feature Apple Services For Macintosh ®. Note: Before you enable the Windows Illegal Filename Support option, read the section StorNext File Name Considerations in the StorNext 6 User's Guide to understand the system wide ramification of using this option.
Threads	Number of Async I/O Threads	Specify the number of threads created to be used as asynchronous I/O threads for user applications. The default is 8. The allowed range is 4 to 32.
	Number of System Threads	Specify the number of threads created for use by the file system. The default value is 16.
Timeouts	Message Timeout x 1/10th Sec.	Specify (in tenths of a second) the amount of time before a message to the FSM is timed out. The default is 50 (five seconds).
	Message Retry Count	Specify the number of attempts to be made for sending a message to the File System Service. The default is 12.
	Retry I/Os Forever or Allow I/O Timeouts	Choose either Retry I/Os Forever or Allow I/O Timeouts, depending on whether you want to allow timeouts or keep trying I/O. The default value is to Retry I/Os Forever.
	I/O Retry Time Seconds	When you choose Allow I/O Timouts, this option controls the I/O retry behavior. This parameter establishes the amount of time that may elapse during an I/O retry sequence. An I/O retry sequence consists of the following: Retry an I/O request across all available paths that are currently present. Compare the current time to the Instantiation time of the I/O request, if at least <n> seconds have elapsed, return the I/O request in error, otherwise reset the paths used, and retry again.
	I/O Penalty TIme Seconds	This option controls the Multi-Path I/O penalty value, where <n> is expressed in seconds with a minimum value of 1 and a maximum value of 15. This parameter establishes the amount of time a Path_In_Error will be bypassed in favor of an Operational Path during a Multi-Path selection sequence. If all paths are currently in the Path_In_Error state, the first available path will be selected, independent of the Path_In_Error state. The default value is 5 seconds.
	Fast Failover Detection	When this box is checked, the client uses a more aggressive approach to detecting if the FSM has failed. With this option on, the client monitors the FSM heartbeat. If no heartbeat is detected within three (3) seconds, a failover request is initiated. This option is desirable for near realtime activities that cannot sustain more than 10 seconds of access loss to the server. Quantum does not recommend enabling this option for normal file system operations.
	Hard Reconnect	When this box is checked, the file system attempts to reconnect to the FSM forever. If this option is not enabled, the file system attempts to reconnect to the FSM for the number of times specified at the Mount Retransmit Limit field before failing the request. The default value is off.
Quality of Service (QOS)	Token Hold Seconds	The QOS Token Hold Time parameter is applicable only when using the StorNext Quality of Service (QOS) feature for real-time IO. This parameter determines the number of seconds a client stripe group holds on to a non-realtime I/O token during periods of inactivity. If no I/O is performed on a stripe group within the specified number of seconds, the token is released back to the FSM. The default value is 60 seconds. The parameter should be specified in five-second increments; if the parameter is not a multiple of five, it will be rounded up automatically.

The Data Buffer Cache keeps the file system data in memory on the local computer to speed up performance for small I/O operations.

The Advanced Cache Options tab displays performance values that control how many file system lookup names are kept in memory.

Caution: Changing the values on the Advanced Cache Options tab can affect system performance and stability. Do not change cache parameters unless instructed to do so by the Quantum Technical Support.

Field / Button		Description
Data Buffer Cache	Enable Data Buffer Cache	When this box is not checked, the file system will not buffer any data. All files will be read directly into the application's memory using DMA. Requests that are not properly aligned will be read into temporary buffers, then copied to the application's buffer. If Buffer Cache is disabled, the remaining Data Buffer Cache options are ignored.
	Individual Buffer Size	This option sets the size of each cache buffer. This determines the I/O transfer size used for the buffer cache. To determine optimal performance, try different sizes or contact your RAID vendor. This size must be divisible by the file system block size. The maximum value allowed is 512K and the minimum value allowed is the file system block size. The value default is 64K.
	Minimum Total Cache Size	This value controls the amount of memory used to cache data from the file system. This parameter is shared by all file systems with the same block size.
	Auto-DMA Read/Write Sizes	Buffer Cache Auto DMA Read Length and Buffer Cache Auto DMA Write Length control the minimum I/O size for DMA transfers. That is, any smaller transfer will always go through the buffer cache. The default value is 1MB.
	Number of Read-ahead Buffers	This option controls the size of the read-ahead window used by the buffer cache. The default value is 16 buffers with a maximum of 100. Using a value of 0 disables read-ahead.
	Number of Threads	This option controls the number of dedicated background threads used by the buffer cache for performing I/O. The default value is 8, with a minimum of 1 and a maximum of 100. Using a larger value can increase I/O concurrency in the buffer cache and therefore improve performance.
Attribute Flush Time	Seconds for Shared/ Non-Shared	The Attribute Flush Time parameters control the length of time attributes are held on the client before they are flushed back to the FSM (unless there is an explicit attribute request from the FSM). The default values are 30 seconds for non-shared files (Attribute Flush Time, non shared), and 2 seconds for shared files (Attribute Flush Time, shared). Setting these parameters lower will greatly increase the amount of metadata traffic between clients and the FSM. However, in circumstances where files are frequently shared on the SAN, setting the Attribute Flush Time Shared can result in other clients seeing size updates more frequently if a file is being written on one client and read on another. A value of zero is invalid, and will result in using the default setting.
	Delay Atime Updates	When this box is checked, the file system delays Atime (access time) updates when reading a file to the time when the file is closed. This cuts down on FSM metadata updates at the expense of coherency.
Metadata/Inode Cache	Low Water Mark	A metadata/inode cache contains non-data information such as file names, sizes, update times, and so on. Tuning the low and high water marks and the frequency of purge passes can help certain large mix applications.
	High Water Mark
	Max. Entries
	Purge Period (Seconds)
Directory Cache	Minimum Directory Cache Size	This option sets the size of the directory cache. Directory entries are cached on the client to reduce client-FSM communications during directory reads. The default value is 10 MB.

You can access all of the configuration utilities, along with several others, from the Windows Start menu.

To run a configuration utility from the Windows Start menu, click Start > All Programs > StorNext File System, and then click one of the available configuration utilities (see Available Configuration Utilities).

As soon as you finish installing StorNext, the StorNext Installation window remains open. If you wish to begin configuring immediately, click the Configure StorNext button to open the StorNext Configuration window.

You can return to the StorNext Configuration window at any time by double-clicking the file named SnfsSetup32.exe (32-bit systems) or SnfsSetup64.exe (64-bit systems) and then clicking the Configure StorNext button.

The StorNext Configuration window provides buttons to access several of the most common configuration utilities:

• Name Servers, see Step 2: Configure a File System Name Server.
• Label Disk Drives, see Step 3: Label a Disk Drive.
• Import/Export Client Settings, see Configure the StorNext Client Software on Windows.
• Client Configuration, see Step 5: Configure a Client.

Use this utility to view and modify properties for the StorNext client software. See Step 5: Configure a Client.

Formats a hard disk so it can be used by StorNext. See Step 3: Label a Disk Drive.

Allows you to configure StorNext file systems. This tool provides access to advanced features of StorNext File Systems. It is assumed that you are familiar with individual features available in the File System Cfg File (.cfg). See Step 4: Configure a Server (Advanced).

The File System Startup List utility lets you modify the File System Manager (FSM) services list and set file system priority. You can check the StorNext file system health status while the file system is active. You can note changes but not commit them in read-only mode. You can also list all of the existing files and their pertinent statistics, such as inode number, size, file type and location in the file system

The File System Manager is a process that manages the name space, allocations, and metadata coherency for a file system. Each file system uses its own FSM process. When there are multiple file systems (and therefore multiple FSM processes), the FSM services list controls which FSM processes are run when the server starts up, and also sets the priority for each file system (for failover configurations).

To run the File System Startup List utility, on the Windows Start menu, click All Programs > StorNext File System > File System Startup List. The File System Startup Editor appears.

Select a file system do any of the following. When finished making changes, select File > Save to save your changes.

Action	Description
Action Toggle Startup Type	Allows you to choose if the file system will start up automatically upon server startup. This action toggles the startup type between automatic and manual.
Action Priority	(Optional) Select the priority for the selected file system. This priority is used for failover configurations. 0 is highest priority and 9 is lowest priority.

The File System Check (Repair) utility allows you to repair corrupted metadata on a file system. You can also list all of the existing files and their pertinent statistics, such as inode number, size, file type and location in the file system. Repair a file system if errors were identified when checking the file system (see The File System Check (Read-Only) Utility).

The file system must be inactive in order to be repaired. To stop a file system, see The Stop File System Services Utility.

To repair a file system, on the Windows Start menu, click All Programs > StorNext File System > File System Check (Repair). Type the number that corresponds to the file system you want to repair, and then press Enter.

Note: Multiple repair passes may be needed to fully fix a damaged file system. Run the repair utility repeatedly until no problems are reported by the utility.

The File System Check (Read-Only) utility allows you to check a StorNext file system for metadata corruption (due to a system crash, bad disk, or other failure). Run the utility on an MDC that contains the file system you want to check.

To check a file system, on the Windows Start menu, click All Programs > StorNext File System > File System Check (Read-Only). Type the number that corresponds to the file system you want to check, and then press Enter.

Because the file system check is run in read-only mode, any problems that exist are not repaired. If the utility identifies errors or corruption in metadata, you must repair the file system (see The File System Check (Repair) Utility).

The Re-initialize a File System utility allows you to re-initialize an existing file system or initialize a file system for the first time. Initializing a file system prepares it for use.

Caution: Use extreme caution when using this tool. This will destroy all data on the selected file system.

To initialize a file system, on the Windows Start menu, click All Programs > StorNext File System > Re-initialize a File System. Type the number that corresponds to the file system you want to re-initialize, and then press Enter.

Use the License Identifier utility to display the host license identifier. The host license identifier is required to obtain a permanent license for StorNext.

To run the License Identifier utility, on the Windows Start menu, click All Programs > StorNext File System > License Identifier. A dialog box displays the host license identifier. Record this information.

Allows you to import StorNext licenses. See Step 1: Obtain and Install a StorNext License.

Specifies the name server(s) used by StorNext File System services. See Edit a Drive Map.

The Server Administration utility allows you to look at the current status of file systems and to start, stop and perform basic file system administration tasks (similar to the CLI command, cvadmin).

Note: A stripe group is a logical storage unit made up of one or more disks. A quota is a space limit that is set for specified users or groups.

To run the Server Administration utility, on the Windows Start menu, click All Programs > StorNext File System > Server Administration. The StorNext Administration window appears.

In the StorNext Administration window, you can perform the following procedures.

The Start File System Services utility starts all StorNext services on an MDC or StorNext client.

The StorNext services must be running on the MDC for file systems to be active and available. In addition, the StorNext services must be running to use the StorNext configuration utilities and to mount file systems using the client software.

To start StorNext File System services, on the Windows Start menu, click All Programs > StorNext File System > Services Start.

The Stop File System Services utility stops all StorNext services on an MDC or StorNext client.

To stop StorNext File System services, on the Windows Start menu, click All Programs StorNext File System Services Stop.

To start the StorNext services again, reboot the system or use the Start File System Services utility. For more information, see The Start File System Services Utility.

The Stop and Remove File System Services utility stops all StorNext services on an MDC or StorNext client, and also removes registry entries that automatically start the services on bootup.

To stop and remove StorNext File System services, on the Windows Start menu, click All Programs > StorNext File System > Services Stop and Remove.

To start the StorNext services again, you must use the Start File System Services utility. Rebooting the system will not restart services. For more information, see The Start File System Services Utility.

View StorNext help documentation for utilities and other commands.

The Version Information utility displays information about the currently installed version of the StorNext server and/or client software, such as the version number, build number, and platform.

To run the Version Information utility, on the Windows Start menu, click All Programs > StorNext File System > Version Information. A dialog box displays version information for the StorNext server and/or client software installed on your system.

To start a file system, perform the following procedure.

1. Right-click File Systems, and then click Start. The File System Control dialog displayed.
2. Enter the file system name and the IP address of the MDC.
   • The File System Name is the name of a file system configuration file without the .cfg/.cfgx file extension.
   • The Meta-data Controller (MDC) Host or IP is the hostname or IP address of the MDC managing the specified file system.
   • If Start a Single File System Manager is checked, this will start a single FSM on the specified host. If it is unchecked, it will start FSMs on both HA (High Availability) MDCs if they are an HA pair. Optionally, you may have the dialog wait for the file system to start before returning. Otherwise the request will be issued and return immediately.

   

Once the file system is started, the file system status is displayed.

• A yellow dot indicates the file system is in the standby state.
• A green arrow indicates the file system is in the active state.

Once the file system is started, perform the following procedure to activate the file system.

1. Right-click the file system, and then click Activate. The File System Control dialog is displayed with Initiate Activation Vote checked.

   Note: Initiate Activation Vote causes a client "vote" to commence and might cause a file system to activate. If an FSM is already active, no action is taken.

2. Click OK to activate.

   

   

   If the file system activates successfully, the File System Control status is updated to display the following.

   

Other radio buttons in the File System Control specify the following parameters:

• The Stop File System radio button is used to stop a single FSM or to stop both FSMs, if they are HA pairs. As with the Start File System option, you can have the dialog wait for the command to complete before return control back to you.
• The Fialover option can be used on a HA MDC. This radio button will cause the file system to fail-over from the active FSM to the standby FSM (regardless of which MDC host is specified).

You can select a file system to display clients, debug options, quality of service, quotas and stripe groups. The table below provides the description of the various fields in the File System Properties display.

Name	Value	Type
Clients		Expandable list of connects to the file system (clients with file system mounts and control connections) and the client properties.
Debug	None	Click to expand to a clickable list of debug flags.
Quality Of Service	None	Click to display QOS properties (if QOS is enabled on file system.)
Quotas	None	Click to display Quotas properties (if Quotas are enabled on file system.)
Stripe Groups	None	Expandable list of stripe groups and stripe group properties.
Host	IP address of the MDC running the file system.
Percent Free	Percentage of free space on the file system.
Size	Size of the file system
State	Current state of the file system.

To view information about a client connected to the file system, expand a file system in the left pane, and then click Clients. Information about the clients currently connected appears in the right pane.

Click on a specific client to see the client’s properties.

Select a specific Client to display the following information.

Name	Value
Build	StorNext version
DLAN Client	Is it a Distributed LAN Client?
DLAN Server	Is it a Distributed LAN Gateway?
Expires	When the license expires
Gateway License	Distributed LAN Gateway license installed
Hashed ID	SNFS Identifier hash value
ID	ID or IP address
IO Test Last	Last IO Test result
IO Test Rate	IO Test rate
IP Address	Address of connection
Local Address	Alternate local address
Nbr CPUs	CPU count on Client
Ordinal	FSM Connection number
Reconnect Cnt	Number of reconnections
Type	Type of connection
Uptime	Connection time

Click the Debug icon to display the current active debug flags used by the File System Manager (FSM) process. If any of the debug flags are turned on, the debug output is printed to the file:

Caution: If you enable debug flags, this might severely impact file system performance. Do not enable debug flags unless recommended by Quantum.

The Quality of Service (QOS) pane displays the settings and current metrics. Quality of Service must be enabled on the file system for it to be active. See Quality of Service for additional details.

Quotas define the amount of storage space a specified user or group is allowed to own. You can set hard or soft quota limits. Quotas must be enabled in the File System Configuration file to be able to set and change quotas.

• To view quota properties, expand a file system in the left pane, expand Quotas and then click Directories or Users & Groups. The User/Group Quota dialog box appears
• To change quotas, right-click on Directories or Users & Groups. The User/Group Quota dialog box appears

There are three types of quotas you can configure:

• Set quotas for users on the User Quotas button.
• Set quotas for groups on the Group Quotas button.
• Set data or file quotas for directories under the Directory Quotas heading.

Field / Button		Description
Quota Type	User Quota	Type the name of the user for which you want to set a quota.
	Group Quota	Type the name of the group for which you want to set a quota.
	Directory Quotas	Data Limit: Set a data size limit on the directory. File Count Limit: Set a limit on the number of files under a directory. Directory: Specify the directory to apply the quotas to.
Data Limit	Hard Limit	Specify an amount in bytes or with the extensions M (megabytes), G (gigabytes) or T (terabytes). This is the maximum amount of space the specified user or group can use.
	Soft Limit	Specify an amount in bytes or with the extensions M (megabytes), G (gigabytes) or T (terabytes). Once the user or group exceeds this limit, a warning is sent. Note: Typically, this is set at 80% of the hard limit.
Time Limit		Specify the amount of time it takes for the soft limit to turn into a hard limit.

Field / Button	Description
Name	The Linux user or group name
Type	The type of quota (User or Group)
Limit Hard	The absolute maximum amount of data the user or group can consume
Limit Soft	The maximum amount of data the user or group can consume. They can exceed this limit for Grace Period amount of time, but cannot exceed the Hard Limit.
Used	The amount of data currently consumed.
Grace Period	The amount of time the user or group is allowed to exceed the Soft Limit
Time Remaining	Amount of time remaining before the user or group cannot allocate any more space in the file system. If the value is negative, the user can no longer allocate any more space.

To view stripe group properties, expand a file system in the left pane, click Stripe Groups, and then click the stripe group name in the left pane. The stripe group’s property appears in the right pane. The table below describes the fields of the stripe group property display.

Name	Value
Affinity Cnt	Number of affinities
Blocks: Free	Number of blocks free
Blocks: Reserved	Number of blocks reserved
Blocks: Total	Total number of blocks
Stripe Breadth	The number of file system blocks to write before switching to the next disk in the stripe group.
Stripe Depth	The number of disks in the stripe group.
Device Flags	Read and Write flags
Exclusive	Indicates if only specified file types (associated with the stripe group affinities) can be stored on the stripe group.
Index	Disk index in configuration
Journal	Indicates if the file system logging journal can be stored on the stripe group.
Metadata	Indicates if file system metadata can be stored on the stripe group.
Multi-path	Indicates the method the file system uses to access the disk: round, static, or sticky.
Name	Stripe group name
Nbr of Disks	Number of disks in group
Ordinal	Internal index
Realtime	Uses Real-time IO
Status	Current status

Click Disks to see all disks visible to the currently selected host. Click a specific disk to display the various attributes of that disk.

Name	Value
Controller	Device driver
Device (Block)	The block device
Device (Raw)	The Raw Device
HBA ID	Host Bus Adapter identifier
Inquiry	Manufacturer string
LUN ID	Logical Unit Number
Name	Disk Label
Serial Nbr	Disk's Serial Number
Size	Size of the disk
State	State of the disk