Replication Configuration

The Target DXis list displays the following information for each target DXi :

You can customize the appearance of the DXis list in the following ways:

• Click the top banner row of the list to collapse or expand the list.
• Click the arrow to the right of a column heading and select Sort Ascending or Sort Descending to sort the rows in the table by that column.
• To show or hide a column, click the arrow to the right of a column heading, and then click Columns. Select the check box to show a column, or clear the check box to hide a column.

Note: The statistics in the Target DXis list are for each target DXi rather than a cumulative total for all targets as is displayed on the Home page.

Add a replication target to configure the DXi6900 to send replicated data to that target. You can add up to two targets. After you add a target, you can enable replication to that target for a NAS share or VTL partition. When replication is enabled for a share or partition, replicated data is sent to the target system during scheduled or manual replication.

To add a replication target:

1. Under Target DXis, click Add.

   The Add Target Host window displays (see Figure 2).

   Figure 2: Add Target Host

   

2. In the Target Hostname or IP box, enter the hostname or IP address of the system that will receive the replicated data.

   Additional Information

   • When entering IP addresses, never use an address that is in a reserved IP address range. To see a list of reserved IP address ranges, click the quick tip icon [?] located near the IP address field.

   • To use hostname format, you must specify at least one DNS IP address on the Network page (see Network).

3. In the Encryption drop-down box, select the type of encryption to use when sending replication data to the target system (None, 128‑bit, 256-bit, or TLS with AES 256).

   Important Information

   • AES encryption options are available only if the Data-in-Flight license is installed (see License Keys).
   • If TLS with AES 256 is selected, the factory installed certificates are inadequate for security. The factory installed certificates should be considered public domain and are provided only for convenience. You must install new certificates for secure encryption.
   • TLS with AES 256 must be enabled for this encryption option to appear (see Data Encryption).

   Caution: For encryption, select None or 128-bit if you are sending data to a DXi running a system software version prior to DXi 2.1 Software.

4. In the Source IP box, enter the IP address that is used to uniquely identify the source DXi to the target. This may be different than the actual network IP address of the source DXi .

   If the target system is at DXi 2.1 Software or higher, the Source IP field is not required. If the target system is at DXi 2.0.1.x Software or below, then you must enter the IP address by which the target system recognizes the source system. The default value is 0.0.0.0.

   Additional Information

   • The Source IP field does not accept fully qualified domain names. You must enter a valid IP address. Make sure this IP address is configured in the allowable sources list on the target DXi .

   • When configuring segmented network interfaces, if the source DXi replication, data, and management interfaces are on the same subnet, you must add a host route on the source DXi to make sure the replication interface is correctly selected when replicating data to the target DXi (see Understanding Interface Routing).
5. Click Apply.

Note: The new target is not automatically added to existing replication schedules. You must add or edit scheduled events to schedule replication to the new target (see Scheduler).

Edit a replication target to change encryption options or the source IP address.

To edit a replication target:

1. Under Target DXis, select the target and click Pause to pause replication.

2. Select the target again and click Edit.

   The Edit Target Host window displays (see Figure 3).

   Note: If you are editing a target, you cannot change the Target Hostname or IP.

   Figure 3: Edit Target Host

   

3. In the Encryption drop-down box, select the type of encryption to use when sending replication data to the target system (None, 128‑bit, 256-bit, or TLS with AES 256).

   Important Information

   • AES encryption options are available only if the Data-in-Flight license is installed (see License Keys).
   • If TLS with AES 256 is selected, the factory installed certificates are inadequate for security. The factory installed certificates should be considered public domain and are provided only for convenience. You must install new certificates for secure encryption.
   • TLS with AES 256 must be enabled for this encryption option to appear (see Data Encryption).

   Caution: For encryption, select None or 128-bit if you are sending data to a DXi running a system software version prior to DXi 2.1 Software.

4. In the Source IP Address box, enter the IP address that is used to uniquely identify the source DXi to the target. This may be different than the actual network IP address of the source DXi .

   If the target system is at DXi 2.1 Software or higher, the Source IP Address field is not required. If the target system is at DXi 2.0.1.x Software or below, then you must enter the IP address by which the target system recognizes the source system. The default value is 0.0.0.0.

   Additional Information

   • The Source IP Address field does not accept fully qualified domain names. You must enter a valid IP address. Make sure this IP address is configured in the allowable sources list on the target DXi .

   • When configuring segmented network interfaces, if the source DXi replication, data, and management interfaces are on the same subnet, you must add a host route on the source DXi to make sure the replication interface is correctly selected when replicating data to the target DXi (see Understanding Interface Routing).
5. Click Apply.
6. Under Target DXis, select the target and click Resume to pause replication.

Delete a replication target if the DXi6900 no longer needs to send replicated data to that target. After the target system is deleted, the DXi6900 will no longer send replicated data to that system.

When a target is deleted:

• All replication jobs to that target that are in progress or queued will transition to failed.
• All replication job history for that combination of target and share or partition is removed.
• All share or partition will be reconfigured to no longer replicate to that target.

To delete a replication target:

1. Under Target DXis, select one or more targets to delete.
2. Click Pause to pause replication to the target.
3. Click Delete.

Note: The deleted target is not automatically removed from existing replication schedules. You must edit scheduled events to remove the deleted target (see Scheduler).

The source DXi controls the replication pause behavior.

• To pause replication, select a target under Target DXis and click Pause. The DXi temporarily stops sending replicated data to the selected target.
• To resume replication, select a target under Target DXis and click Resume. The DXi resumes sending replicated data to the selected target.

Enable system throttling to limit the network bandwidth used for replication to all targets. When a constant throttle is enabled, the DXi limits the amount of data it sends during source replication so that it does not exceed the specified bandwidth.

To enable system replication throttling:

1. Under Target DXis, click the box next to Throttling.

   The Replication Throttle window displays (see Figure 4).

   Figure 4: Replication Throttle

   

2. Select the Enable system throttling check box, or clear the check box to disable system throttling.
3. In the Throttle box, enter the maximum allowed bandwidth, and select the units you want to use to specify the constant throttle
   (KB/s or MB/s). The lowest value you can set is 32 KB/s. The lowest value you can set is 32 KB/s. The highest value you can set is 125 MB/s for 1GbE and 500 MB/s for 10GbE.
4. Click Apply.

Caution: Do not set the maximum allowed bandwidth to a value that is lower than necessary. If the maximum allowed bandwidth is set to the lowest value, large replication jobs may fail.

The Source DXis list displays the following information for each source DXi :

You can customize the appearance of the Source DXis list in the following ways:

• Click the top banner row of the list to collapse or expand the list.
• Click the arrow to the right of a column heading and select Sort Ascending or Sort Descending to sort the rows in the table by that column.
• To show or hide a column, click the arrow to the right of a column heading, and then click Columns. Select the check box to show a column, or clear the check box to hide a column.

Note: The statistics in the Source DXis list are for each source DXi rather than a cumulative total for all sources as is displayed on the Home page.

Add a system to the list of replication sources to allow it to send replicated data to the DXi6900. You must add a source system to the list of allowed replication sources on the target DXi before you configure the source DXi to send replicated data to the target. The DXi can receive replicated data fromup to 10 sources.

To add a replication source:

1. Under Source DXis, click Add.

   The Add Allowed Source window displays (see Figure 5).

   Figure 5: Add Allowed Source

   

2. In the Source Hostname or IP box, enter the hostname or IP address of the system that will send the replicated data to the DXi6900.

   Note: To use hostname format, you must specify at least one DNS IP address on the Network page (see Network).

3. Click Apply.

Delete a system from the list of replication sources if it will no longer send replicated data to the DXi6900. After the source system is deleted, the DXi6900 will no longer accept replicated data from that system.

To delete a replication source:

1. Under Source DXis, select one or more sources to delete.
2. Click Delete.

Note: If a source DXi is deleted from the list, its contribution to the cumulative totals on the Home page are not removed until you clear Receive statistics (see Replication Performance).

During scheduled or manual data replication, the DXi6900 receives a snapshot from the source system. A snapshot contains all of the data necessary to fully recover or failback a NAS share or VTL partition to the point in time when the snapshot was saved.

The DXi6900 can retain up to 32 snapshots for each replicated share or partition. Once the maximum number of snapshots have been saved, the oldest snapshot is deleted to make room for each new snapshot that is received.

To change the maximum number of received snapshots:

• Under Source DXis, in the Maximum Snapshots drop-down box, select the number of snapshots to retain for each replicated share or partition.
• The default value is 10. The maximum value is 32.

Note: Retaining more than the default number of snapshots will use additional disk space on the target DXi . This can cause the target DXi to fill up more quickly.