2.2. Creating iSCSI Targets

Note

  1. Each iSCSI target must be assigned at least one unique IP address from DC network’s static pool.
  2. The name of each iSCSI target must be unique in the Acronis Storage cluster.
  3. Acronis Storage iSCSI targets support persistent reservations to allow iSCSI initiators obtain exclusive access to the specified target’s LUNs.

To create a target test1 with the size of 100 GB, the LUN of 1, and the IP address of 192.168.10.100, execute the following commands:

# vstorage-iscsi create -n test1 -a 192.168.10.100
IQN: iqn.2014-04.com.vstorage:test1
# vstorage-iscsi lun-add -t iqn.2014-04.com.vstorage:test1 -l 1 -s 100G
# vstorage-iscsi start -t iqn.2014-04.com.vstorage:test1

Note

  1. If you need to change target’s IP address, stop the target as described in Stopping iSCSI Targets, then run the command vstorage-iscsi set -t <target_name> -a <new_IP_address>.
  2. If you need to increase the size of a LUN, stop the target as described in Stopping iSCSI Targets, then run the command vstorage-iscsi lun-grow -t <target_name> -l <lun_ID> -s <new_size>.

To check that the target is up, run the vstorage-iscsi list command with the target’s name as the option. For example:

# vstorage-iscsi list -t iqn.2014-04.com.vstorage:test1
Target iqn.2014-04.com.vstorage:test1:
 Portals:     192.168.10.100
 Status:      running
 Registered:  yes
 Host:        fefacc38a2f140ca
 LUN:   1, Size:  102400M, Used:     1M, Online: Yes

For information about the command output, see Listing iSCSI Targets.

iSCSI initiators can now access the target iqn.2014-04.com.vstorage:test1 via the portal 192.168.10.100.

2.2.1. Performance Tips

  • Spread iSCSI targets evenly across nodes in the cluster. For example, ten nodes with one iSCSI target per each will perform better than a single node with ten iSCSI targets on it.
  • Fewer LUNs per more iSCSI targets will perform better than more LUNs per fewer iSCSI targets.
Jan 15, 2019
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