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7.4. Managing iSCSI volumes¶

This section describes how to create and manage volumes to be exported via iSCSI.

7.4.1. Creating iSCSI volumes¶

To create a volume, use the vstorage-target vol-create command. For example:

# vstorage-target vol-create -name vol1 -size 1G \
-vstorage-attr "replicas=3:2 failure-domain=host tier=0"
{
  "Id": "3277153b-5296-49c5-9b66-4c200ddb343d"
}

This command creates a 1 GB volume named vol1 on storage tier 0 with 3:2 replication and host as failure domain.

7.4.2. Listing and printing details of iSCSI volumes¶

To list volumes, use the vstorage-target vol-list command. For example:

# vstorage-target vol-list
[
  "3277153b-5296-49c5-9b66-4c200ddb343d",
  "a12110d5-cbbc-498a-acdd-a8567286f927",
  "d5cc3c13-cfb4-4890-a20d-fb80e2a56278"
]

Use vstorage-target vol-stat -all to print details of all volumes. To print details of a specific volume, run vstorage-target vol-stat -id <vol_ID>.

7.4.3. Attaching iSCSI volumes to target groups¶

To attach a volume to a target group, use the vstorage-target tg-attach command. A volume cannot be attached to multiple target groups at the same time. For example:

# vstorage-target tg-attach -id 3d8364f5-b830-4211-85af-3a19d30ebac4 \
-volume 3277153b-5296-49c5-9b66-4c200ddb343d -lun 0 -node bbfd0e7a26b1406d

This command attaches the volume with the ID 3277153b-5296-49c5-9b66-4c200ddb343d to a target group with the ID 3d8364f5-b830-4211-85af-3a19d30ebac4 as LUN 0. LUN ID numbering must start with 0. The same command sets the PREFERRED bit to the node with the ID bbfd0e7a26b1406d. The default Active/Optimized path will go via this node.

7.4.4. Setting the Active/Optimized path for iSCSI volumes¶

To set an Active/Optimized path for an iSCSI volume, use the vstorage-target vol-set command. It will only work if the specified node is STABLE.

Note

Make sure the new preferred node is reachable by the initiator.

# vstorage-target vol-set -id 3d8364f5-b830-4211-85af-3a19d30ebac4 \
-pref-node bbfd0e7a26b1406d

This command sets the Active/Optimized path for the volume with the ID 3d8364f5-b830-4211-85af-3a19d30ebac4 to the node with the ID bbfd0e7a26b1406d.

7.4.5. Viewing iSCSI volume ALUA information¶

To view the ALUA information for an iSCSI volume, use the vstorage-target vol-info command. For example:

# vstorage-target vol-info -id 3d8364f5-b830-4211-85af-3a19d30ebac4
Volume ID:      3d8364f5-b830-4211-85af-3a19d30ebac4
Name:           vol1
Size:           1073741824
Used:           1073152
Serial:         d2be0e84fd7f
Attrs:          map[]
TG:             4708b908-8c2d-444c-91b1-a1e18a96d4fc
LUN:            0

                                  *** Node #0 ***
                        -------------------------
    NodeId:                     bbfd0e7a26b1406d
     State:                               synced
      TPGs:                       vstorage_tpg_0
      ALUA:                               active
 Preferred:                                    1
      WWNs:  iqn.2014-06.com.vstorage:target1 [2]
   Portals:                         10.37.130.61

This command shows the ALUA details for the volume with the ID 3d8364f5-b830-4211-85af-3a19d30ebac4.

7.4.6. Viewing and setting iSCSI volume parameters¶

To view and set volume parameters, for example, redundancy mode, failure domain, or tier, use the commands vstorage-target vol-attr get and vstorage-target vol-attr set. For example:

# vstorage-target vol-attr get -id d5cc3c13-cfb4-4890-a20d-fb80e2a56278
{
  "chunk-size": "268435456",
  "client-ssd-cache": "1",
  "failure-domain": "host",
  "replicas": "3:2",
  "tier": "0"
}
# vstorage-target vol-attr set -id d5cc3c13-cfb4-4890-a20d-fb80e2a56278 \
-vstorage-attr "replicas=2:1 tier=1"

The first command shows the parameters of the volume with the ID d5cc3c13-cfb4-4890-a20d-fb80e2a56278. The second command sets the redundancy mode to 2 replicas and the tier to 1 for this volume.

7.4.7. Increasing iSCSI volume size¶

To increase the size of a volume, use the vstorage-target vol-grow command. For example:

# vstorage-target vol-grow -id d5cc3c13-cfb4-4890-a20d-fb80e2a56278 -size 2G

This command expands the volume with the ID d5cc3c13-cfb4-4890-a20d-fb80e2a56278 to 2 GB.

7.4.8. Setting iSCSI volume limits¶

To set read/write limits for a volume, use the vstorage-target vol-limits command. For example:

# vstorage-target vol-limits -id d5cc3c13-cfb4-4890-a20d-fb80e2a56278 -read-bps 10485760 \
-write-bps 10485760

This command sets read/write speed for the volume with the ID d5cc3c13-cfb4-4890-a20d-fb80e2a56278 to 10485760 bytes per second.

7.4.9. Detaching iSCSI volumes from target groups¶

To detach a volume from a target group, use the vstorage-target tg-detach command. LUN 0 must be detached last. For example:

# vstorage-target tg-detach -id 3d8364f5-b830-4211-85af-3a19d30ebac4 \
-volume d5cc3c13-cfb4-4890-a20d-fb80e2a56278

This command detaches the volume with the ID d5cc3c13-cfb4-4890-a20d-fb80e2a56278 from the target group with the ID 3d8364f5-b830-4211-85af-3a19d30ebac4.

7.4.10. Deleting iSCSI volumes¶

To delete a volume, use the vstorage-target vol-delete command. You cannot delete volumes attached to target groups. For example:

# vstorage-target vol-delete -id d5cc3c13-cfb4-4890-a20d-fb80e2a56278

This command deletes the volume with the ID d5cc3c13-cfb4-4890-a20d-fb80e2a56278.

Oct 06, 2020

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