Hardware manual

Group Administration Basic volume operations
9–14
Modifying volume permission
A volume can have read-write or read-only permission, unless it is a template volume.
Requirement: To
change a volume permission to read-only, you must first set the volume offline.
Restriction: Yo
u cannot set a template volume to read-write permission.
To modify a volume permission:
1. Click
Volumes in the lower-left panel, then expand Volumes in the far-left tree, then select the volume name,
and then click
Set access type.
2. In the Set Access Type dialog box, change the permission.
3. Click
OK.
Allowing or disallowing multi-host volume access
In a shared storage environment, you must control computer access to iSCSI targets (volumes and snapshots),
because multiple computers writing to a target in an uncoordinated manner might result in volume corruption.
You can allow or disallow multi-host (shared) access to a volume. If you disallow multi-host access to a volume,
only one
iSCSI qualified name (IQN) can connect to the volume at one time. However, if you have a certain
environment, you might want to allow multi-host access to a volume. See Multi-host access to targets.
Requirement: Before di
sallowing multi-host access to a volume, disconnect all initiators from the volume except
one, unless the initiators have the same IQN. If multiple initiators with different IQNs have
connections to the volume, you cannot disallow multi-host access.
To allow or disallow multi-host access to a volume:
1. Click
Volumes in the lower-left panel, then expand Volumes in the far-left tree, then select the volume name,
and then click
Set access type.
2. In the Set Access Type dialog box, allow or disallow multi-host access.
3. Click
OK.
Enabling or disabling iSNS discovery
You can configure a PS Series group to use an iSNS (Internet Storage Name Service) server, which facilitates the
discovery of iSCSI targets in the group. See Configuring the group to use an iSNS server.
By default, the group disables automatic discovery of targets by
iSNS servers. If you want an iSNS server to
automatically discover a group target, you must enable this functionality on the target.
Requirement: A grou
p disables automatic discovery of group targets by iSNS servers only if all the group
members are running PS Series Firmware Version 4.1.4 or a higher version. If a member is
running a previous firmware version (for example, if you downgrade a member from V4.1.4),
iSNS servers can automatically discover all group targets.