Hardware manual

Group Administration Basic volume operations
9–4
Thin provisioning
settings
Con
trols whether the volume is thin-provisioned and, if so, the minimum and maximum volume
reserve and the in-use space warning limit.
The defaults are no thin provisioning and the group
-wide volume settings.
See About thin provisioning on
page 10-1.
Snapshot reserve Optional amount of space to reserve for snapshots of the volume, based on a
percentage of the volume
reserve.
The default is the group-wide snapshot reserve setting.
See Snapshot management.
iSCSI alias Name that some iSCSI initiators display. Administrators use the alias to identi
fy the iSCSI target. The
default is the group-wide volume setting.
See Modifying a volume alias on
page 9-13.
Permission Whether the volume is read-write (the
default) or read-only.
You cannot set a template volume to read-write permission.
See Modifying volume permission on p
age 9-14.
Administrative status Whether the volume is online (the default) or offline. Initiato
rs cannot discover or connect to an offline
volume.
See Setting a volume offline or online on page 9-13.
Access controls Conditions that computers must meet to access the
volume and its snapshots. To allow volume or
snapshot access, you must create at least one access control record. You can do this when creating a
volume or after you create the volume.
See About iSCSI target access controls o
n
page 8-1.
Administrator You can assign a volume to a specific volume adminis
trator.
See Modifying the administrator for a volume on page 9-13.
Multi-host access
setting
Whether the volume
allows or disallows (default) access from initiators with different IQNs.
See Allowing or disallowing multi-host volume access o
n page 9-14.
iSNS discovery
setting
By default
, iSNS servers cannot discover iSCSI targets in a group. To allow discovery by iSNS servers,
you must enable this functionality on a volume or snapshot.
See Enabling or disabling iSNS discovery on page
9-14.
RAID preference A PS Series group uses automatic performance load balancing (enabled by default) to identify the
RAID level
that provides the best performance for a volume and store volume data on pool members
with that RAID level, if such members are available.
You can override automatic performance load
bala
ncing by enabling a RAID level preference on a
volume.
Thin clones inherit the RAID preference of the template volume.
See Ena
bling and disabling a volume RAID preference on
page 10-16.
Member binding A PS Series group uses automatic performance load balancing (enabled by default) to identify the
RAID level
that provides the best performance for a volume and store volume data on pool members
with that RAID level, if such members are available.
You can override automatic performance load bal
a
ncing (or ignore any RAID preference for the
volume) by binding a volume to a specific pool member.
Thin clones inherit the member binding of the template volume.
See Binding and unbinding a volume to a member on
page 10-16.
Table 9-1: Volume Attributes (Continued)
Volume Attribute Description