Administrator Guide

• Control Access to Hosts (servers) – To prevent inadvertent corruption of the volume caused by multiple hosts writing to it in an
uncoordinated manner, enable multihost access to a volume.
Volume Attributes
You set some attributes when you create a volume; other attributes use default values. In most cases, you can modify all the volume
attributes. Template volumes and thin clones have some restrictions.
Table 7. Volume Attributes describes the attributes that allocate space and set the characteristics of a volume.
Table 7. Volume Attributes
Volume Attribute Description
Name Volume name is unique in the group.
The volume name appears at the end of the iSCSI target name, which the group generates automatically.
Computer access to the volume is always through the iSCSI target name, rather than the volume name.
Description Optional description for the volume — up to 127 characters. Fewer characters are accepted for this eld if
you type the value as a Unicode character string, which takes up a variable number of bytes, depending
on the specic character.
Storage pool Name of pool for the volume. The group stores all the volume data on the pool members. The default is
the default pool.
Thin clones must reside in the same pool as the template volume. If you move a template volume to a
dierent pool, all the attached thin clones also move.
Reported size Reported size of the volume in MB, GB, or TB. The group rounds up volume sizes to the next 15MB if the
size is not a multiple of 15MB. You cannot change the reported size of a template volume.
Thin provisioning
settings
Controls 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 groupwide volume settings.
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 groupwide snapshot reserve setting.
If data reduction has been enabled on the volume, snapshot reserve is permanently disabled.
iSCSI alias Name that some iSCSI initiators display. Use the alias to identify the iSCSI target. The default is the
groupwide volume setting.
Permission Indicates whether the volume is read-write (the default) or read-only. You cannot set a template volume to
read-write permission.
Administrative status Indicates whether the volume is online (the default) or oine. Initiators cannot discover or connect to an
oine volume.
Access controls Conditions that hosts must meet to access the volume and its snapshots. To allow volume or snapshot
access, you must create at least one access control policy. You can create the policy when you create a
volume or after you create the volume.
Administrator You can assign a volume to a specic volume administrator.
Multihost access
setting
Indicates whether the volume allows or disallows (default) access from initiators with dierent IQNs.
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.
44
Architecture Fundamentals