Dell EqualLogic PS6210XS EqualLogic Group Manager Administrator s Guide PS Ser - Page 123

About Overriding Automatic Load Balancing, Shut Down a Group, Procedure

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• To enable a volume RAID preference, make sure that at least one member in the volume's pool has the preferred RAID level. If no pool member has the preferred RAID level, the group ignores the RAID preference until a member exists with the preferred RAID level. • If you disable a RAID preference on a volume, the group resumes automatic performance load balancing. Procedure To enable or disable a volume RAID preference: 1. Click Volumes. 2. Expand Volumes and select the volume name. 3. Click Modify settings and then click the Advanced tab to open the Modify volume settings - Advanced dialog box. 4. Select either: • Preferred RAID level under Volume RAID preference. • Automatic to disable a RAID preference 5. Click OK. About Overriding Automatic Load Balancing 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 balancing (or ignore any RAID preference for the volume) by binding a volume to a specific pool member. If you bind a volume to a pool member, the group stores the volume data on the member, instead of distributing data across multiple pool members. The following restrictions apply: • You can bind a volume only to a member that is in the same pool as the volume. • If you bind a volume to a member and then delete that member from the pool or group, the group cancels the bind operation. • Thin clones inherit the member binding setting, if any, of the template volume. You cannot have a separate member binding setting for a thin clone. • You cannot enable synchronous replication on a volume that is bound to a group member. • You cannot use the Group Manager GUI to bind a volume to a member. Instead, you must use the following Group Manager CLI command line: volume select volume_name bind member_name To unbind a volume from a member, use the following CLI command line: volume select volume_name unbind See the Dell EqualLogic Group Manager CLI Reference Guide for more information about using CLI commands. Shut Down a Group To perform maintenance, you might need to shut down a PS Series group. While the group is shut down, volumes are not available. 1. Stop all I/O applications connected to the group. 2. Disconnect iSCSI initiators from the group. 3. Shut down each group member. Do not turn off power to the PS Series array until you cleanly shut down the member. To shut down a member: a. Click Group. PS Series Group Operations 123

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•
To enable a volume RAID preference, make sure that at least one member in the volume’s pool has the preferred RAID level. If no
pool member has the preferred RAID level, the group ignores the RAID preference until a member exists with the preferred RAID
level.
•
If you disable a RAID preference on a volume, the group resumes automatic performance load balancing.
Procedure
To enable or disable a volume RAID preference:
1.
Click
Volumes
.
2.
Expand
Volumes
and select the volume name.
3.
Click
Modify settings
and then click the
Advanced
tab to open the Modify volume settings – Advanced dialog box.
4.
Select either:
•
Preferred RAID level under
Volume RAID preference
.
•
Automatic
to disable a RAID preference
5.
Click
OK
.
About Overriding Automatic Load Balancing
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 balancing (or ignore any RAID preference for the volume) by binding a volume to a
specific
pool member.
If you bind a volume to a pool member, the group stores the volume data on the member, instead of distributing data across multiple
pool members.
The following restrictions apply:
•
You can bind a volume only to a member that is in the same pool as the volume.
•
If you bind a volume to a member and then delete that member from the pool or group, the group cancels the bind operation.
•
Thin clones inherit the member binding setting, if any, of the template volume. You cannot have a separate member binding
setting for a thin clone.
•
You cannot enable synchronous replication on a volume that is bound to a group member.
•
You cannot use the Group Manager GUI to bind a volume to a member. Instead, you must use the following Group Manager CLI
command line:
volume select
volume_name
bind
member_name
To unbind a volume from a member, use the following CLI command line:
volume select
volume_name
unbind
See the
Dell EqualLogic Group Manager CLI Reference Guide
for more information about using CLI commands.
Shut Down a Group
To perform maintenance, you might need to shut down a PS Series group. While the group is shut down, volumes are not available.
1.
Stop all I/O applications connected to the group.
2.
Disconnect iSCSI initiators from the group.
3.
Shut down each group member. Do not turn
off
power to the PS Series array until you cleanly shut down the member.
To shut down a member:
a.
Click
Group
.
PS Series Group Operations
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