Chapter 9. Advanced features for storage efficiency 463
parent_mdisk_grp_name Enterprise_Pool
child_mdisk_grp_count 0
child_mdisk_grp_capacity 0.00MB
type parent
IBM_Storwize:ITSO_V5000:superuser>
Easy Tier measured mode does not place data. Easy Tier measured mode collects statistics
for measurement only. For more information about downloading the I/O statistics, see 9.2.14,
“Downloading Easy Tier I/O measurements” on page 459.
Enabling or disabling Easy Tier on single volumes
By default, enabling Easy Tier on a storage pool also enables it for the volume copies that are
inside the selected pool. This setting applies to multi-tiered and single-tiered storage pools. It
is also possible to turn on and turn off Easy Tier for single volume copies.
Before you disable Easy tier on a single volume, run the svcinfo lsmdisgrp storage pool
name command to list all storage pools that are configured, as shown in Example 9-4. In our
example, Multi_Tier_Pool is the storage pool that is used as a reference.
Example 9-4 Listing the storage pool
IBM_Storwize:ITSO_V5000:superuser>svcinfo lsmdiskgrp
id name status easy_tier easy_tier_status
.
1 Multi_Tier_Pool online on active
.
.
IBM_Storwize:ITSO_V5000:superuser>
Run the svcinfo lsvdisk command to show all configured volumes within your IBM Storwize
V5000 Gen2, as shown in Example 9-5. For this example, we are only interested in a single
volume.
Example 9-5 Show all configured volumes
IBM_Storwize:ITSO_V5000:superuser>svcinfo lsvdisk
id name IO_group_id status mdisk_grp_id mdisk_grp_name capacity
0 Volume001 0 online 1 Multi_Tier_Pool 5.00GB
IBM_Storwize:ITSO_V5000:superuser>
To disable Easy Tier on single volumes, run the svctask chvdisk -easytier off volume
name command, as shown in Example 9-6.
Example 9-6 Disable Easy Tier on a single volume
IBM_Storwize:ITSO_V5000:superuser>svctask chvdisk -easytier off Volume001
IBM_Storwize:ITSO_V5000:superuser>
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