364 Implementing the IBM Storwize V7000 V6.3
10.5.1 Enabling Easy Tier evaluation mode
If you want to enable Easy Tier in evaluation mode, you must enable Easy Tier on a
single-tiered storage pool. Connect to your IBM Storwize V7000 using the CLI and run
lsmdiskgrp (Example 10-1). This command shows an overview about all configured storage
pools and the Easy Tier status of the pool. In our example, there are two storage pools listed:
mdiskgrp0 with Easy Tier inactive, and Multi_Tier_Pool with Easy Tier enabled.
Example 10-1 List storage pools
IBM_2076:admin>lsmdiskgrp
id name status mdisk_count ... easy_tier easy_tier_status
0 mdiskgrp0 online 3 ... auto inactive
1 Multi_Tier_Pool online 3 ... auto active
To get a more detailed view of the single-tiered storage pool, run lsmdiskgrp storage pool
name (Example 10-2).
Example 10-2 Storage Pools details - Easy Tier inactive
IBM_2076:admin>lsmdiskgrp mdiskgrp0
id 0
name mdiskgrp0
status online
mdisk_count 3
...
easy_tier auto
easy_tier_status inactive
tier generic_ssd
tier_mdisk_count 0
...
tier generic_hdd
tier_mdisk_count 3
...
To enable Easy Tier on a single-tiered storage pool, run chmdiskgrp -easytier on storage
pool name (Example 10-3). As this storage pool does not have any SSD MDisks, it is not a
multitiered storage pool; only measuring is available.
Example 10-3 Enable Easy Tier on a single-tiered storage pool
IBM_2076:admin>chmdiskgrp -easytier on mdiskgrp0
IBM_2076:admin>
Check the status of the storage pool again by running lsmdiskgrp storage pool name again
(Example 10-4).
Example 10-4 Storage pool details - Easy Tier ON
IBM_2076:admin>lsmdiskgrp mdiskgrp0
id 0
name mdiskgrp0
status online
mdisk_count 3
vdisk_count 7
...
easy_tier on
Chapter 10. Easy Tier 365
easy_tier_status active
tier generic_ssd
tier_mdisk_count 0
...
tier generic_hdd
tier_mdisk_count 3
...
Run svcinfo lsmdiskgrp again (Example 10-5), and you see that Easy Tier is turned on the
storage pool now, but that Automatic Data Placement Mode is not active on the multitiered
storage pool.
Example 10-5 Storage pool list
IBM_2076:admin>lsmdiskgrp
id name status mdisk_count vdisk_count ... easy_tier easy_tier_status
0 mdiskgrp0 online 3 7 ... on active
1 Multi_Tier_Pool online 3 0 ... auto active
To get the list of all the volumes defined, run lsvdisk (Example 10-6). For this example, we
are only interested in the redhat1 volume.
Example 10-6 All volumes list
IBM_2076:admin>lsvdisk
id name IO_group_id IO_group_name status mdisk_grp_id
5 redhat1 0 io_grp0 online many many
...
To get a more detailed view of a volume, run lsvdisk volume name (Example 10-7). This
output shows two copies of a volume. Copy 0 is in a multitiered storage pool and Automatic
Data Placement is active, Copy 1 is in the single-tiered storage pool, and Easy Tier
evaluation mode is active, as indicated by the easy_tier_status measured line.
Example 10-7 Volume details
IBM_2076:admin>lsvdisk redhat1
id 5
name redhat1
IO_group_id 0
IO_group_name io_grp0
status online
mdisk_grp_id many
mdisk_grp_name many
capacity 10.00GB
...
copy_id 0
status online
sync yes
primary yes
mdisk_grp_id 1
mdisk_grp_name Multi_Tier_Pool
...
easy_tier on
easy_tier_status active
366 Implementing the IBM Storwize V7000 V6.3
tier generic_ssd
tier_capacity 0.00MB
tier generic_hdd
tier_capacity 10.00GB
...
copy_id 1
status online
sync yes
primary no
mdisk_grp_id 0
mdisk_grp_name mdiskgrp0
....
easy_tier on
easy_tier_status measured
tier generic_ssd
tier_capacity 0.00MB
tier generic_hdd
tier_capacity 10.00GB
...
These changes are also reflected in the GUI (Figure 10-26). Select the Show Details check
box to view the details of the Easy Tier for each of the volume copies.
Figure 10-26 Easy Tier status by volume
Easy Tier evaluation mode is now active on the single-tiered storage pool (mdiskgrp0), but
only for measurement. To download the I/O statistics and analyze them, see 10.4.2,
“Downloading Easy Tier I/O measurements” on page 362.
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