Chapter 9. Advanced features for storage efficiency 459
If you create a volume within a multi-tiered storage pool and navigate to Volumes →
Volumes by Pool panel, details such as the number of MDisks and the number of
volumes within the selected pool are displayed. The pool icon for an Easy Tier Pool differs
from the pools without Easy Tier enabled as shown in Figure 9-19.
If the Easy Tier Status column is enabled, the Easy Tier Status of each volume is
displayed. Volumes inherit the Easy Tier state of their parent pool, but Easy Tier can be
toggled on or toggled off at the volume level, if required. See “Enabling or disabling Easy
Tier on single volumes” on page 463.
Figure 9-19 Volumes by pool panel
If external storage is used as a drive class, you must select the drive class type manually
and add the external MDisks to a storage pool. If the internal storage and the external
storage are in different drive classes, this action also changes the storage pool to a
multi-tiered storage pool and enables Easy Tier on the pool and associated volumes.
9.2.14 Downloading Easy Tier I/O measurements
After enabling Easy Tier the Automatic Data Placement Mode is active. Extents are
automatically migrated to or from disk tiers and the statistics summary collection is now
active. The statistics log file can be downloaded to analyze how many extents were migrated
and to monitor whether it makes sense to add more drives from an specific drive class to the
multi-tiered storage pool.
Heat data files are produced approximately once a day (that is, roughly every 24 hours) when
Easy Tier is active on one or more storage pools.
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