316 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
2. Next, in the Volume Details subsection you can input the Quantity, Capacity (virtual),
Capacity Savings (choose Thin-provisioned from the drop-down menu), and Name of
the volume being created as shown in Figure 6-26.
Figure 6-26 Volume Details
3. Next, in the Thin Provisioning subsection enter the real and virtual capacity, expansion
criteria, and grain size as shown in Figure 6-27.
Figure 6-27 Thin Provisioning
The Thin Provisioning options are as follows (defaults are displayed in parentheses):
– Real capacity: (2%). Specify the size of the real capacity space used during creation.
– Automatically Expand: (Enabled). This option enables the automatic expansion of
real capacity, if more capacity is to be allocated.
– Warning threshold: (Enabled). Enter a threshold for receiving capacity alerts.
– Grain Size: (256 kibibytes (KiB)). Specify the grain size for real capacity. This option
describes the size of the chunk of storage to be added to used capacity. For example,
when the host writes 1 megabyte (MB) of new data, the capacity is increased by adding
four chunks of 256 KiB each.
Important: If you do not use the autoexpand feature, the volume will go offline after
reaching its real capacity.
The default grain size is 256 KiB. The optimum choice of grain size depends on volume
use type. For more information, see the “Performance Problem When Using EasyTier
With Thin Provisioned Volumes” topic:
https://ibm.biz/BdjvHb
If you are
not going to use the thin-provisioned volume as a FlashCopy source or
target volume, use 256 KiB to maximize performance.
If you
are going to use the thin-provisioned volume as a FlashCopy source or target
volume, specify the same grain size for the volume and for the FlashCopy function.
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