HP XP Racks - Manual (Page 122)

6. In the Task Name text box, enter the task name.
You can enter up to 32 ASCII characters and symbols in all, except for \ / : , ; * ? " < > |.
The value "date-window name" is entered by default.
7. In the Confirm window, click Apply to register the setting in the task.
If the Go to tasks window for status check box is selected, the Tasks window appears.
Working with pools
About pools
Thin Provisioning requires the use of pools. A pool consists of more than one pool-VOL. Pages in
the pool are assigned to store user data and control information. Four pages on a THP V-VOL are
required for the control information.
A storage system supports up to 128 pools, each of which can contain up to 1024 pool-VOLs and
63,232 THP V-VOLs per pool. The pool for Thin Provisioning cannot be used in conjunction with
other pools.
The 128-pool maximum per storage system applies to the total number of Thin Provisioning pools
and Smart Tiers pools. The pool for Thin Provisioning or Smart Tiers cannot be used in conjunction
with other pools.
A pool number must be assigned to a pool. Multiple THP V-VOLs can be related to one pool.
The total pool capacity combines the capacity of all the registered Thin Provisioning pool-VOLs
assigned to the pool. Pool capacity is calculated using the following formulas:
•
capacity of the pool (MB) = total number of pages * 42 - 4200
4200 in the formula is the management area size of the pool-VOL with System Area.
•
total number of pages = Σ(floor(floor(pool-VOL number of blocks ч 512) ч
168)) for each pool-VOL
where
•
floor( ) means to truncate the part of the formula within the parentheses after the decimal point.
About pool-VOLs
Pool-VOLs are grouped together to create a pool. When a new pool is created, the available
pool-VOLs are selected in the Select Pool VOLs window and added to the Selected Pool Volumes
table. Every pool must have a pool-VOL with System Area.
During initial creation of a pool, designate a pool-VOL as the pool-VOL with System Area, select
the pool-VOL, and click Change Top Pool VOL in the selected pool volumes table.
When adding a volume to the pool for which Smart Pool is enabled, note the following:
•
Up to three different drives types/RPM are allowed between all the pool-VOLs to be added.
•
Volumes to be added to the same pool must have the same RAID level across all the same
drive type/RPM pool-VOLs.
For example, you cannot add a volume whose drive type/RPM is SAS/15k and whose RAID
level is 5 (3D+1P) when a volume whose drive type/RPM is also SAS/15k but whose RAID
level is 5 (7D+1P) is already in the pool
•
Up to three values are allowed for Drive Type/RPM for the volume.
If you increase the pool capacity by adding a pool-VOL, a portion of the existing data in the pool
automatically migrates from an older pool-VOL to the newly added pool-VOL, balancing the usage
levels of all the pool-VOLs. If you do not want to automate balancing of the usage levels of
pool-VOLs, call HP Technical Support for assistance.
122 Configuring thin provisioning