HP XP P9500 Storage - Manual (Page 10)

To use FS, create pools. With FS, you can add pool-VOLs but you cannot delete them. To delete
a pool, delete all of the FS pairs.
CAUTION: The pool capacity is calculated by subtracting the capacity of V-VOL management
areas from the total capacity of pool-VOLs in the pool. If you write data to FS pair volumes and
the amount of pool usage exceeds the pool capacity, the following occurs:
•
You cannot store snapshot data.
•
The FS pair status changes to “PSUE”, which indicates a failure.
•
You cannot create additional FS pairs.
Reserve a sufficient amount of pool capacity when creating pools.
V-VOLs
V-VOLs do not have any physical storage space. V-VOLs must be created prior to creation of FS
pairs because FS uses V-VOLs as S-VOLs.
Releasing V-VOL definitions
You cannot release V-VOL definitions that you are using as FS S-VOLs. To release definitions of
V-VOLs, release the FS pairs that are using the V-VOLs.
Fast Snap pairs
S-VOLs of FS pairs are V-VOLs. First define the V-VOLs then create FS pairs. You can specify up
to 1,024 S-VOLs for a P-VOL.
To create FS pairs, use the Create Pair window. For more information, see “Creating Fast Snap
pairs” (page 41) .
To create an FS pair, specify the pool to be used for the FS pair. If multiple FS pairs share the same
P-VOL, the pairs must also share the same pool. For example, if you specify three S-VOLs for a
P-VOL, specify the same pool for the three FS pairs.
To release an FS pair, use the Delete Pairs window. Deleting an FS pair changes the volume status
to “SMPL”. You cannot create FS pairs using unpaired volumes (“SMPL” status).
You can confirm the status of a volume on Local Replications window and the View Pair Properties
window.
Storing snapshot data for a group workflow
You can use the RAID Manager to define a consistency group or a snapshot group and store
snapshot data for the group.
The following figure illustrates how snapshot data for a group is stored.
For information about differences between snapshot groups and consistency groups, see
“Consistency groups” (page 8) .
10 Overview of Fast Snap