HP XP7 Storage - Manual (Page 9)

For more information about consistency and snapshot groups, see “Consistency and snapshot
groups” (page 9) .
•
XP7 storage system software applications:
Fast Snap
For more information about FS, see “Fast Snap” (page 10) .
◦
◦ Thin Provisioning (THP)
For more information about THP, see “Thin Provisioning” (page 10) .
◦ RAID Manager (RAID Manager)
You can run RAID Manager commands to perform FS tasks (see “Pair tasks using the
RAID Manager or Remote Web Console” (page 148) and the HP XP7 RAID Manager
Reference Guide).
Components of Fast Snap pairs
An FS pair consists of a P-VOL, one or more S-VOLs, and one or more pool-VOLs. The P-VOL is an
individual logical data volume, or logical device (LDEV). The S-VOL is a V-VOL. LDEVs include
V-VOLs of provisioning type THP. You can only use V-VOLs that are used by an FS pair as an
S-VOL. P-VOL differential data is stored as snapshot data in pool-VOLs (LDEVs).
NOTE: To use FS, THP, and the other XP7 storage system software applications, you must acquire
licenses with HP (see “Thin Provisioning” (page 10) .)
Related topics
•
For more information about selecting the provisioning type, see “Creating LDEVs” (page 51) .
Consistency and snapshot groups
A consistency group is a group of pairs on which you simultaneously perform pair tasks on the
pairs within the group. You can define FS, Cnt Ac-S, Cnt Ac-J, and BC pairs in consistency groups.
A snapshot group is a group of FS pairs on which you also can perform pair tasks. Use consistency
or snapshot groups to perform FS tasks on all of the pairs within the group. You define FS pairs to
a snapshot group when you create the pairs.
The following table shows the differences between consistency groups and snapshot groups.
Snapshot group Consistency group Item
8,192 8,192 Pair limit per group
512 256 Limit
Not guaranteed Guaranteed Data consistency
FS Cnt Ac-S, Cnt Ac-J, and BC XP7 storage system software application from which you can
define pairs
Related topics
•
“Consistency group requirements” (page 31) .
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“Snapshot group requirements” (page 31) .
•
“Creating Fast Snap pairs and defining them in snapshot or consistency groups using the RAID
Manager” (page 63)
.
•
“Workflow for creating groups and storing snapshot data using the RAID Manager” (page 12) .
Components of Fast Snap 9