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For details on Thin Image or Copy-on-Write Snapshot specifications such as
maximum number of mirrored volumes, volumes and operations, please see
the Hitachi Thin Image User Guide or Hitachi Copy-on-Write Snapshot User
Guide for your storage system.
Pair operations and commands for Copy-on-Write Snapshot and Thin
Image
The following table shows the pair operations and commands that can be
used for Copy-on-Write Snapshot and Thin Image pairs.
Command
paircreate
pairsplit
pairresync
paireventwait
pairmon
pairvolchk
pairdisplay
raidscan
raidcom
*The MU numbers that can be used and referenced are from 0 to 63.
Creating a Copy-on-Write Snapshot pair
The CCI command for creating a Thin Image or Copy-on-Write Snapshot pair
is the same as for ShadowImage. However, Thin Image pair can only operate
up to 64 S-VOLs. Therefore, use raidcom command if you want to operate
more than 64 S-VOLs.
The RAID storage system determines whether it is a ShadowImage pair or a
Thin Image/Copy-on-Write Snapshot pair by the attribute of the S-VOL. The
RAID storage system also determines whether it is a Thin Image pair or a
Copy-on-Write Snapshot pair by the type of the pool to be used.
A Thin Image pair is generated in the following two cases:
•
When a V-VOL (OPEN-0V) is specified as an S-VOL.
•
When a pool for Thin Image is specified as the pool type.
6-34
Thin Image: Up to 1,024 secondary volumes can be defined for each P
VOL.
Copy-on-Write Snapshot: Up to 64 secondary volumes can be defined
for each P VOL.
Copy-on-Write
Snapshot
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Data replication operations with CCI
Command Control Interface User and Reference Guide
Thin Image (cascade
Thin Image
pairs, pairs with the
Yes*
No
Yes*
No
Yes*
No
Yes*
No
Yes*
No
Yes*
No
Yes*
No
Yes*
No
Yes
Yes
clone attribute)
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Troubleshooting
