Operations Using CLI A–3
Hitachi Simple Modular Storage Copy-on-Write SnapShot User’s Guide
Snapshot Enable/Disable is complete.
Operations for SnapShot ConfigurationSetting the POOL
Up to 64 data pools can be designated for each subsystem, by assigning a
logical unit that has been created and formatted. Up to 64 logical units can
be assigned to each data pool. The accurate capacity of a data pool cannot
be determined immediately after an LU has been assigned. Data pool
capacity can only be confirmed approximately 3 minutes per 100 GB.
The following restrictions apply to LUs assigned to a data pool:
• Logical units once assigned to a data pool are no longer recognized by a
host.
• Because data will be lost when excess over the limited value of the
POOL capacity occurs, 20 GB at least is recommended as a standard
POOL capacity. Incidentally, when the POOL capacity being used
exceeds the threshold value (default value: usage rate of 70%), the
pair in the Split status is changed to the Pool full status.
• An LU with a SAS drive and an LU with a SATA drive cannot coexist in a
data pool.
• When using SnapShot with Cache Partition Manager, the segment size
of the LU belonging to a data pool must be the default size (16 kB) or
less.
The following is the procedure for creating a POOL for storing differential
data for use by Snapshot.
To designate data Pool(s) (POOL(s)):
1. From the command prompt, register the subsystem to which you want
to create the Data Pool, then connect to the subsystem.
2. Execute the aupool command create a Data Pool.
First, display the LUs to be assigned to a Data Pool, and then create a
Data Pool.
The following is the example of specifying LU 100 for Data Pool 0.
•
% aupool –unit subsystem-name –availablelist –poolno 0
Data Pool : 0
Available Logical Units
LUN Capacity RAID Group RAID Level Type Status
100 30.0GB 0 6( 9D+2P) SAS Normal
200 35.0GB 0 6( 9D+2P) SAS Normal
%
% aupool –unit subsystem-name –add –poolno 0 -lu 100
Are you sure you want to add the logical unit(s) to the data pool
0?
(y/n[n]): y
The logical unit has been successfully added.
%