Operations For Snapshot Configuration; Setting The Dmlu - Hitachi AMS2100 User Manual

•
% auopt -unit array-name -refer
Option Name
SNAPSHOT
%
SnapShot Enable/Disable is complete.

Operations for SnapShot configuration

Setting the DMLU

The DMLU (Differential Management Logical Unit) is an exclusive logical unit
for storing the differential data while the volume is being copied. The DMLU
in the array is treated in the same way as the other logical units. However,
a logical unit that is set as the DMLU is not recognized by a host (it is
hidden).
Prerequisites
• DMLU setup is required.
• The DMLU must be set with a minimum size of 10 GB.
• One DMLU is required, though two are recommended. The second one
is used as a backup.
To designate DM-LUs:
1. From the command prompt, register and connect to the array to which
you want to create the DMLU.
2. Execute the audmlu command to create a DMLU.
This command first displays LUs that can be assigned as DMLUs and
later creates a DMLU.
Example:
•
% audmlu
Available Logical Units
LUN Capacity
%
% audmlu
Are you sure you want to set the DM-LU? (y/n [n]): y
The DM-LU has been set successfully.
%
3. A DMLU can be released only if two DM-LUs exist. If only one DMLU
exists, it cannot be released.
To release a DMLU, specify the -rm and -lu options in the audmlu
command.
B–10
Hitachi AMS 2000 Family Copy-on-Write SnapShot User Guide
Reconfigure Memory Status
Normal
–unit array-name –availablelist
RAID Group DP Pool RAID Level
0 10.0 GB
–unit array-name –set -lu 0
Operations using CLI
Type Term
Permanent ---
0 N/A 5( 4D+1P) SAS
Status
Disable
Type Status
Normal