Hitachi Copy-on Write SnapShot, User Manual, Page: 53 / 90

Monitoring and Maintenance
7–3
Hitachi Simple Modular Storage Copy-on-Write SnapShot User’s Guide
Monitoring Data Pool Usage
The data pools should be monitored frequently.
To monitor data pool usage level
(Advanced users using CLI, see the Storage Navigator Modular 2 Command
Line Interface (CLI) User’s Guide .)
1. In Navigator 2 GUI, select the desired array, then click the Show &
Configure Array button.
2. From the Replication tree, select the Local Replication icon, then select
the Setup icon. The Setup screen displays.
3. Select Data Pools . The Data Pools screen displays.
4. Locate the desired data pool and review the % Used column. This
shows the percentage of the data pool that is being used. Click the
Refresh Information button to make sure the data is current.
If usage reaches the Threshold level or is close to it on a regular basis, the
data pool should be expanded, and/or the lifespan and number of V-VOLs
reduced.
•
Expanding the Data Pool
When monitoring indicates that the data pool is in danger of filling, you can
add new volumes to expand its size.
To expand the data pool capacity
The Storage system allows a maximum of 128 volumes for data pools. One
data pool may consist of up to 64 volumes.
1. Split the pair. For instructions, see
Update the V-VOL on page 6-4 .
2. Add a volume or volumes to the data pool.
Other Methods for Lowering Data Pool Load
When a data pool is in danger of being full, the following actions can be
taken as alternatives or in addition to expanding the data pool:
• Delete one or more V-VOLs. With fewer V-VOLs, less data accumulates
in the data pool.
• Reduce V-VOL lifespan. By holding snapshots for a shorter length of
time, less data accumulates, which relieves the load on the data pool.
A re-evaluation of your SnapShot system’s design may show that not
enough data pool space was originally allocated. See Planning and Design
on page 2-1 for more information.
NOTE: Threshold is set by the user. It is a percentage of the data pool
that, when reached, indicates that maximum capacity is close to being
reached. The default Threshold level is 70%.