Setting Up Data Pools - Hitachi AMS 2000 User Manual

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3. Select the LUN(s) that you want to assign as DMLUs, and then click OK.
A confirmation message displays.
4. Select the Yes, I have read... check box, then click Confirm. When a
success message displays, click Close.

Setting up data pools

On the local array, the data pool stores differential data before it is updated
to the S-VOL. On the remote array, the data pool stores the S-VOL's
previous update as a data-consistent backup when the current update is
occurring. See
Prerequisites
• To review the data pool sizing procedure, see
on page
• Up to 64 LUs can be assigned to a data pool.
• Hitachi recommends a minimum of 20 GB for data pool size.
• A logical unit consisting of SAS drives, SAS(SED) drives, SAS7.2K
drives, SSD drives, and one consisting of SATA drives cannot be used
for a data pool. Set all configured LUs using the same drive type.
• When Cache Partition Manager is used with TCE, the segment size of
LUs belonging to a data pool must be the default size (16 kB) or less.
See Hitachi Storage Navigator Modular 2 Storage Features Reference
Guide for more information.
To create and assign volumes for data pools
1. In Navigator 2 GUI, select the desired array, then click the Show &
Configure Array button.
2. Select the Data Pools icon in the Setup tree view of the Replication tree
view.
The Data Pool list appears.
3. Click Create Data Pool.
The Create Data Pool screen appears.
4. Specify the Data Pool Number and/or Threshold if necessary.
•Setting the LU ownership
NOTE: The default Threshold value is 70%. Specify any value from 50
through 80. When capacity reaches the Threshold plus 1 percent, both data
pool and pair status change to "Threshold over", and the array issues a
warning. If capacity reaches 100 percent, the pair fails and all data in the
S-VOL is lost.
5. Select the Added LU for data pool.
6. Click OK.
7. A message appears. Click Close.
6–12
Hitachi AMS 2000 Family TrueCopy Extended Distance User Guide
Data pools on page 1-4
2-4.
Installation and setup
for more descriptive information.
Calculating data pool size