HP XP Racks - Manual (Page 36)

How multipath software shows storage serial number for pairs
How multipath software shows storage serial number for pairs Multipath software shows the serial
number of the primary storage system for both the P-VOL and the S-VOL.
However, the storage system model shown for both P-VOL and S-VOL is the earliest model used in
your configuration, regardless of its location, primary or secondary site.
•
If you use P9500s on the primary and the secondary sites, multipath software shows the serial
number of the primary storage system for both the P-VOL and the S-VOL. The storage system
is shown as P9500.
•
When P9500 is used on the primary site and XP24000 is used on the secondary site, multipath
software shows the serial number of the primary storage system for both the P-VOL and the
S-VOL. The storage system is shown as XP24000.
•
When XP24000 is used on the primary site and P9500 is used on the secondary site, multipath
software shows the serial number of the primary storage system for both the P-VOL and the
S-VOL. The storage system is shown as XP24000.
Splitting pairs
When the pair is synchronized, data written to the P-VOL is copied to the S-VOL. This continues
until the pair is split.When you split a pair, the pair status changes to PSUS and updates to the
S-VOL stop.
You can set an option to block updates to the P-VOL while the pair is split. This results in the P-VOL
and S-VOL staying synchronized.
If the P-VOL accepts write I/O while the pair is split, the primary storage system records the updated
tracks as differential data. This data is copied to the S-VOL when the pair is resynchronized.
The pair can be made identical again by resynchronizing the pair.
NOTE: You can split a pair from either the P-VOL or S-VOL.
Prerequisites
The pair must be in PAIR status.
Procedure
1. Access the MCU or RCU in RWC, then click Actions > Remote Copy > Continuous Access
Synchronous > Pair Operation.
You do not need to vary the P-VOL offline.
2. Make sure that you are in the modify mode.
3. In the Pair Operation window tree, select the CU group, CU, port, or host group where the
pair volume is located.
4. In the volume list, right-click the pair to be split and click Pairsplit-r from the menu. You can
split more than one pair by selecting then right-clicking more than one volume.
5. In the Pairsplit-r dialog box, information for the selected volume is shown for Volume. When
more than one volume is selected, the volume with the lowest LUN is shown.
From the Suspend Kind drop-down menu, specify whether or not to continue host I/O writes
to the P-VOL while the pair is split. (If you are running the RAID Manager command from the
S-VOL, this item is disabled.)
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Select P-VOL Failure not to allow write I/O to the P-VOL while the pair is split, regardless
of the P-VOL fence level setting. Choose this setting if you need to maintain synchronization
of the ESAM pair.
•
Select S-VOL to allow write I/O to the P-VOL while the pair is split. The P-VOL will accept
all subsequent write I/O operations after the split. The primary storage system will keep
36 Working with volume pairs