HP Surestore E Disk Array XP256 HP XP P9000 External Storage Access Manager Us - Page 37

Procedure, Resynchronizing pairs, Actions > Remote Copy > Continuous Access Synchronous

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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.) • 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 track of updates while the pair is split. Choose this setting if the P-VOL is required for system operation and you need to keep the P-VOL online while the pair is split. 6. Click Set. The settings are shown in the Preview area. 7. In the Preview list, check the settings. To change a setting, right-click and select Modify. When satisfied, click Apply. The primary storage system will complete all write operations in progress before splitting the pair, so that the pair is synchronized at the time of the split. 8. Verify that the operation is completed successfully by checking the Status column. The status should be PSUS. Resynchronizing pairs When you resynchronize a split pair, the volume that was not being updated-usually the S-VOL-is synchronized with the volume that was being updated by the host-usually the P-VOL. Pair status during resynchronization changes to COPY. It changes again to PAIR when the operation is complete. The method for performing this operation differs according to whether the P-VOL or the S-VOL is accepting write I/O from the host. Check the VOL Access column in the Pair Operation window to see which volume is online. • Pairs must be in PSUS or PSUE when the P-VOL is receiving I/O. If status is PSUE, clear the error before resynchronizing. The operation can be performed using the RWC procedure below. • When the S-VOL is receiving host I/O, pair status must be SSWS. The operation is performed by running the RAID Manager pairresync-swaps command. NOTE: If you want to resynchronize the pair that has been released from the S-VOL side, do not use this procedure. Instead, complete the following: 1. Release the pair from the P-VOL side by running the pairsplit-S RAID Manager command. 2. Create the pair from the P-VOL side using the Paircreate(ESAM) dialog box, making sure to set the appropriate initial copy option (Entire Volume or None). 1. Access the MCU in RWC, then click Actions > Remote Copy > Continuous Access Synchronous > Pair Operation. Resynchronizing pairs 37

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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.)
•
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/Oto 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
track of updates while the pair is split. Choose this setting if the P-VOL is required for
system operation and you need to keep the P-VOL online while the pair is split.
6.
Click
Set
. The settings are shown in the
Preview
area.
7.
In the
Preview
list, check the settings. To change a setting, right-click and select
Modify
. When
satisfied, click
Apply
. The primary storage system will complete all write operations in progress
before splitting the pair, so that the pair is synchronized at the time of the split.
8.
Verify that the operation is completed successfully by checking the
Status
column. The status
should be PSUS.
Resynchronizing pairs
When you resynchronize a split pair, the volume that was not being updated—usually the S-VOL—is
synchronized with the volume that was being updated by the host—usually the P-VOL.
Pair status during resynchronization changes to COPY. It changes again to PAIR when the operation
is complete.
The method for performing this operation differs according to whether the P-VOL or the S-VOL is
accepting write I/O from the host. Check the VOL Access column in the
Pair Operation
window
to see which volume is online.
•
Pairs must be in PSUS or PSUE when the P-VOL is receiving I/O. If status is PSUE, clear the
error before resynchronizing. The operation can be performed using the RWC procedure
below.
•
When the S-VOL is receiving host I/O, pair status must be SSWS. The operation is performed
by running the RAID Manager
pairresync-swaps
command.
NOTE:
If you want to resynchronize the pair that has been released from the S-VOL side, do not
use this procedure. Instead, complete the following:
1.
Release the pair from the P-VOL side by running the
pairsplit-S
RAID Manager command.
2.
Create the pair from the P-VOL side using the
Paircreate(ESAM)
dialog box, making sure to
set the appropriate initial copy option (
Entire Volume
or
None
).
1.
Access the MCU in RWC, then click
Actions > Remote Copy > Continuous Access Synchronous
> Pair Operation
.
Resynchronizing pairs
37