Hp XP P9500 Storage Bedienungsanleitung PDF herunterladen (Seite 52)

• 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.

• Another option is to enable I/O to the S-VOL from a host. The secondary system records the

updated tracks as differential data. When the pair is resynchronized, the secondary system

sends the differential data to the primary system which merges all differential data to determine

which tracks are out-of-sync.

Prerequisite information

The pair must be in PAIR status.

Procedure 6 To split one or more pairs

1. On the menu bar, click Actions > Remote Copy > Continuous Access Synchronous > Pair

Operation. The Pair Operation window opens.

2. Change to Modify mode by clicking the icon.

3. In the tree, select the port, host group, CU, or the CU grouping where the pair is located.

4. In the volume list, select the Continuous Access Synchronous pair(s) that you want to split.

To split a LUSE pair with a status of PDUB, perform the pairresync operation on the LUSE pair,

then split the pair (PDUB indicates that the status of one or more individual LDEV pairs within

the LUSE pair is SMPL or PSUE (due to some error condition).

5. Right-click, and select Pairsplit-r from the menu. The Pairsplit-r dialog box displays.

6. From the S-VOL Write list, select one of the following:

• Enable, to cause host writes to be accepted by the S-VOL while the pair is split.

If using this option, you must also select S-VOL in the Suspend Kind option below. This

ensures that P-VOL and S-VOL bitmaps are merged when the pair is resynchronized.

Do not use the P-VOL failure suspend kind option if the P-VOL is required for system

operation. Make sure to use the S-VOL suspend kind option, so that the P-VOL continues

accepting I/Os.

This option is not available when performing the split operation from the secondary system.

• Disable (default), to cause host input to be rejected by the S-VOL while the pair is split.

7. From the Suspend Kind list, select one of the following:

• S-VOL (default). The P-VOL accepts host write I/O (though still adheres to the fence level

in failure conditions).

This setting should be used when you need to keep the P-VOL online.

• P-VOL Failure. The primary system will reject host write I/O to the P-VOL while the pair

is split, regardless of fence level.

Use this option when you need to maintain synchronization of the pair while it is split.

Do not use this option if the P-VOL is required for system operation.

8. Click Set then Apply.

If the operation does not start normally, an error code displays in the Error Code column in the

Preview list. To display an error message, select the LU, right-click, and select Error Detail.

Resynchronize pairs

While a Continuous Access Synchronous pair is split, the primary system does not perform update

copy operations to the S-VOL. Resynchronizing a pair updates the S-VOL with differential data

accumulated since the split, so that its data is again identical with the P-VOL’s data. Update copy

operations begin again to the S-VOL.

52 Pair operations

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 112 113

Kommentare zu diesen Handbüchern

Keine Kommentare

Hp XP P9500 Storage Bedienungsanleitung Seite 52

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Lager Hp XP P9500 Storage