Volume Migration pair statuses and global-active device pair operations

Ops Center High Availability User Guide

Version
10.9.x
File Size
3.9 MB
Audience
anonymous
Part Number
MK-99ADM003-14

You should understand what GAD operations you can do given the Volume Migration pair status and whether the GAD P-VOL or S-VOL is shared by Volume Migration.

The following table describes operations you can perform according to the Volume Migration pair status when the GAD P-VOL is shared by Volume Migration.

Volume Migration pair status GAD pair operation
Create Suspend Delete

Resynchronize

P-VOL specified S-VOL specified P-VOL specified1 S-VOL specified2 Force delete

P-VOL specified

S-VOL specified

SMPL(PD) No4 Yes5 Yes5 Yes No3 Yes No No
COPY No4 Yes5 Yes5 Yes No3 Yes No No
PSUS No4 Yes5 Yes5 Yes No3 Yes No No
PSUE No4 Yes5 Yes5 Yes No3 Yes No No
Note:
  1. You can delete a GAD pair by specifying the P-VOL, only when the I/O mode is Local and the GAD pair status of the P-VOL is PSUS or PSUE.
  2. You can delete a GAD pair by specifying the S-VOL, only when the I/O mode is Local and the GAD pair status of the S-VOL is SSWS.
  3. Cannot be done because the virtual LDEV ID of the GAD P-VOL (volume for Volume Migration) is deleted if you specify the S-VOL to delete the GAD pair.
  4. To perform Volume Migration, you must suspend the GAD pair.
  5. To perform Volume Migration, you must suspend the GAD pair. Therefore, you can suspend the GAD pair, however the status of the GAD pair does not change because the GAD pair is already suspended.

The following table describes what you can do according to the Volume Migration pair status when the GAD S-VOL is shared by Volume Migration.

Volume Migration pair status GAD pair operation
Create Suspend Delete

Resynchronize

P-VOL specified S-VOL specified P-VOL specified1 S-VOL specified2 Force delete

P-VOL specified

S-VOL specified

SMPL(PD) No3 Yes5 Yes5 No4 Yes Yes No No
COPY No3 Yes5 Yes5 No4 Yes Yes No No
PSUS No3 Yes5 Yes5 No4 Yes Yes No No
PSUE No3 Yes5 Yes5 No4 Yes Yes No No
Note:
  1. You can delete a GAD pair by specifying the primary volume, only when the I/O mode is Local and the GAD pair status of the primary volume is PSUS or PSUE.
  2. You can delete a GAD pair by specifying the secondary volume, only when the I/O mode is Local and the GAD pair status of the secondary volume is SSWS.
  3. To create a GAD pair, you must assign the GAD reserve attribute to the volume used as an S-VOL. Because the virtual LDEV ID of the volume to which the GAD reserve attribute is assigned is deleted, you cannot create a GAD pair by specifying the volume used for Volume Migration as the S-VOL of the pair.
  4. Cannot be done because the virtual LDEV ID of the GAD S-VOL (volume for Volume Migration) is deleted if you specify the P-VOL to delete the GAD pair.
  5. To perform Volume Migration, you must suspend the GAD pair. Therefore, you can suspend the GAD pair, however the status of the GAD pair does not change because the GAD pair is already suspended.