HP Surestore E Disk Array XP256 HP XP P9000 External Storage Access Manager Us - Page 38

Reverse resynchronization, Prerequisites, Procedure, Pair Operation, Pairresync, P-VOL Fence Level

Get HP Surestore E Disk Array XP256 PDF manuals and user guides View all HP Surestore E Disk Array XP256 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 38 highlights

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 P-VOL is located. 4. In the volume list, right-click the P-VOL in the pair to be resynchronized and click Pairresync. In the Pairresync dialog box, P-VOL Fence Level is automatically set to Never. The volume receiving updates from the host will never be fenced, or blocked, from receiving host read/write. 5. In the Pairresync dialog box, from the Copy Pace drop-down menu, select the desired number of tracks to be copied at one time (1-15) during the copy operation. The default setting is 15. If you specify a large number, such as 15, copying is faster, but I/O performance of the storage system may decrease. If you specify a small number, such as 3, copying is slower, but the impact on I/O performance is lessened. 6. From the Priority drop-down menu, select the scheduling order for the copy operations. This applies when multiple pairs are being resynchronized. You can enter between 1-256. The highest priority is 1, the lowest priority is 256. The default is 32. 7. Click Set. 8. In the Preview list, check the settings. To change a setting, right-click and select Modify. When satisfied, click Apply. Update the pair status by clicking File/Refresh, then confirm that the operation is completed with a status of PAIR. Reverse resynchronization After a failover, when the S-VOL is receiving updates from the host instead of the P-VOL, you can resynchronize the P-VOL with the S-VOL by running the RAID Manager pairresync-swaps command. Copy direction is from S-VOL-to-P-VOL. The P-VOL and S-VOL are swapped in this operation: the secondary storage system S-VOL becomes the P-VOL; the primary storage system P-VOL becomes the S-VOL. The pairresync -swaps command is the only supported method for reverse resynchronizing ESAM pairs. Prerequisites Make sure that: • All errors are cleared. • Pair status is SSWS. Procedure 1. Run the RAID Manager pairresync -swaps command on the S-VOL. The data in the RCU S-VOL is copied to the MCU P-VOL. Also, the P-VOL and S-VOL is swapped. The MCU P-VOL becomes the S-VOL, and the RCU S-VOL becomes the P-VOL. 2. When the operation completes, verify that the pair is in PAIR status. The following figure shows the swapping of an ESAM P-VOL and S-VOL. 38 Working with volume pairs

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
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
P-VOL is located.
4.
In the volume list, right-click the P-VOL in the pair to be resynchronized and click
Pairresync
.
In the
Pairresync
dialog box,
P-VOL Fence Level
is automatically set to
Never
. The volume
receiving updates from the host will never be fenced, or blocked, from receiving host
read/write.
5.
In the
Pairresync
dialog box, from the
Copy Pace
drop-down menu, select the desired number
of tracks to be copied at one time (1-15) during the copy operation. The default setting is 15.
If you specify a large number, such as 15, copying is faster, but I/O performance of the
storage system may decrease. If you specify a small number, such as 3, copying is slower,
but the impact on I/O performance is lessened.
6.
From the
Priority
drop-down menu, select the scheduling order for the copy operations. This
applies when multiple pairs are being resynchronized. You can enter between 1-256. The
highest priority is 1, the lowest priority is 256. The default is 32.
7.
Click
Set
.
8.
In the
Preview
list, check the settings. To change a setting, right-click and select
Modify
. When
satisfied, click
Apply
.
Update the pair status by clicking
File/Refresh
, then confirm that the operation is completed with
a status of PAIR.
Reverse resynchronization
After a failover, when the S-VOL is receiving updates from the host instead of the P-VOL, you can
resynchronize the P-VOL with the S-VOL by running the RAID Manager
pairresync-swaps
command. Copy direction is from S-VOL-to-P-VOL.
The P-VOL and S-VOL are swapped in this operation: the secondary storage system S-VOL becomes
the P-VOL; the primary storage system P-VOL becomes the S-VOL.
The
pairresync -swaps
command is the only supported method for reverse resynchronizing
ESAM pairs.
Prerequisites
Make sure that:
•
All errors are cleared.
•
Pair status is SSWS.
Procedure
1.
Run the RAID Manager
pairresync -swaps
command on the S-VOL.
The data in the RCU S-VOL is copied to the MCU P-VOL. Also, the P-VOL and S-VOL is
swapped. The MCU P-VOL becomes the S-VOL, and the RCU S-VOL becomes the P-VOL.
2.
When the operation completes, verify that the pair is in PAIR status.
The following figure shows the swapping of an ESAM P-VOL and S-VOL.
38
Working with volume pairs