HP Surestore E Disk Array XP256 HP XP P9000 External Storage Access Manager Us - Page 35

Verifying host recognition of a new pair, Verification, In the RAID Manager

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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. 10. From the Priority drop-down menu, select the scheduling order for the initial copy operations. You can enter between 1-256. The highest priority is 1, the lowest priority is 256. The default is 32. For example, if you are creating 10 pairs and you specified in the System Option window that the maximum initial copies that can be made at one time is 5, the priority you assign here determines the order that the 10 pairs are created. 11. From the Difference Management drop-down menu, select the unit of measurement for storing differential data. You can select Auto, Cylinder, or Track. With Auto, the system decides whether to use Cylinder or Track. This is based on the size of the volume. • If VLL is used, the number of cylinders set for VLL is applied. • If the pair volume has 10,019 or more cylinders, Cylinder is applied. • If the pair volume has less than 10,019 cylinders, Track is applied. 12. From the Quorum Disk ID drop-down menu, specify the quorum disk ID that you want to assign to the pair or pairs. 13. Click Set. The settings are shown in the Preview area. 14. In the Preview list, check the settings. To change a setting, right-click and select Modify. To delete a setting, right-click and select Delete. When satisfied, click Apply. This starts pair creation and initial copying if specified. Verifying host recognition of a new pair The final steps in creating new pairs is to make sure the host recognizes the pair and to verify the path configuration from the host to the pair. Remember, with ESAM the host recognizes both P-VOL and S-VOL as a single volume. Verification Make sure that pair status is PAIR and that the Type column in the Pair Operation window shows ESAM for both the primary and secondary storage systems. Until the Type column shows ESAM, application I/Os cannot be taken over in case of a failover. NOTE: In the RAID Manager, the term ESAM is not used. Instead, Continuous Access Synchronous is used. 1. Either reboot the host or use the host operating system's device recognition command. For more information, see the documentation provided with the system. • For Linux host operating systems, make sure that the ESAM pair's status is PAIR before rebooting. If the host reboots when the ESAM pair is not in the PAIR status, a check condition might be reported to the host. • For Solaris host operating systems, make sure the ESAM pair status is PAIR before performing the following operations, otherwise a failure can occur: - An online operation on a path you are not allowed to access. - Rebooting the host. - Dynamic addition of the host device. - Opening the host device. If a path becomes offline, change the ESAM pair status to PAIR and then perform the online operation for the offline path. Volume pair creation 35

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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.
10. From the
Priority
drop-down menu, select the scheduling order for the initial copy operations.
You can enter between 1-256. The highest priority is 1, the lowest priority is 256. The default
is 32.
For example, if you are creating 10 pairs and you specified in the
System Option
window
that the maximum initial copies that can be made at one time is 5, the priority you assign here
determines the order that the 10 pairs are created.
11.
From the
Difference Management
drop-down menu, select the unit of measurement for storing
differential data. You can select Auto, Cylinder, or Track.
With
Auto
, the system decides whether to use
Cylinder
or
Track
. This is based on the size
of the volume.
•
If VLL is used, the number of cylinders set for VLL is applied.
•
If the pair volume has 10,019 or more cylinders, Cylinder is applied.
•
If the pair volume has less than 10,019 cylinders, Track is applied.
12.
From the
Quorum Disk ID
drop-down menu, specify the quorum disk ID that you want to assign
to the pair or pairs.
13.
Click
Set
. The settings are shown in the
Preview
area.
14. In the
Preview
list, check the settings. To change a setting, right-click and select
Modify
. To
delete a setting, right-click and select
Delete
. When satisfied, click
Apply
. This starts pair
creation and initial copying if specified.
Verifying host recognition of a new pair
The final steps in creating new pairs is to make sure the host recognizes the pair and to verify the
path configuration from the host to the pair. Remember, with ESAM the host recognizes both P-VOL
and S-VOL as a single volume.
Verification
Make sure that pair status is PAIR and that the
Type
column in the
Pair Operation
window shows
ESAM for both the primary and secondary storage systems. Until the
Type
column shows ESAM,
application I/Os cannot be taken over in case of a failover.
NOTE:
In the RAID Manager, the term ESAM is not used. Instead, Continuous Access Synchronous
is used.
1.
Either reboot the host or use the host operating system's device recognition command.
For more information, see the documentation provided with the system.
•
For Linux host operating systems, make sure that the ESAM pair’s status is PAIR before
rebooting. If the host reboots when the ESAM pair is not in the PAIR status, a check
condition might be reported to the host.
•
For Solaris host operating systems, make sure the ESAM pair status is PAIR before
performing the following operations, otherwise a failure can occur:
- An online operation on a path you are not allowed to access.
- Rebooting the host.
- Dynamic addition of the host device.
- Opening the host device.
If a path becomes offline, change the ESAM pair status to PAIR and then perform the
online operation for the offline path.
Volume pair creation
35