HP XP Racks - Manual (Page 53)

1. For Base Secondary Volume, select the initial S-VOL's Port ID, Host Group ID, and LUN
ID. If you are selecting only one P-VOL, this LU is the secondary volume. If you select
multiple P-VOLs for pairing, this LUN is the base S-VOL that is assigned to the first P-VOL
and from which subsequent S-VOL LUNs are assigned to the list of P-VOLs.
CAUTION: In XP24000/XP20000 Disk Array and P9500, LUN IDs display in
hexadecimal numbers. In XP7, LUN IDs display in decimal or hexadecimal numbers. If
you have selected the decimal notation, when assigning an S-VOL in a XP24000/XP20000
Disk Array or P9500 storage system, make sure to convert the hexadecimal LUN ID
number to decimal.
2. For Selection Type, select the method for assigning S-VOLs when multiple primary volumes
are selected.
- With Interval, specify an interval the system skips between secondary system LU numbers.
3. - With Relative Primary Volume, the system assigns secondary system LU numbers based
on proximity to P-VOL LU numbers.
7. Click Options to define the following optional settings:
1.
For Primary Volume Fence Level, specify whether the primary system allows or rejects
write operations to the P-VOL when the pair is split due to an error.
- Data: The P-VOL cannot be written to.
- Status: The P-VOL can be written to if the primary system can change S-VOL status to
PSUE; otherwise cannot be written to.
- Never: The P-VOL can always be written to.
2. For Initial Copy Type, specify whether to copy data from P-VOL to S-VOL during the
operation.
- Entire Volume creates the pair and copies data to the S-VOL. (Default)
- None creates the pair but data is not copied to the S-VOL. This requires that data in the
P-VOL and S-VOL are already identical.
3. For Copy Pace, specify the number of tracks to be copied per remote I/O during the
operation. The range is 1-15; 15 is the default. This option affects performance as follows:
- 1 to 5 is slow, improves performance and lowers impact to host I/O.
- 5 to 10 is medium.
- 11 to 15 is fast, may lower performance and increase impact to host I/O.
4. For Initial Copy Priority, specify the scheduling order for the initial copy operation. The
range is 1 to 256; 32 is the default.
If a time-out error occurs during this operation, the order specified in Initial Copy Priority
may not run as expected. A time-out error can occur because of the CU configuration or
data path error. Review the error, delete the pair with an error, then retry the operation.
8. Back again in the Primary Volume Selection box, select the primary volume to be copied first
and click Add>. The volume and pair information moves to the Selected Pairs table.
In the Selected Pairs table, you can change pair options by selecting it and clicking Change
Settings. Remove a pair by selecting it and clicking Remove.
9. Click Finish.
10. In the Confirm window, review the settings and enter a task name in the Task Name box.
11. Click Apply to save your settings in the system.
Splitting pairs
You can split a pair, which suspends data copying to the S-VOL.
Splitting pairs 53