HP XP Racks - Manual (Page 27)

NOTE: Copy operations that are stopped by the Copy Threshold option will resume once the
load on the storage system becomes light.
Effects of Auto LUN on other program products
When differential data is being copied, longer copying time can be expected for the following
program products:
•
Auto LUN
•
Business Copy
•
Business Copy Z
•
Compatible FlashCopy
The following table shows the amount of additional copy time expected for the affected program
products. The increase in copy time may be as much as doubled and depends on the number of
pairs set to the program product.
Table 17 Estimated delay in copy time for Auto LUN and other program products
Estimated delay in copying speed (in minutes) Capacity of Migrated Volume (MB)
4 0 - 1,000
18 1,001 - 5,000
37 5,001 - 10,000
186 10,001 - 50,000
372 50,001 - 100,000
1,860 100,001 - 500,000
3,720 500,001 - 1,000,000
9,667 1,000,001 - 2,150,400
The above estimates are calculated based on the assumption that the workload for update I/Os
for the migrated volume is 50 IOPS for one volume.
Best practices
Do not perform Auto LUN operations during storage system maintenance activities (such as,
installation, replacement, removal of cache or drives, configuration changes, or replacement of
the microcode).
CAUTION: If a volume migration operation of Auto LUN is in progress and the SVP is in Modify
mode, the Auto LUN process might not complete and the volume might remain being migrated. In
this case, make sure that the SVP is in View mode.
Before turning off the power on the storage system, confirm that all Auto LUN operations are
complete. If you turn off the power of the storage system during Auto LUN operations, and power
is later restored, Auto LUN operations resume, but there is a risk that data may be lost from the
shared memory. If this happens, Auto LUN begins recopying all data, both the differential data
not yet migrated as well as the data previously copied to the target volume before the power
interruption.
Effects of Auto LUN on other program products 27