To determine which logical drives have reservations, run the
show (logicalDrive) reservations
command. To remove a reservation, run the
clear (logicalDrive) reservations
command.
Storage Subsystem Performance
During a VolumeCopy operation, the resources of the storage subsystem might be diverted from
processing I/O activity to completing a VolumeCopy, which might affect the overall performance of the
storage subsystem.
These factors contribute to the performance of the storage subsystem:
v
The I/O activity
v
The logical drive RAID level
v
The logical drive configuration (number of disk drives in the subsystems and cache parameters)
v
The logical drive type (FlashCopy logical drives might take more time to copy than standard logical
drives)
When you create a new VolumeCopy, you define the copy priority to determine how much controller
processing time is allocated for a VolumeCopy compared with I/O activity.
Copy priority has five relative settings ranging from highest to lowest. The highest priority rate supports
the logical VolumeCopy, but I/O activity might be affected. The lowest priority rate supports I/O activity,
but the VolumeCopy takes longer. You define the copy priority when you create the VolumeCopy pair.
You can redefine the copy priority later by using the
set VolumeCopy
command. You can also redefine the
VolumeCopy priority when you recopy a logical drive.
Restrictions
These restrictions apply to the source logical drive, the target logical drive, and the storage subsystem:
v
While a VolumeCopy operation has a status of In Progress, Pending, or Failed, the source logical drive
is available for read activity only. After the VolumeCopy finishes, read activity from and write activity
to the source logical drive is permitted.
v
A logical drive can be selected as a target logical drive for only one VolumeCopy at a time.
v
The maximum allowable number of VolumeCopies per storage subsystem depends upon the storage
subsystem configuration.
v
A logical drive that is reserved by the host cannot be selected as a source logical drive or as a target
logical drive.
v
A logical drive with a status of Failed cannot be used as a source logical drive or as a target logical
drive.
v
A logical drive with a status of Degraded cannot be used as a target logical drive.
v
You cannot select a logical drive that is participating in a modification operation as a source logical
drive or as a target logical drive. Modification operations include Dynamic Capacity Expansion (DCE),
Dynamic RAID Level Migration (DRM), Dynamic Segment Sizing (DSS), Dynamic Volume Expansion
(DVE), and defragmenting an subsystem.
VolumeCopy Commands
The following table lists the VolumeCopy commands and briefly describes what the commands do.
Table 9-1. VolumeCopy Commands
Command
Description
create VolumeCopy
Creates a VolumeCopy and starts the
VolumeCopy operation.
disable storageSubsystem feature
VolumeCopy
Turns off the current VolumeCopy operation.
Chapter 9. Using the VolumeCopy Premium Feature
9-3
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