Storage Array Performance During Virtual Disk Copy
The following factors contribute to the overall performance of the storage array:
•
I/O activity
•
Virtual disk RAID level
•
Virtual disk configuration — Number of drives in the virtual disk groups
•
Virtual disk type — Snapshot virtual disks may take more time to copy than standard virtual disks
During a virtual disk copy, resources for the storage array are diverted from processing I/O activity to completing a
virtual disk copy. This affects the overall performance of the storage array. When you create a new virtual disk copy,
you define the copy priority to determine how much controller processing time is diverted from I/O activity to a virtual
disk copy operation.
Setting Copy Priority
You can use the Copy Manager to select the rate at which a virtual disk copy completes for a selected copy pair. You
can change the copy priority for a copy pair at any of these times:
•
Before the virtual disk copy begins
•
While the virtual disk copy has a status of In Progress
•
When you re-create a virtual disk copy
To set copy priority:
1.
In the AMW, select the Storage & Copy Services tab and select Copy Services → Virtual Disk Copy → Manage
Copies.
The Copy Manager window is displayed.
2.
In the table, select one or more copy pairs.
3.
Select Change → Copy Priority.
The Change Copy Priority window is displayed.
4.
In the Copy Priority area, select the appropriate copy priority, depending on your system performance needs.
NOTE: There are five copy priority rates available:
–
lowest
–
low
–
medium
–
high
–
highest
If the copy priority is set at the lowest rate, I/O activity is prioritized, and the virtual disk copy takes longer.
Stopping A Virtual Disk Copy
You can stop a virtual disk copy operation that has an In Progress status, a Pending status, or a Failed status. Stopping a
virtual disk copy that has a Failed status clears the Needs Attention status displayed for the storage array.
Keep these guidelines in mind when you stop a virtual disk copy:
•
To use this option, select only one copy pair in the Copy Manager.
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