Sun Storage 2500, 2500-M2, and 6000 Arrays: How Virtual Disk (VDisk) Defragmentation Works

Asset ID:	1-79-1614831.1
Update Date:	2015-07-17
Keywords:

Solution Type Predictive Self-Healing Sure

Solution 1614831.1 : Sun Storage 2500, 2500-M2, and 6000 Arrays: How Virtual Disk (VDisk) Defragmentation Works

Applies to:

Sun Storage 2530 Array - Version Not Applicable and later
Sun Storage 2540-M2 Array - Version Not Applicable and later
Sun Storage 2530-M2 Array - Version Not Applicable and later
Sun Storage 2510 Array - Version Not Applicable and later
Sun Storage 6580 Array - Version All Versions and later
Information in this document applies to any platform.

Purpose

The intent of this document is to explain what occurs when defragmentation is running. Defragmentation is carried out from the Sun Storage Common Array Manager (CAM) browser user interface (BUI) or command line (CLI).

For more detailed information about the effects of defragmentation and when to consider running defragmentation, refer to <Document 1007871.1> Cannot Use All of the Remaining Capacity on a Sun StorEdge 6000 or 2500 Arrays to Create a Volume.

Details

When you initiate a defragmentation process, you indicate a virtual disk, or vdisk. You might therefore expect that a single job is created. In fact the operation affects all of the volumes within the virutal disk, and a separate job is created for each volume. When monitoring the progress of defragmentation, it is important to realize that multiple jobs may be involved. In some cases when the size of a volume is small, the job may not even be reported, as the time to defragment is too short to be registered and displayed.

You can track the progress of defragmentation jobs by examining the majorEventLog file (MEL) that is captured as part of the supportData for the array. Please refer to <Document 1002514.1> Collecting Sun Storage Common Array Manager Support Data for Arrays. The MEL contains the internal event logs for the array.

The MEL excerpt below shows the start and stop of the defragmentation for the volume vol-data1 in the virtual disk called VirtualDisk 3.

The start of the defragmentation is reported as:

Date/Time: Tue Jan 14 08:53:57 CET 2014
Sequence number: 17258
Event type: 500F
Event category: Command
Priority: Informational
Description: Start virtual disk defragment
Event specific codes: 0/0/0
Component type: VirtualDisk
Component location: VirtualDisk 3
Logged by: Controller in slot A

and the individual jobs that are started on each volume are reported as:

Date/Time: Tue Jan 14 08:53:57 CET 2014
Sequence number: 17257
Event type: 2028
Event category: Notification
Priority: Informational
Description: Modification (reconfigure) started
Event specific codes: 0/0/0
Component type: Volume
Component location: vol-data1
Logged by: Controller in slot A
..
..
..
..
Date/Time: Tue Jan 14 21:25:07 CET 2014
Sequence number: 17260
Event type: 2029
Event category: Notification
Priority: Informational
Description: Modification (reconfigure) completed
Event specific codes: 0/0/0
Component type: Volume
Component location: vol-data1
Logged by: Controller in slot A

You can view information about defragmentation jobs in the CAM BUI under the jobs section, or via CLI:

sscs list -a <array name as seen in CAM> jobs

Example:

sscs list -a 6540-array jobs

Job ID: 2014.01.15.13.38.24.106 Status: Done
Job ID: 2014.01.15.13.40.29.382 Status: Done
Job ID: 2014.01.15.13.42.32.874 Status: In Progress

Where `sscs` is under:

Solaris: /opt/SUNWstkcam/bin/
Linux: /opt/sun/cam/bin/
Windows: C:\Program Files\Sun\Common Array Manager\bin

To view details on each job, click on the job ID in the CAM BUI, or via the CLI:

sscs list -a <array name as seen in CAM> jobs <job ID to view>

Example:

# ./sscs list -a 6540-array jobs 2014.01.15.13.38.24.106
Job ID: 2014.01.15.13.38.24.106
Type:                Virtual Disk Defragmentation
Status:              Done
% Complete:          100
Time to Completion: 00:00:00

# ./sscs list -a 6540-array jobs 2014.01.15.13.40.29.382
Job ID: 2014.01.15.13.40.29.382
Type:                Virtual Disk Defragmentation
Status:              Done
% Complete:          100
Time to Completion: 00:00:00

# ./sscs list -a 6540-array jobs 2014.01.15.13.42.32.874
Job ID: 2014.01.15.13.42.32.874
Type:                Virtual Disk Defragmentation
Status:              In Progress
% Complete:          57
Time to Completion: 00:02:38
Priority:            Unknown

References

<NOTE:1007871.1> - Cannot Use All of the Remaining Capacity on a Sun StorEdge 6000 or 2500 Arrays to Create a Volume.

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