netapp lun

Posted on 2014-09-20
Last Modified: 2014-09-26
I have a volume which has only one lun.
The fractional reserve set to zero and it has enough space for snapshots.
Some reason the lun went offline . I checked the vol space and noticed  that is 99% used in free space.
i checked the snap list, but no snapshots since yesterday.
What is the reason the unused space in the volume goes low?
Question by:sara2000
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Expert Comment

ID: 40334910
1.  Take a look at snapshots.  The combination of data and snapshots
2.  Take a loot at the LUN status using system manager.  It may be that the LUN is thin provisioned and is fragmented which is basically using up the space.  To get this cleaned up you'll need to use snapdrive after expanding the volume or LUN and then running  space reclaimation

Author Comment

ID: 40334929
Thank you for the reply.  Lun is mounted using snap drive. I see there are few snapshots . The combinations of data and snapshots fill the volume to 99%.
There is a free space in the os level.
Why the lun goes offline if we do not take snapshot ?
LVL 42

Accepted Solution

paulsolov earned 500 total points
ID: 40334945
you stated that there are a few snapshots.  If the snapshots and actual LUN data fill the Netapp volume the LUN will go offline to protect it from corrupting data.  Delete snapshots and/or grow Netapp volume to provide enough space for the LUN to operate.  

There are several reasons why the LUN may go offline, a snapmanager snapshot may be occuring or the LUN is thin provisioned and growing or LUN is a log volume for instance that keeps writing files and deleting them which may cause fragmented LUN.

Grow the Netapp volume, mount the LUN back up, run space reclaimation on snadrive for this LUN and review snapshots to make sure there are no old or orphaned snapshots in place

Author Comment

ID: 40335582
Thank you so much. This lun is being used by database. It is possible that lot of activities are taking place on this lun. Also it s being snap mirrored. The snapshots are kepis for 7 days.
Is there anyway we can find the space size of the each snapshot.
I noticed that % used is 50, 40 12 etc.
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LVL 42

Expert Comment

ID: 40335751
Use Netapp System Manager and take a look at snapshots view for the volume in question

Author Comment

ID: 40335786
Sanpshot is scheduled for 11pm. I was expecting the snapshot will fill the space on the volume when the smapmirror runs at 11pm and the lun will go offline at that time if the volume do not have enough space for the snapshot..
But Lun went off line after few hrs of snap mirror.
LVL 42

Expert Comment

ID: 40335794
if volume is a log volume could be fragmented.  Run the space reclaimation from snapdrive.  It will ask if you want to run it but it will tell you how much space can be reclaimed.  What is the space break on netapp volume with respect to snapshots and LUN

Author Comment

ID: 40336302
Sanapshot auto delete removed the old snapshot (50% used) and took another snapshot last night, it is 0% used.
I was expecting to free up space when it delete 50%used snapshot, but it did not happen.
i checked the vol options and noticed that FR=0 and snap reserve=0.
Lun size has not been changed.
What the reason then the vol space has not been changed?
LVL 42

Expert Comment

ID: 40345504
Lun size is satic, did you run space reclamation on the LUN using snap drive?

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