netapp lun

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

Paulsolv:
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 ?

Paulsolv,
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.

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

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.

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

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?

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