2009-08-07 09:22 PM
Normally LUN shrink is a rare operation and it makes sense to shrink a LUN when a large part of that LUN is unused over a period of time. Probably Snap Manager treats that LUN as a whole data file from application point of view; hence not allowing doing such operation.
Can you please share with us about the use case for LUN shrinking?
2009-08-07 10:06 PM
As far as I know, Windows Longhorn was supposed to provide this LUN
shrink facility. We need to check this.
But if I understand properly, SDW 5.0 has a feature to reclaim space
from unused file system from ONTAP 7.2.1 onwards. This might work as
virtual LUN shrinking facility.
2009-08-10 06:55 AM
There are two separate features:
Shrinking -- only available with Windows 2008. This will let you actually shrink the size of the lun
Reclaim -- available with DOT 7.2.1+, will let you free up FAS blocks based on NTFS block usage. So if you wrote a 50 GB file in NTFS, then deleted it, you could reclaim the 50GB that ONTAP used within the lun.
2009-08-11 01:27 AM
You could try the LUN resize command from the cli also...... I would be very cautious of this though. I have done it in the lab.... but would I do it with live data... NO
Create a smaller lun if your heart is set on doing it and move the data into the smaller lun.