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Is deleting all checkpoints and hence the Savvol space a safe and recommended method to reclaim space on the VNX?
We are looking to explore option to reduce the space utilization on our VNX. Deduplicationa nd compression are already in place.
We see a lot of space being consumed by our checkpoints which are created. I understand deleting all checkpoints can help us reclaim some space.
But is that a safe and recommended practice? Wont it leave us in a risky situation for sometime?
What other option can anyone suggest here? Can we create an additional Savvol and try moving checkpoints to it... are such option available and possible on a VNX 5500?
umichklewis
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November 8th, 2017 15:00
I'm surprised no one has replied to this. Yes, you can delete checkpoints to recover Savvol space. VNX OE supports out-of-order checkpoint deletion, so you can delete checkpoints without fear of them expiring incorrectly.
As you noted, you will need to delete all of the checkpoints to be able to recover Savvol space - once Savvol space grows to account a checkpoint, it will not be recovered until there are no checkpoints. For example, if you have a 1TB fs with 200GB of Savvol used by four checkpoints, you will not recover the 200GB Savvol until all four checkpoints are deleted.
By default, once the first checkpoint is taken of a filesystem, all subsequent checkpoints will use the same volume - you cannot easily specify a new volume for checkpoints without first deleting the other checkpoints.
Let us know if that helps!
Karl
Rainer_EMC
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November 9th, 2017 04:00
on VNX OE 8.1.8.19 and above you can also reclaim unused savvol space if you are using pools LUNs
basically then when thin LUNs are used we figure out which blocks inside the savvol arent used and free (unmap) them on the pool level.
the logical savvol size will not change but you get more free blocks in the pool
note that this only helps if your savvol has grown in the past (it never shrinks) and is now not completely utilized by the current checkpoints