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Removing checkpoints
We have had write performance problems that were so bad, we had to move a major email archvie storage application from NAS (file level) back to a Virtual Server (block level). We have read that others have this problem due to checkpoints. We have 42 checkpoints (3 per day for 2 weeks) for each of 2 of our 5 file systems. We have daily Backup Exec backups running, so we are going to try removing all checkpoints and see if performance changes. I have already paused the 2 scheduled checkpoint events for fileserver1 and fileserver2 (our CIFS servers and related filesystems). So, I want to begin deleting checkpoints now. Is there a best practice for this? Should I start with the oldest checkpoint and do the one at a time? Should I remove all of the checkpoints associated with a particular filesystem before deleting the second set of checkpoints? Will there be an impact on my SAN while removing checkpoints? I am going to track performance testing as I delete these checkpoints. The theory is that due to the number of checkpoints and the type of storage it resides on, that it adds up to bad write performance. Anyway, any advice would be helpful. I want to try and get these removed today if possible.
Thank you.
Deleting checkpoints now and it seem to be going well. Once all are gone, will I see my savvol space per file system change right away or is there some clean task that must be done? That is another reason I am removing these is to get needed white space back from bloated savvol space. I am only using 3% of 5.6TB of savvol space at this time. I hope to get that back and maybe start up checkpoints again in the future.
Ok, so, even if I delete the 42 checkpoints I created via a schedule, my 5.6TB of savvol space will be there until i remove the replication checkpoints? yikes! I am replicating this filesystem to a secondary site. How do i clear out the replication checkpoints and then let them start again? Do I have to pause or stop replication? Will I have to begin replication anew?
dynamox
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Posted December 27th, 2012 05:00
i thought this performance issue was resolved with the latest File OE version ? I always delete checkpoints from oldest to newest to older, not sure if it makes any different but that's how i do it. I don't think it matters one checkpoint or many checkpoints, file system is doing COFW so if there was any issue related to that it would happen even with just one checkpoint.