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5 Posts
0
16857
June 12th, 2012 10:00
1.5 TB wants to move up the next data progression cycle
Hi,
I'm wondering about the value I'm seeing in the middle of the day for data pending moving up within tier 1.
Correct me if I'm wrong, but the data progression cycle is the replay schedule? It's 6 pm for us.
I have 1.5 TB waiting to move up. Where can I learn more about that data to know if it should be moving up. There's still debate amongst my team whether the backup schedule is confusing the calculation and making it work for nothing.
If 1.5 TB wants to move up and the data progression starts at 6 pm, then 1.5 TB was changed after hours, causing speculation that the backups are causing all of this.
Thanks,
rudif
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hallidayr
48 Posts
1
June 13th, 2012 09:00
The default for data progression to start running is at 7:00 PM, but yes its decisions are based off of replays and the storage profiles you configure. If you're keeping backups on the Compellent you should look into moving that LUN onto a storage profile at a very low tier (RAID5 on SATA) otherwise the SAN will just see some blocks churning and punt them up to expensive disks once the magic threshold is reached.
If you mean that you have, say, 1.5 TB of virtual machines that you think is getting moved up, that sounds like a different issue to me. I just checked the little book that came with the "Compellent Certified Storage Administrator" course and there's no reference to how to see which volumes have blocks that will be migrated, and I don't see anything in my 5.0.4 storage center GUI. Probably need to call Copilot to find out what the deal is.
rudif
5 Posts
0
June 27th, 2012 10:00
Thanks for your feedback.
We learned from co-pilot that a snapshot from our snapshot client can only use the storage profile of the original volume. At one point I thought you could create snapshots and use a different storage profile to keep the snapshot in tier 2 and 3 but there's no mechanism for choosing the storage profile when creating a snapshot using our backup software (netbackup)
No progress as to what is waiting to move up within tier 1 but we're assured it's not the backup software creating snapshots, which are mounted to a media server for backup to tape.
hallidayr
48 Posts
0
June 28th, 2012 08:00
Hmm, indeed it would share the same profile but data progression will keep working on snapshots... normally it shuffles them down to the lowest tier defined in your storage profile.
Curious indeed what would be making all that data move. Your backup software doesn't do something like set an archived bit on every file it touches, right?