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readie
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Transform taking 55 hours!

Post by readie » Jan 27, 2014 9:16 am

I have a backup containing several VMs which normally takes 30 to 60 minutes (incremental). However, the 'transform' has now been running for 54 Hours! It does seem to be doing something, as the Transform xx% done is slowly increasing (now got to 98%). Is this going to be normal every week now? Any strategies for improving things. I'm not too worried about the transform taking a long time, but of course the job has now not been run for two nights, so I'm missing two days of backups.
Bob Eadie
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foggy
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Re: Transform taking 55 hours!

Post by foggy » Jan 27, 2014 10:12 am

Bob, what kind of target storage are you using? Please note, that transform operation is heavily random write I/O and is always quite slow comparing to regular backups.

Vitaliy S.
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Re: Transform taking 55 hours!

Post by Vitaliy S. » Jan 27, 2014 10:38 am

Also can you please tell us how many restore points do you have in the backup chain?

readie
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Re: Transform taking 55 hours!

Post by readie » Jan 27, 2014 11:44 am

foggy wrote:Bob, what kind of target storage are you using? Please note, that transform operation is heavily random write I/O and is always quite slow comparing to regular backups.
We're using a Synology SAN device with SATA drives. The Synology allows a 'Windows Share'=CIFS (rather than using it as an iSCSI which it also does). Could use a Windows 2012 server with an iSCSI connection if you think that might be preferable?
7 restore points.
Might 'Reverse Incremental be preferable? I assume this would lead to rather longer backup times each might, but (??) no need for the weekly transform?
Bob
Bob Eadie
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foggy
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Re: Transform taking 55 hours!

Post by foggy » Jan 27, 2014 12:00 pm

readie wrote:We're using a Synology SAN device with SATA drives. The Synology allows a 'Windows Share'=CIFS (rather than using it as an iSCSI which it also does). Could use a Windows 2012 server with an iSCSI connection if you think that might be preferable?
As you can see from Anton's replies in the topic referred above, this kind of storage provides too low IOPS with regular hard drives to perform transform at decent speed. And this does not come down to the connection type.
readie wrote:Might 'Reverse Incremental be preferable? I assume this would lead to rather longer backup times each might, but (??) no need for the weekly transform?
Correct. Daily backups will run longer, however you will avoid extremely long transformation of the entire chain on synthetic full days.

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