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ShadowProtect Backup Very Slow

Posted on 2012-03-17
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2,710 Views
Last Modified: 2012-04-07
I'm trying to backup an iSCSI volume (about 1.5TB) attached to a Windows Server 2008 R2 virtual machine (on Hyper-V), but every time I kick off the seed the backup starts running at about 800KBps and says it's going to take 21 days to complete.

If, however, I just copy a 46GB file from the iSCSI volume and just paste it to the share on the BDR (also Server 2k8 R2), it runs at 80+MBps solid. In other words, I can't seem to replicate the problem outside of ShadowProtect. I have already tried some suggestions about disabling TCP Checksum Offload on both the VM NIC and host NIC, but it hasn't made a difference. And help is greatly appreciated -
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Question by:ajahnke
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Expert Comment

by:S00007359
ID: 37735353
are you trying to backup the "iSCSI volume (about 1.5TB)" from the hyper-v host. or is the shadowprotect installed in the guest os.
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Author Comment

by:ajahnke
ID: 37735460
ShadowProtect is installed on the guest OS, which has exclusive access to the iSCSI volume.
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Expert Comment

by:S00007359
ID: 37735537
so it's like a Raw Device mapping. how big are the luns.
has the backup ever worked before.

trying backup up a 1tb volume.

where is it backing up to.
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Expert Comment

by:Jian An Lim
ID: 37735568
check with storagecraft support, they are helpful.

One thing they will ask which is the disk spin when the shadowprotect running.
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Accepted Solution

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ajahnke earned 0 total points
ID: 37797509
I'm going to close this ticket - I had already reached out to ShadowProtect support, who finally got back to me with the lousy response of "ShadowProtect doesn't work with anything other than local, internal storage". This of course seemed ludicrous to me - how then am I supposed to use this 'industry leading' software to backup iSCSI volumes? I asked them that and they just chose not to respond. I did enable multiple threads on the job, however, which took the time from 21 days down to 5-6. The job eventually completed and now the incrementals are able to complete as usual, even under the adverse conditions.
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Author Closing Comment

by:ajahnke
ID: 37818690
There was no real solution to the problem - enabling multiple threads seemed to help, but for some reason this type of backup isn't supported by StorageCraft.
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