ajahnke
asked on
ShadowProtect Backup Very Slow
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 -
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 -
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.
ASKER
ShadowProtect is installed on the guest OS, which has exclusive access to the iSCSI volume.
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.
has the backup ever worked before.
trying backup up a 1tb volume.
where is it backing up to.
check with storagecraft support, they are helpful.
One thing they will ask which is the disk spin when the shadowprotect running.
One thing they will ask which is the disk spin when the shadowprotect running.
ASKER CERTIFIED SOLUTION
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ASKER
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.