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GhettoVCB: unable to backup due to error in vmdk backup

Posted on 2012-04-04
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Last Modified: 2012-04-14
Hello,

I just setup GhettoVCB to backup our 2 VM's to a Synology Diskstation NAS using NFS.  The backup kicks off fine, and usually fails around 50-60% then goes to the next VM, and does the same thing.  I'm testing this at night when no other backups are ran and no users are in the office.  I've read that you can modify the NFS settings on the NAS to help, but I do not see any advanced settings on this NAS, just enable.
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Question by:seanrhudy
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14 Comments
 
LVL 118
ID: 37808383
can you test copy the VM when off to the NAS, does it fail?
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LVL 118
ID: 37808384
Test with Jumbo Frames enabled.
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Author Comment

by:seanrhudy
ID: 37808393
Jumbo frames enabled on the VM or on the NAS?
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LVL 118
ID: 37808426
ESXi, network and NAS, failing at 50-60% would indicate a copy operation failure to NAS.
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Author Comment

by:seanrhudy
ID: 37808447
So what can i do?
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LVL 118
ID: 37808452
enable jumbo frames, test your NAS can handle the copy, change the datastore name to local datastore to eliminate network copy issue.
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Author Comment

by:seanrhudy
ID: 37808478
What do you mean by changing the data store name to local data store?  The NAS is already configured as a datastore on Esxi.
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LVL 118
ID: 37808563
use a local datastore for the backup, and test
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Author Comment

by:seanrhudy
ID: 37821234
Backup to local data store was successful...I enabled Jumbo frames (4000) on the NAS, but it still failed.
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LVL 118
ID: 37821272
so the issue lies with your NAS datastore, or network connection connection between ESXi server and NAS, or write speed of NAS. GhettoVCB scripts are working successfully.

Jumbo Frames are usually 9000 mtu, and must be enabled on NAS, network switches and ESXi server.
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Author Comment

by:seanrhudy
ID: 37821384
The switch is not a managed switch, so I probably won't be able to enable jumbo frames on the switch.  Do you think a USB attached drive would eliminate some of these issues?
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LVL 118
ID: 37821448
USB could possible solve this issue, although slow in our experience.

a dumb switch is unlikely to handle jumbo frames.
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Accepted Solution

by:
seanrhudy earned 0 total points
ID: 37825874
Updating the firmware on the Synology Diskstation fixed the issue.
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Author Closing Comment

by:seanrhudy
ID: 37845977
Only solution
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