GhettoVCB: unable to backup due to error in vmdk backup

Sean Rhudy
Sean Rhudy used Ask the Experts™
on
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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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
can you test copy the VM when off to the NAS, does it fail?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
Test with Jumbo Frames enabled.
Sean RhudyPresident

Author

Commented:
Jumbo frames enabled on the VM or on the NAS?
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
ESXi, network and NAS, failing at 50-60% would indicate a copy operation failure to NAS.
Sean RhudyPresident

Author

Commented:
So what can i do?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
enable jumbo frames, test your NAS can handle the copy, change the datastore name to local datastore to eliminate network copy issue.
Sean RhudyPresident

Author

Commented:
What do you mean by changing the data store name to local data store?  The NAS is already configured as a datastore on Esxi.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
use a local datastore for the backup, and test
Sean RhudyPresident

Author

Commented:
Backup to local data store was successful...I enabled Jumbo frames (4000) on the NAS, but it still failed.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
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.
Sean RhudyPresident

Author

Commented:
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?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
USB could possible solve this issue, although slow in our experience.

a dumb switch is unlikely to handle jumbo frames.
President
Commented:
Updating the firmware on the Synology Diskstation fixed the issue.
Sean RhudyPresident

Author

Commented:
Only solution

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