Hotadd fails backup when more than 1 scsi controller

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Hotadd fails backup when more than 1 scsi controller

Veeam Logoby JaySt » Fri Jun 16, 2017 3:03 pm

i'm running into an issue with a VMware hotadd proxy, Windows 2012 R2 fully patched, backing up a vSphere 6.5 environment running latest patches. Case id is 02189771
i never seen this one before in previous installs.

the backup fails when more than one SCSI (LSI, SAS) controller is presented to the proxy VM. But only in that case. When the backup is started with only the first SCSI controller active, everything runs fine.
I can see a VM disk being mounted (in disk management) during the backup in the case of 2 SCSI controllers on the proxy, but no read activity is performed at all on the mounted disk. it gets dismounted eventually, and the job fails (or fails over to nbd). I run the exact same job again, only this time with one SCSI controller on the proxy, job runs ok.

Any ideas? anyone seen this before?

More details:
VM hardware version 13
no AV active in proxy
automount is disabled
Veeam version 9.5 update 2
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Re: Hotadd fails backup when more than 1 scsi controller

Veeam Logoby skrause » Fri Jun 16, 2017 8:14 pm

Have you tried VMWare Paravirtual for the second controller?
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Re: Hotadd fails backup when more than 1 scsi controller

Veeam Logoby JaySt » Sun Jun 18, 2017 9:12 am

no not yet. Is a Paravirtual adapter supported by VDDK/Hotadd? i think this may not be case case when reading https://www.veeam.com/kb1054

Update:
Hmm seems like at some point VDDK best practice reccomendations switched from LSI tot PVSCSI in vSphere 6.5
“Best Practices for HotAdd Transport” formerly recommended the LSI controller over the paravirtual SCSI controller (PVSCSI). Documentation has been corrected; PVSCSI is preferred for HotAdd in VDDK 6.5. The current recommendation is to use PVSCSI only and upgrade to 6.5 or later. If problems occur, HotAdd a dummy disk in case the first HotAdd found an unexpected target/unit on the guest OS"
http://pubs.vmware.com/Release_Notes/en/developer/vddk/65/vsphere-vddk-65-release-notes.html

Not sure if things work when the boot controller is LSI and the second controller is PVSCSI. It might require PVSCSI for the bootcontroller as well.
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Re: Hotadd fails backup when more than 1 scsi controller

Veeam Logoby skrause » Tue Jun 20, 2017 2:06 pm

I have been using the PVSCSI controllers exclusively on my 5.5 environment for 3 years now and have had no issues using hot-add.
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Hotadd fails backup when more than 1 scsi controller

Veeam Logoby tmtech » Tue Aug 01, 2017 7:47 pm

I'm running vbr 9.5 u2 on server 2016 datacenter with one proxy, VMware esxi 6. After lots of troubleshooting final verdict was to remove cdrom and sata controller from vbr vm's.
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