Out of disk space on admin$ during backup

[pshute]

Last night one of our servers got this error during backup:

Failed to prepare guest for hot backup. Error: Cannot upload guest agent's files to the administrative share [\\xxxxxxfs1.nuw.org.au\ADMIN$]. Cannot upload the VSS package. Cannot copy file. Source file: [C:\Program Files (x86)\Veeam\Backup Transport\GuestInteraction\VSS\VeeamGuestHelpers\VeeamVssSupport2003_X86.dll]. Target file: [\\xxxxxxfs1.nuw.org.au\ADMIN$\VeeamVssSupport\VeeamVssSupport.dll]. CopyFile() failed. Win32 error:There is not enough space on the disk. Code: 112

There was close to zero space on that server's C: drive when I looked this morning, down from about 1GB yesterday. I've cleared about 400MB so it can function, and I see 1GB of new files in c:\temp:
"VMware-vCenter-Server-Appliance-6.5.0.12000-7119157-updaterepo.zip.pat5s31.partial"
"VMware-VCSA-all-6.5.0-7119157.iso.r3uox6m.partial"
"VMware-VMvisor-Installer-6.5.0.update01-5969303.x86_64.iso.781zdo0.partial"
"VMware-ESXi-6.5U1-RollupISO.iso.5lim30x.partial"

What are these files? Can I delete them?

It sounds like it copies these files there during each back, then deletes them afterwards. How much space do they need? It looks to me like we had just barely enough room, and then recently the space drifted just a little lower. Can I configure it so it puts them somewhere else?

[marco.horstmann]

Hi,
this are files which are not from us. This are all installation packages from VMware for ESX and vCenter. Sounds like a webbrowser is
downloading it at the moment on the system when I see that file extension.

Kind regards
Marco

[pshute]

Thanks, you're right. Someone has owned up to doing it.

[pshute]

Can you please tell me what Veeam was trying to copy to C:\temp? Just VeeamVssSupport2003_X86.dll? How big is it?

[marco.horstmann]

We use only this folders for executable on guest OSs:
C:\Windows\VeeamVssSupport
C:\Windows\VeeamLogShipper

I think they have only a few megabytes. Nothing really big. Never had an issue with the size yet.

[pshute]

Thanks (don't know why I assumed it would be \temp). I only see C:\WINDOWS\VeeamVssSupport. Does it create and delete these folders again after the backup? So this folder is only still there because the backup failed? Creation date is early this morning.

It doesn't really matter, I'm just curious about how it works.

[veremin]

Does it create and delete these folders again after the backup?

Correct, seems like failed backup job is the reason why this folder got stuck. Thanks.