Backing up to a Drivepool with different sized drives

[GameOver]

So trying to backup to a Drivepool consisting of 4x10TB and 4x8TB Seagate Ironwolfs with no parity just duplicated.
It keeps coming up with the following error, seemingly randomly "ERROR_NO_SYSTEM_RESOURCES: Insufficient system resources exist to complete the requested service. [CopyFileEx]"

There is plenty of space on the drives, duplication is setup but i only have a total of 32TB of data to backup so even doubled there'd be plenty of space left over

It by default is only copying to the 4x10TBs atm, even if i use rebalance it only uses the 10TB drives, and if they were the only ones there wouldn't be enough space for everything, could that be the issue?

It's doing it with only a few TB's of data backed up and with any file size

Lastly if i stop the transfer and restart it, it goes further before erroring again. Cache issue?
OR if i just use "sync selection" instead of letting it work everything out it seems to work.

Thanx in advance

[therube]

Suffice to say (not that doing so will do much good, at this point) but some "resource" has been used up, that is affecting program operation. (Now just what, that's a different matter ;-).)

About how many files in total are we talking about?
Aside from GDI "resources", there is some resource that >10,000 causes issues (but I don't recall what/where that is found [heh, oh, that is GDI handles, isn't it ;-)]).
So you might check the number of GDI handles in use by FFS.
Process Hacker or Process Explorer (maybe even Task Manger ?) should tell you.

If 'resources' are used up, programs become squirrelly.