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Apologies if this has been posted elsewhere, I could not find it. Describes the issue in detail and how to fix: https://www.alldiscoveries.com/how-to-fix-high-ram-usage-during-defrag-on-windows-server-virtualized-with-qemu/

From: https://github.com/openzfs/zfs/issues/15526#issuecomment-1826476737 robn commented: "@admnd I am 100% certain that zvols on Linux are not affected. On FreeBSD I'm 99% certain" I would love a 2nd opinion, but based on this it would appear zvols should be ok?

PowerEdge R510 The solution for me was to set the NVRAM clear jumper, power the server on, let it post, power it off, move the jumper back. It seems on some (Dell at least) servers, removing UEFI boot entries doesn't completely remove them, and the UEFI storage eventually fills up, which is...

Ahhh ok, than you sir! I thought I was missing something ;-)

Just did a fresh install of PVE. Going over the stock cron jobs I found this: In /etc/cron.d/zfsutils-linux # TRIM the first Sunday of every month. 24 0 1-7 * * root if [ $(date +\%w) -eq 0 ] && [ -x /usr/lib/zfs-linux/trim ]; then /usr/lib/zfs-linux/trim; fi Actually works out to the...