ZFS tuning/usage on Qubes OS

[disclose-mushy]

@Euwiiwueir

See:

recordsize isn’t applicable to qubes, because qubes use zfs volumes not filesystems. recordsize is for filesystems. I think the analog for volumes would be volblocksize.

Sorry for the confusion. I use file-reflink because ZFS driver leaks VM names onto disk, so recordsize is applicable in that case.

@Euwiiwueir

I have been using the default lz4, but @likeafox makes a compelling point IMO:

Wouldn’t that also apply to the official Qubes OS backups tool, as it allows backups to be compressed? Maybe the storage domain could fix this, idk.

@Euwiiwueir

Can you say more about what you’re observing?

I have accumulated about 40% Fragmentation over 2 months of usage at 128KiB recordsize.