On Thu, 2 Jul 2020, Tom wrote:
# create a zfs filesystem, with compression (optional)
zfs create -V 4G -b 4096 \
-o compression=lz4 -o logbias=throughput -o sync=always \
-o primarycache=metadata -o secondarycache=none \
rpool/swap
# make it into swap fs
mkswap -f /dev/zvol/rpool/swap
# turn it on
swapon /dev/zvol/rpool/swap
I would not recommend doing that. Swap on ZFS subvolume is not
stable on Linux yet and leads to lockups. I've done it myself and
eventually just placed a small SSD into my system and used that
exclusively for a large swap.
Without questioning Tom's experience, I'll only note that we have not
seen such lockups. Our systems with swap on ZFS run smoothly. I will,
however, keep an eye out for these symptoms.
--
Paul Heinlein
[email protected]
45°38' N, 122°6' W
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