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Ubuntu/Debian: Enable discard on swap 

There is no need to be keeping old swap data around.  When Linux is done
with some data (or all data at swapon time), it can issue a discard,
which will cause ZFS to free those blocks.
Richard Laager 2019-03-30 08:02:40 -05:00
parent 3744568a90
commit 82ee65e5ae
2 changed files with 2 additions and 2 deletions
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2
Debian-Stretch-Root-on-ZFS.md

@ -425,7 +425,7 @@ The compression algorithm is set to `zle` because it is the cheapest available a
**Caution**: Always use long `/dev/zvol` aliases in configuration files. Never use a short `/dev/zdX` device name.
# mkswap -f /dev/zvol/rpool/swap
# echo /dev/zvol/rpool/swap none swap defaults 0 0 >> /etc/fstab
# echo /dev/zvol/rpool/swap none swap discard 0 0 >> /etc/fstab
7.3 Enable the swap device:

2
Ubuntu-18.04-Root-on-ZFS.md

@ -544,7 +544,7 @@ The compression algorithm is set to `zle` because it is the cheapest available a
**Caution**: Always use long `/dev/zvol` aliases in configuration files. Never use a short `/dev/zdX` device name.
# mkswap -f /dev/zvol/rpool/swap
# echo /dev/zvol/rpool/swap none swap defaults 0 0 >> /etc/fstab
# echo /dev/zvol/rpool/swap none swap discard 0 0 >> /etc/fstab
# echo RESUME=none > /etc/initramfs-tools/conf.d/resume
The `RESUME=none` is necessary to disable resuming from hibernation. This does not work, as the zvol is not present (because the pool has not yet been imported) at the time the resume script runs. If it is not disabled, the boot process hangs for 30 seconds waiting for the swap zvol to appear.