SOLVED Cleanup oldest snapshots on freenas-boot

[RobertT]

So I recently got a warning that I had very little space on my freenas-boot. I determined that the issue was being held in snapshots. It turned out I had quite a few snaps dating back to 2014.. Nearly 50 of them. I decided to write a script to clean them up so I figure I would share what I used. This will keep the most recent 10 of each snapshot.

Code:

#!/bin/sh

RETENTION=10
FSLIST="freenas-boot/ROOT freenas-boot/grub"

for FS in $FSLIST ; do
 KILLLIST=`zfs list -H -rt snap -o name  -S creation | grep $FS | tail +$RETENTION | sort`
 for KILL in $KILLLIST ; do
  echo zfs destroy -R $KILL
  zfs destroy -R $KILL
 done
done

 

[nojohnny101]

Quick question, you were preforming "snapshots" on your boot volume? Why?

I didn't even know FreeNAS would let you do that, but it is simply sufficient to either manually or use a script to backup the config file at a frequency of your choosing. That is the only thing that changes on the boot volume.

 

[Ericloewe]

Quick question, you were preforming "snapshots" on your boot volume? Why?

I assume these are simply the boot environments, from all the updates.