On Thu, Mar 06, 2014 at 09:33:24PM +0000, Duncan wrote: > However, best snapshot management practice does progressive snapshot > thinning, so you never have more than a few hundred snapshots to manage > at once. Think of it this way. If you realize you deleted something you > needed yesterday, you might well remember about when you deleted it and > can thus pick the correct snapshot to mount and copy it back from. But > if you don't realize you need it until a year later, say when you're > doing your taxes, how likely are you to remember the specific hour, or > even the specific day, you deleted it? A year later, getting a copy from > the correct week, or perhaps the correct month, will probably suffice, > and even if you DID still have every single hour's snapshots a year > later, how would you ever know which one to pick? So while a day out, > hourly snapshots are nice, a year out, they're just noise.
I'm happy to share my script with others if that helps: http://marc.merlins.org/linux/scripts/btrfs-snaps Or for the list archives/google: ---------------------------------------------------------------------------- #!/bin/bash # By Marc MERLIN <marc_s...@merlins.org> # License GPL-2 or BSD at your option. # This lets you create sets of snapshots at any interval (I use hourly, # daily, and weekly) and delete the older ones automatically. # Usage: # This is called from /etc/cron.d like so: # 0 * * * * root btrfs-snaps hourly 3 | egrep -v '(Create a snapshot of|Will delete the oldest|Delete subvolume|Making snapshot of )' # 1 0 * * * root btrfs-snaps daily 4 | egrep -v '(Create a snapshot of|Will delete the oldest|Delete subvolume|Making snapshot of )' # 2 0 * * 0 root btrfs-snaps weekly 4 | egrep -v '(Create a snapshot of|Will delete the oldest|Delete subvolume|Making snapshot of )' : ${BTRFSROOT:=/mnt/btrfs_pool1} DATE="$(date '+%Y%m%d_%H:%M:%S')" type=${1:-hourly} keep=${2:-3} cd "$BTRFSROOT" for i in $(btrfs subvolume list -q . | grep "parent_uuid -" | awk '{print $11}') do # Skip duplicate dirs once a year on DST 1h rewind. test -d "$BTRFSROOT/${i}_${type}_$DATE" && continue echo "Making snapshot of $type" /sbin/btrfs subvolume snapshot "$BTRFSROOT"/$i "$BTRFSROOT/${i}_${type}_$DATE" count="$(ls -d ${i}_${type}_* | wc -l)" clip=$(( $count - $keep )) if [ $clip -gt 0 ]; then echo "Will delete the oldest $clip snapshots for $type" for sub in $(ls -d ${i}_${type}_* | head -n $clip) do #echo "Will delete $sub" /sbin/btrfs subvolume delete "$sub" done fi done ---------------------------------------------------------------------------- -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/ -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
