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Misu Egri
Asked: 2013-07-22 03:06:11 +0800 CST

Activate ZFS Snapshots

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I accidentally delete some files from my zfs pool and tried to mount the latest snapshots but i just figured out that i have no snapshots. How to activate the snapshots, how to configure it?

I am using Ubuntu 12.04.1 server and zfs 0.6.1, pool version is 28.

zfs

2 Answers

  1. Starting from Ubuntu 17.04 you can install zfs-auto-snapshot like this:

    sudo apt install zfs-auto-snapshot

    For Ubuntu versions prior 17.04 you could setup zfs-auto-snapshot to use automatic snapshots from repository

    sudo add-apt-repository ppa:zfs-native/stable; sudo apt-get install zfs-auto-snapshot

    or directly from github

    curl -L https://github.com/zfsonlinux/zfs-auto-snapshot/archive/master.tar.gz | tar xz -C /tmp/
pushd /tmp/zfs-auto-snapshot-master && sudo make install && popd && rm -rf /tmp/zfs-auto-snapshot-master

    By default it creates snapshots for each data set every 15 minutes and saves snapshot up to 1 year. However you could disable snapshots for specific dataset by setting com.sun:auto-snapshot dataset property to false

    sudo zfs set com.sun:auto-snapshot=false tank/tmp

    You could also use com.sun:auto-snapshot:... properties to tune auto snapshot behaviour. E.g. save snapshots daily for 31 days for tank/backup dataset:

    sudo zfs set com.sun:auto-snapshot=true tank/backup
sudo zfs set com.sun:auto-snapshot:monthly=false tank/backup
sudo zfs set com.sun:auto-snapshot:weekly=false tank/backup
sudo zfs set com.sun:auto-snapshot:daily=true tank/backup
sudo zfs set com.sun:auto-snapshot:hourly=false tank/backup
sudo zfs set com.sun:auto-snapshot:frequent=false tank/backup

    By default script saves:

    • frequent snapshots every 15 mins, keeping 4 snapshots
    • hourly snapshots every hour, keeping 24 snapshots
    • daily snapshots every day, keeping 31 snapshots
    • weekly snapshots every week, keeping 7 snapshots
    • monthly snapshots every month, keeping 12 snapshots
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  2. Best Answer

    If you have not taken any snapshots, you lost your data.

    To take snapshot, use zfs snapshot command

    http://docs.oracle.com/cd/E19253-01/819-5461/gbcya/index.html

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