![]() ![]() So now you have some disks and are ready to try ZFS, you should understand the hierarchy of the ZFS storage architecture. The hierarchy of disks, vdevs, pools, datasets: The FreeBSD installer has an interface allowing ZFS as the root file system, allowing a bootable FreeBSD system on ZFS. Selecting the guided root on ZFS, install will permit graphical selection of disks to include in a pool. This is an easy way to explore ZFS features without an extensive hardware investment. This article will introduce new users to ZFS, and cover some of the new features in the upgrade. Until then a small script like this can help a lot.FreeBSD 13.0 imported OpenZFS 2.0 replacing the bespoke port that had served since 2007. ![]() Pushover support was even added recently but it will take quite some time until those versions are supported by all operating systems. If you prefer other ways of notifications then you should know that ZFS has a built-in notification tool (search for zed daemon). A simple script that might just safe the precious data on your server. */5 * * * * bash /usr/local/bin/zpoolStatusCheck.sh # and add a cron job that runs the script every 5 minutes cp zpoolStatusCheck.sh /usr/local/bin/zpoolStatusCheck.sh # copy the script If all works well you can also add it as a cron job to run it regularly. Now you can check this script by directly running it. The process to get those is described in the official documentation. If you want to send a pushover message you will also need to provide a Pushover toke and userkey. The paths for the log file and the ZFS bin can stay unchanged in most cases. First change the name of the pool to the one you want to check the status of. To use this script you have to provide some data by adapting the values of the variables at the top. #Openzfs scrub all pools fullI also uploaded the full script to my ZFS home server repository and will keep it up to date there. F "message=The status of pool $POOL does not seem to healthy" Įcho "$(date) - Zpool $POOL status is healthy" > $LOGFILE If thenĮcho "$(date) - Alarm - zPool $POOL is not healthy" > $LOGFILE Using this command with the precise output it is simple to write a script in combination with the Pushover API. Zpool status dataPool -x // checking only the pool called dataPool There is a simple switch for the status command to check the pool health.# zpool status -x // checking all pools Now to the monitoring of the pool health. I have used it in the past for smart home alerts from Home Assistant, for the backup alerts and for notifications from my 3D printer. I am already using a solution for alerts directly to my smartphone called Pushover. ![]() If it ever is not I want to know it as quickly as possible. Even though I do have backups for my server, and even build an alerting system for those backups I still wanted to make sure that my ZFS pool is always in a good condition. Building a ZFS alert – a healthcheck with popup messagesĮven if you regularly run a ZFS scrub there are still things that could go wrong. If you are looking to do that manually you can always run zpool scrub poolName. #Openzfs scrub all pools installIf you install open ZFS on a Ubuntu based system it automatically creates a cronjob that is running a scrub once a month (in my case in /etc/cron.d/zfsutils-linux). This process is a very important one that should run regularly, otherwise you will risk data loss like a certain Youtuber. Any error will then be fixed automatically. A ZFS scrub will go over all that data and find any of those errors (to a certain degree) by checking the data against the checksum. Faulty hardware of even cosmic radiance (no joke!) can cause errors in your data over time. No you do not need to go outside and start cleaning your pool □ Any data(block) in a ZFS filesystem has a checksum. The first important task any ZFS pool owner has is scrubing. Zpool status output for a raidZ1 pool Scrubbing the pool ![]()
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