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Merge https://github.com/rancher/rancher.github.io/pull/835

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Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>
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Sven Dowideit 2017-07-14 08:45:04 +10:00
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10
docs/os/storage/using-zfs/index.md
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@ -26,7 +26,7 @@ $ lsmod | grep zfs
> *Note:* if you switch consoles, you may need to re-run `ros up zfs`.
#### Using ZFS
#### Creating ZFS pools
After it's installed, it should be ready to use. Make a zpool named `zpool1` using a device that you haven't yet partitioned (you can use `sudo fdisk -l` to list all the disks and their partitions).
@ -46,6 +46,14 @@ $ docker run --rm -it -v /mnt/zpool1/:/data alpine ls -la /data
To experiment with ZFS, you can create zpool backed by just ordinary files, not necessarily real block devices. In fact, you can mix storage devices in your ZFS pools; it's perfectly fine to create a zpool backed by real devices **and** ordinary files.
#### Using the ZFS debugger utility
The `zdb` command may be used to display information about ZFS pools useful to diagnose failures and gather statistics. By default the utility tries to load pool configurations from `/etc/zfs/zpool.cache`. Since the RancherOS ZFS service does not make use of the ZFS cache file and instead detects pools by inspecting devices, the `zdb` utility has to be invoked with the `-e` flag.
E.g. to show the configuration for the pool `zpool_1` you may run the following command:
> $ sudo zdb -e -C zpool_1
## ZFS storage for Docker on RancherOS
First, you need to stop the`docker` system service and wipe out `/var/lib/docker` folder: