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sysadmin/btrfs: make mount own section and extend it a bit

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To ensure it's clear for user that they should use UUIDs, and to
provide more clear instructions for those not accustomed to the CLI.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Thomas Lamprecht 2021-06-23 21:49:31 +02:00
parent d9bfc25147
commit 8dcb70bb24
1 changed files with 33 additions and 6 deletions
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39
local-btrfs.adoc
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@ -95,27 +95,54 @@ optional `-L` parameter, a label can be set.
Generally, the following modes are supported: `single`, `raid0`, `raid1`,
`raid10`.
Create a BTRFS file system on `/dev/sdb1`
Create a BTRFS file system on a single disk `/dev/sdb` with the label
`My-Storage`:
----
# mkfs.btrfs -m single -d single -L My-Storage /dev/sdb1
# mkfs.btrfs -m single -d single -L My-Storage /dev/sdb
----
Or create a RAID1 on `/dev/sdb1` and `/dev/sdc1`
Or create a RAID1 on the two partitions `/dev/sdb1` and `/dev/sdc1`:
----
# mkfs.btrfs -m raid1 -d raid1 -L My-Storage /dev/sdb1 /dev/sdc1
----
This can then be mounted or used in `/etc/fstab` like any other mount point.
Mounting a BTRFS file system
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
For example
The new file-system can then be mounted either manually, for example:
----
# mkdir /my-storage
# mount /dev/sdb1 /my-storage
# mount /dev/sdb /my-storage
----
A BTRFS can also be added to `/etc/fstab` like any other mount point,
automatically mounting it on boot. It's recommended to avoid using
block-device paths but use the `UUID` value the `mkfs.btrfs` command printed,
especially there is more than one disk in a BTRFS setup.
For example:
.File `/etc/fstab`
----
# ... other mount points left out for brevity
# using the UUID from the mkfs.btrfs output is highly recommended
UUID=e2c0c3ff-2114-4f54-b767-3a203e49f6f3 /my-storage btrfs defaults 0 0
----
TIP: If you do not have the UUID available anymore you can use the `blkid` tool
to list all properties of block-devices.
Afterwards you can trigger the first mount by executing:
----
mount /my-storage
----
After the next reboot this will be automatically done by the system at boot.
Creating a subvolume
^^^^^^^^^^^^^^^^^^^^