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| author |   Sebastian Parschauer <s.parschauer@gmx.de> | 2020-07-28 12:01:39 +0200 |
|---|---|---|
| committer |   Song Liu <songliubraving@fb.com> | 2020-08-02 23:03:51 -0700 |
| commit | ec164d07aa771370c7c24c1fa7f7692ad30f01cb (patch) | |
| tree | 6187f353fe1098d7b40d8668387526b797949e58 /Documentation/admin-guide/md.rst | |
| parent | md: fix max sectors calculation for super 1.0 (diff) | |
| download | linux-dev-ec164d07aa771370c7c24c1fa7f7692ad30f01cb.tar.xz linux-dev-ec164d07aa771370c7c24c1fa7f7692ad30f01cb.zip | |
md: register new md sysfs file 'uuid' read-only
Report the UUID of the MD array in the following format:
xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
This is useful if you don't want to wait for udev to identify array.
And it is also easy for script to monitor it with the format.
Signed-off-by: Sebastian Parschauer <s.parschauer@gmx.de>
[Guoqing: mention the change in md.rst]
Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Diffstat (limited to 'Documentation/admin-guide/md.rst')
| -rw-r--r-- | Documentation/admin-guide/md.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/admin-guide/md.rst b/Documentation/admin-guide/md.rst index d973d469ffc4..cc8781b96b4d 100644 --- a/Documentation/admin-guide/md.rst +++ b/Documentation/admin-guide/md.rst @@ -426,6 +426,10 @@ All md devices contain: The accepted values when writing to this file are ``ppl`` and ``resync``, used to enable and disable PPL. + uuid + This indicates the UUID of the array in the following format: + xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx + As component devices are added to an md array, they appear in the ``md`` directory as new directories named:: |