Re: Too many levels of symbolic links
On Fri 22 Jan 2021 at 08:06:37 (+0100), steve wrote:
> Le 21-01-2021, à 20:41:05 -0600, David Wright a écrit :
>
> > I always archive the output of udevadm for my disks (actually
> > I just copy the /run/udev/data/b8\:* files).
>
> I don't understand.
I keep a log for each of my hard drives, its acquisition, SMART
history, partitioning, filesystems, usage, problems, etc.
At the end of my opinions come the facts, the output of
udevadm info --query=all --name=/dev/sdX and
udevadm info --query=all --name=/dev/sdXN for all N.
By that means, I have information available for a drive even
when its host is powered off, or the drive is in storage.
When I edit said log file on the system that it attaches to,
I could update all the udevadm information by removing the
old version and then appending it again by running udevadm
several times. But instead I usually copy in the appropriate
subset of files /run/udev/data/b8\:* that contain almost all
the same information, just for convenience as I'm already in
an editor. Here's a small sample (pruned with grep) of that
information being obtained from each of those sources:
$ for j in '' 1 2 3 4 5 6 ; do udevadm info --query=all --name=/dev/sda$j ; done | grep -e 'ID_FS_UUID='
E: ID_FS_UUID=9a3fa215-a749-47f4-a33e-5708097634b2
E: ID_FS_UUID=10358228-7f4b-49ec-8864-2547e27bccdb
E: ID_FS_UUID=33c3cbeb-ee4b-4a21-9899-49e546f024de
E: ID_FS_UUID=98f15f4c-e3fc-45f3-aa15-3774e012e996
$
$ grep -e 'ID_FS_UUID=' /run/udev/data/b8\:?
/run/udev/data/b8:3:E:ID_FS_UUID=9a3fa215-a749-47f4-a33e-5708097634b2
/run/udev/data/b8:4:E:ID_FS_UUID=10358228-7f4b-49ec-8864-2547e27bccdb
/run/udev/data/b8:5:E:ID_FS_UUID=33c3cbeb-ee4b-4a21-9899-49e546f024de
/run/udev/data/b8:6:E:ID_FS_UUID=98f15f4c-e3fc-45f3-aa15-3774e012e996
$
> > Does mdadm have a
> > equivalent manner of displaying its configuration?
Not having used it, I wondered whether mdadm could effortlessly
"brain-dump" in a similar manner to either of these methods.
Cheers,
David.
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