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Determine block device from md device

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Sorry if this is obvious but I cant quite nail it down.

 

I have a need for a thing I am doing to find the device name and disk serial starting knowing either "/mnt/disk4" or "/dev/md4" from the shell

 

Does anyone know how to get for example "/dev/sdb1"  from this?

 

 

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I have tried I think all the obvious ways although I still think i missed the one obvious one that works

 

lsblk /dev/md4
NAME MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
md4    9:4    0  3.7T  0 md   /mnt/disk4

 

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grep -A1 '"disk4"' /var/local/emhttp/disks.ini

or if you want only the device designation

grep -A1 '"disk4"' /var/local/emhttp/disks.ini | grep -Po 'device="\K[^"]+'

 

Edited by bonienl

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That is excellent thank you very much. I would not have thought to do it like this at all.

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hehe

Out of curiusoty i never did find a way to do this by query /proc. Any idea if this data is in there somewhere?

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@limetech can you confirm if this is indeed in `proc` just so I can close this thread down as solved and anyone else that happens upon it knows the definitive answer.

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I have never seen it as part of "proc", but of course I am not limetech 😉

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yeah i dont think it is there either but i suspect this thread will hang about for years and hit first page on google since its so niche.

 

(anyone else find themselves answering their own question via google in old forum posts... i do more than I care to admit)

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