On Sunday March 10, babydr@baby-dragons.com wrote:
>
> Hello Neil (& all) , make that
> 'mdadm -b --examine --scan /dev/'All devices in the array'
> Twyl , JimL
> Which gives you (gosh;-) the output being looked for :
>
> # mdadm -b --examine --scan /dev/sd[b-d]1
> ARRAY /dev/md0 level=raid5 disks=3 UUID=b285b144:ae0b561b:b5b55686:ed216a4c
> devices=/dev/sdb1,/dev/sdc1,/dev/sdd1
>
You know, it makes life *so* much easier when people answer their own
questions ... thanks for that :-)
I guess this indicates that the documentation could be improved.
mdadm --detail --brief /dev/md0
will print a prototype mdadm.conf line for /dev/md0.
mdadm --examine --brief /dev/sda1
will print out a prototype mdadm.conf line for the array that contains
/dev/sda1. The array device name (e.g. /dev/md1) will be a guess and
should be checked. Also you probably don't want the "devices=" part.
In this case it will only contain /dev/sda1
mdadm --examine --scan
will scan all devices described in /etc/mdadm.conf and print out
prototype mdadm.conf lines for them. This could well list bits of
arrays that are no longer active. Use the output with caution. When
--scan is used with --examine, it default to --brief (can be
overridden with --verbose). But obviously not when you give a device
name.
I would like
mdadm --detail --scan
to given mdadm.conf lines for all running arrays, but this really
means parsing /proc/mdstat which I have written any code for yet.
mdadm --examine --scan /dev/whatever
isn't really an intended usage. If you are giving a device, it
doesn't need to scan for anything.
Thanks for your feedback.
NeilBrown
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