[GTALUG] Raid 10 repair question

[o1bigtenor]

On Tue, Feb 17, 2015 at 9:19 PM, William Park <opengeometry at yahoo.ca> wrote:

> Disk failed last September, and you're replacing it now?  Boy, you got
> balls!
>
> You are better off to use whatever utility you used in the first place.
> Manual typing would go something like
>     man mdadm
>     cat /proc/mdstat
>

understand above commands


>     mdadm -D -v /dev/md0
>

what does this command do/mean?


>     mdadm /dev/md0 --add /dev/sdx
>

(I understand I will need a different letter instead of the x)
what does this command do/mean?


> where
>     /dev/sdx is the new disk.  Here, the new device should be the "same"
>     as the old.  If the old was a partition (eg. /dev/sda1), then the
>     new should be a partition.  If the old was entire device (eg.
>     /dev/sda), then the new should be entire device also.
> --
>
I am not asking the questions to be confrontational just have learned that
typing in
commands the results of which you do not know or the effect you do not
know/understand
can have large effects.

(In the past I have too often totally borked my system and I really don't
want to take two
weeks from my life and spend all day trying to reestablish things.)

Thanking you for your interest and assistance!

Dee


> William
>
>
> On Tue, Feb 17, 2015 at 03:42:07PM -0600, o1bigtenor wrote:
> > Greetings
> >
> > I have been running a raid 10 array for almost 3 years.
> >
> > Last September on a reboot (forced by Firefox and kernel memory
> interaction
> > problems) came up with one of the drives being listed as DOA.
> > The raid array has continued to run on 3 drives although on reboots there
> > is much complaining from whatever in the boot up process.
> > I had the replacement drive sent to me and today I installed the drive.
> >
> > I was under the assumption that the raid array would rebuild itself upon
> > startup with a new drive (4th out of 4).
> >
> > This did not happen.
> >
> > I am running Debian Jessie (testing) and have the whole time in question.
> > I can mount the array and it is visible.
> > I'm looking at backing up the array (on blu-ray discs) but as I'm now to
> > circa 45 GB of data and I was at about 22 GB when I last did a backup
> this
> > is going to be a momentous event.
> >
> > How do I ask mdadm to include this new drive into the array? (Without
> > borking everything!! I have found lots of instructions on how to create
> but
> > none in an hour of trying different search phrases on how to rebuild or
> how
> > to cause the array to rebuild itself. I have only been able to find
> > instructions for when the array is totally sick and I'm not there (yet -
> -
> > - grin!) but I don't want to wait until another drive craps out to get
> > things going.)
> >
> > TIA
> >
> > Dee
>
> > ---
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>
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