RAID-5 missing one disk.

RAID-5 missing one disk.

[Victor]

Is it still possible to use a RAID-5 array consisting out of 4 disks if
one is missing?

Re: RAID-5 missing one disk.

[Mads Peter Bach]

Victor wrote:
> Is it still possible to use a RAID-5 array consisting out of 4 disks if
> one is missing?

Yes. See 
http://www.ibiblio.org/pub/Linux/docs/HOWTO/other-formats/html_single/Software-RAID-HOWTO.html#ss2.4

-- 
Mads Peter Bach
Systemadministrator,  Det Humanistiske Fakultet, Aalborg Universitet
Kroghstræde 3 - 5.111, DK-9220 Aalborg Øst - (+45) 96358062
# whois MPB1-DK@whois.dk-hostmaster.dk

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Re: RAID-5 missing one disk.

[Victor]

Ok, so is it possible to build such an array?
I have 3 empty disks and 1 full of data. I would like to use the 3 disks to build the array, copy the
data from the full one into the array and then add the now empty disk. I read something of "degraded"
arrays, but I haven't seen a self-explanatory howto about this anywhere.

Mads Peter Bach wrote:

> Victor wrote:
> > Is it still possible to use a RAID-5 array consisting out of 4 disks if
> > one is missing?
>
> Yes. See
> http://www.ibiblio.org/pub/Linux/docs/HOWTO/other-formats/html_single/Software-RAID-HOWTO.html#ss2.4
>
> --
> Mads Peter Bach
> Systemadministrator,  Det Humanistiske Fakultet, Aalborg Universitet
> Kroghstræde 3 - 5.111, DK-9220 Aalborg Øst - (+45) 96358062
> # whois MPB1-DK@whois.dk-hostmaster.dk
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html


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Re: RAID-5 missing one disk.

[Mads Peter Bach]

Victor wrote:
> Ok, so is it possible to build such an array?

Yes.

> I have 3 empty disks and 1 full of data. I would like to use the 3 disks to build the array, copy the
> data from the full one into the array and then add the now empty disk. I read something of "degraded"
> arrays, but I haven't seen a self-explanatory howto about this anywhere.

Install mdadm (http://www.cse.unsw.edu.au/~neilb/source/mdadm/) and read the 
mdadm manpage (search for 'To create a "degraded" array').

-- 
Mads Peter Bach
Systemadministrator,  Det Humanistiske Fakultet, Aalborg Universitet
Kroghstræde 3 - 5.111, DK-9220 Aalborg Øst - (+45) 96358062
# whois MPB1-DK@whois.dk-hostmaster.dk

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