From: Michael Evans <mjevans1983@gmail.com>
To: Piergiorgio Sartor <piergiorgio.sartor@nexgo.de>
Cc: linux-raid@vger.kernel.org
Subject: Re: Device role question
Date: Fri, 26 Feb 2010 21:56:02 -0800 [thread overview]
Message-ID: <4877c76c1002262156k6675877am79a7da9b63446dc7@mail.gmail.com> (raw)
In-Reply-To: <20100226142331.GA2328@lazy.lzy>
On Fri, Feb 26, 2010 at 6:23 AM, Piergiorgio Sartor
<piergiorgio.sartor@nexgo.de> wrote:
> Hi all,
>
> checking randomly the component of some RAID-10 arrays
> (two disks each), with "mdadm -E /dev/sdXY", I noticed
> the following.
>
> There is an entry reported, called "Device Role".
>
> On one array, the components are defined, respectively, as:
>
> Active device 0
> Active device 1
>
> On another two arrays, it's a bit different.
>
> Active device 0
> spare
>
> Why is it "spare" (all are RAID-10 f2)?
>
> Does it make any difference one or the other role, in
> this type of RAID?
>
> On the other hand, "mdadm -D /dev/mdX" does not seem
> to give any hint on the different roles.
>
> Thanks,
>
> bye,
>
> --
>
> piergiorgio
> --
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>
Spare should mean that it is not currently a synced member of the
array; in other words a hot-spare. As I recall raid10 cannot
currently be grown (or /may/ only be grown with VERY recent
tools+kernels); did you maybe create a single device raid10 and try to
grow it?
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next prev parent reply other threads:[~2010-02-27 5:56 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-26 14:23 Device role question Piergiorgio Sartor
2010-02-27 5:56 ` Michael Evans [this message]
2010-02-27 8:08 ` Piergiorgio Sartor
2010-02-27 8:55 ` Michael Evans
2010-02-27 9:10 ` Piergiorgio Sartor
2010-02-28 3:34 ` Michael Evans
2010-02-28 10:38 ` Piergiorgio Sartor
2010-02-28 4:41 ` Neil Brown
2010-02-28 10:35 ` Piergiorgio Sartor
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