* --assemble --scan --no-degrades assembles+run degraded RAID1?
@ 2013-07-19 22:47 Christoph Anton Mitterer
2013-07-20 1:51 ` NeilBrown
0 siblings, 1 reply; 2+ messages in thread
From: Christoph Anton Mitterer @ 2013-07-19 22:47 UTC (permalink / raw)
To: linux-raid
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Hi.
This is just some minor thing I've noticed:
I intentionally degraded a 2-device RAID1,... and try to auto assemble
it via:
--assemble --scan --no-degrade
It seems this not only assembles the array but also runs it, at least I
can write to the /dev/md/foo file.
I'd have expected that this does not work... but it does...
Did I get anything wrong here?
Cheers,
Chris.
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* Re: --assemble --scan --no-degrades assembles+run degraded RAID1?
2013-07-19 22:47 --assemble --scan --no-degrades assembles+run degraded RAID1? Christoph Anton Mitterer
@ 2013-07-20 1:51 ` NeilBrown
0 siblings, 0 replies; 2+ messages in thread
From: NeilBrown @ 2013-07-20 1:51 UTC (permalink / raw)
To: Christoph Anton Mitterer; +Cc: linux-raid
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On Sat, 20 Jul 2013 00:47:51 +0200 Christoph Anton Mitterer
<calestyo@scientia.net> wrote:
> Hi.
>
> This is just some minor thing I've noticed:
>
> I intentionally degraded a 2-device RAID1,... and try to auto assemble
> it via:
> --assemble --scan --no-degrade
>
> It seems this not only assembles the array but also runs it, at least I
> can write to the /dev/md/foo file.
>
> I'd have expected that this does not work... but it does...
>
>
> Did I get anything wrong here?
"--no-degraded" is a slight misnomer. It should be
"--no-degraded-unless-known-to-be-degraded".
The case that it stops is when you shut down the array with the array working
perfectly, remove a drive, the try to start the array up again.
In this case the array doesn't know that it is degraded, so "--no-degraded"
will stop it from being assembled.
This is useful when device discovery is slow or unreliable.
NeilBrown
>
>
> Cheers,
> Chris.
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2013-07-19 22:47 --assemble --scan --no-degrades assembles+run degraded RAID1? Christoph Anton Mitterer
2013-07-20 1:51 ` NeilBrown
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