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Re: Add a 3rd drive to a existing raid1 (not as spare)

thanks but

# mdadm --add /dev/md1 --raid-devices=3 --spare-devices=0 /dev/sde1
mdadm:option --raid-devices not valid in manage mode

# mdadm --add /dev/md1 --spare-devices=0 /dev/sde1
mdadm:option --spare-devices not valid in manage mode

# mdadm --grow /dev/md1 --raid-devices=3 --spare-devices=0
mdadm:option --spare-devices not valid in grow mode

Am 14.04.2015 12:07, schrieb Darac Marjal:
> On Tue, Apr 14, 2015 at 11:42:22AM +0200, basti wrote:
>> Hello
>> I want to add a 3rd drive to a raid 1 array (for disaster backup, the
>> drive will be connectet once a week).
>> I dry:
>> mdadm --add /dev/md1 /dev/sde1
>> when I fail the drive there is a message
>> FailSpare event detected on md device /dev/md/1, component device /dev/sde1
>> How can I add the 3rd drive as "real drive" and not as spare?
> Looking at the mdadm manpage (i.e. I've not tried this myself), you
> could try being moew explicit about things:
> mdadm --add /dev/md1 --raid-devices=3 --spare-devices=0 /dev/sde1
> (Note however that the manpage I'm reading - the one in Wheezy - seems a
> little unsure whether the option is --raid-devices or --raid-disks).
> I think, also, you can convert /dev/sde1 from "spare" to "live" by
> issuing:
> mdadm --grow /dev/md1 --raid-devices=3 --spare-devices=0
> One last thing to be aware of. If you DO set up your three-disk RAID1
> and then take the "backup" drive out of the set, be aware that that will
> mark the RAID as "degraded" and expect to get warnings to that effect.
> There doesn't appear to be a way to re-mark a device as spare so, to
> cleanly remove it, you will need to mark it as faulty (mdadm /dev/md1 -f
> /dev/sde1). I don't know, off-hand, if this will affect the backup,
> though.
>> Best Regards
>> -- 
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