On Thu, Jul 23, 2009 at 2:54 PM, NeilBrown<neilb@xxxxxxx> wrote:
> On Fri, July 24, 2009 4:50 am, Aldo Foot wrote:
>> I have a raid setup from which I physically removed a hard drive.
>> The array has three good active physical devices.
>> The output from mdadm shows "Raid Devices : 4" and "Total Devices : 3"
>> My objective is to removed all indications of the removed device. Note
>> that
>> the removed drive has no device name associated with it, so I cannot
>> remove it with mdadm.
>> Is it as simple as editing the /etc/mdadm.conf to "num-devices=3"? Would
>> that change the "State : clean, degraded " to just clean?
>> Is there something else that needs to be done to do this correctly?
>>
>> Here's what the config looks like at the moment:
>>
>> # mdadm -D /dev/md0
>> /dev/md0:
>> Version : 0.90
>> Creation Time : Fri Jul 10 02:39:32 2009
>> Raid Level : raid1
>> Array Size : 24000 (23.44 MiB 24.58 MB)
>> Used Dev Size : 24000 (23.44 MiB 24.58 MB)
>> Raid Devices : 4
>> Total Devices : 3
>> Preferred Minor : 0
>> Persistence : Superblock is persistent
>>
>> Update Time : Thu Jul 23 04:18:18 2009
>> State : clean, degraded
>> Active Devices : 3
>> Working Devices : 3
>> Failed Devices : 0
>> Spare Devices : 0
>>
>> UUID : fafe2b90:7ae3cb68:2011742e:3cbab095 (local to host
>> xxxxxxxxxx)
>> Events : 0.82
>>
>> Number Major Minor RaidDevice State
>> 0 8 17 0 active sync /dev/sdb1
>> 1 8 33 1 active sync /dev/sdc1
>> 2 8 8 2 active sync /dev/sda8
>> 3 0 0 3 removed
>>
>> # mdadm --detail --scan
>> ARRAY /dev/md0 level=raid1 num-devices=4 metadata=0.90
>> UUID=fafe2b90:7ae3cb68:2011742e:3cbab095
>>
>> any thoughts appreciated,
>
> mdadm --grow /dev/md0 --raid-devices=3
_______
That worked! nothing better than clean, accurate advice.
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[0] sda8[2] sdc1[1]
24000 blocks [3/3] [UUU]
For the record, changing "num-devices=3" in /etc/mdadm.conf did not work; the
array would not even start.
many thanks,
~af
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