[NCLUG] sw raid, recovery after install

[Stephen Warren]

On 01/16/2013 04:07 PM, Michael Milligan wrote:
> On 01/02/2013 02:35 PM, Matt Rosing wrote:
>> Hi,
>>
>> I added a raid 5 to my computer with 3 identical drives. I mounted it. I 
>> moved files to it. It looks like it's working. Then I looked at 
>> /proc/mdstat and it says it's recovering:
>>
>> -------------
>> root at phoenix:/var/log# cat /proc/mdstat
>> Personalities : [raid6] [raid5] [raid4]
>> md0 : active raid5 sdb[0] sdd[3] sdc[1]
>>        2930274304 blocks super 1.2 level 5, 512k chunk, algorithm 2 
>> [3/2] [UU_]
>>        [========>............]  recovery = 40.6% (595347620/1465137152) 
>> finish=235.8min speed=61467K/sec
>>
>> unused devices: <none>
>> -----------
>>
>> Is it normal to be recovering a disk right after the raid is created? It 
>> could very well be that I set it up incorrectly.
> 
> If you didn't know to add "--assume-clean" to mdadm when you created the
> array, then yes.  (Assuming you did it manually.)
> 
> If you used the debian or ubuntu installer, then it's also normal.  It
> hasn't been "fixed" yet.  Witness my 6-year-old bug on the issue.
> 
> https://bugs.launchpad.net/ubuntu/+source/mdcfg/+bug/77470

Ugggh. I sincerely hope that never gets fixed, or e.g. RAID-1 array
scrubbing never has a chance of finding that the mirrors are in sync...