Followup to: <20040726213811.GA17363@xxxxxx>
By author: Jim Paris <jim@xxxxxxxx>
In newsgroup: linux.dev.raid
>
> > Thus, if you have used RAID-6 and have good or bad experiences, I'd
> > like to know them as soon as possible.
>
> Just tried setting up a RAID-6 on a new server, and I'm seeing
> complete filesystem corruption.
>
> I have 6 250GB disks, and want them all in the array. I've created it
> degraded, with the first disk missing, since that disk temporarily
> holds the system.
>
> Using kernel 2.6.7, mdadm 1.6.0, I did something like this:
>
> # mdadm --create /dev/md1 --level=6 --chunk=128 --raid-devices=6 missing /dev/hd{g,i,k,m,o}2
>
> which gives me:
>
> md1 : active raid6 hdo2[5] hdm2[4] hdk2[3] hdi2[2] hdg2[1]
> 976269312 blocks level 6, 128k chunk, algorithm 2 [6/5] [_UUUUU]
>
Okay, found the messages...
Can you create failures by creating a full array and then fail out
drives? That would rule out problems with the way mdadm creates the
array.
**** When the array is just created, it's not synchronized!!! ****
Thus, when the array is first created it needs to finish synchronizing
before it's usable. My current guess based on what I've seen so far
is that it's a bug in mdadm in creating arrays with exactly 1 missing
drive, as opposed to a kernel bug.
-hpa
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