On Tue Feb 05, 2013 at 01:49:07PM +0000, Brian Candler wrote:
> On Tue, Feb 05, 2013 at 01:40:14PM +0000, Brian Candler wrote:
> > On Tue, Feb 05, 2013 at 01:02:37PM +0000, Robin Hill wrote:
> > > > 1. The UUUU_ and [22/21] suggests that one disk is bad, but is that true?
> > > > And if so which one?
> > > >
> > > No, that's normal. A RAID5 (or RAID6) array is created in a degraded
> > > form, then the last disk(s) are recovered (it's the quickest way of
> > > getting the array ready for use).
> >
> > Ah I see. Thank you.
>
> The odd thing is, if I make a RAID6 I get [UUUUU] with no underscores?
>
> # cat /proc/mdstat
> Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
> md127 : active raid6 sdy[23](S) sdx[22] sdw[21] sdv[20] sdu[19] sdt[18] sds[17] sdr[16] sdq[15] sdp[14] sdo[13] sdn[12] sdm[11] sdl[10] sdk[9] sdj[8] sdi[7] sdh[6] sdg[5] sdf[4] sde[3] sdd[2] sdc[1] sdb[0]
> 61532835840 blocks super 1.2 level 6, 512k chunk, algorithm 2 [23/23] [UUUUUUUUUUUUUUUUUUUUUUU]
> [>....................] resync = 0.0% (850232/2930135040) finish=1607.7min speed=30365K/sec
> bitmap: 22/22 pages [88KB], 65536KB chunk
>
> unused devices: <none>
>
Looks like my mistake. The mdadm manual page indicates that it's only
RAID5 that is done this way. RAID6 will just do a full resync to
generate the parity.
Cheers,
Robin
--
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( ' } | Robin Hill <robin@xxxxxxxxxxxxxxx> |
/ / ) | Little Jim says .... |
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