Re: Weird RAID/SATA problem [ once was Re: 2.6.17-mm3 ]

[Reuben Farrelly <reuben-lkml@reub.net>]

On 1/07/2006 10:51 p.m., Neil Brown wrote:
> On Saturday July 1, reuben-lkml@reub.net wrote:
> > > > md: super_written gets error=-5, uptodate=0
> > > >
> > > > messages on the console that didn't seem to want to stop...
> > > '5' == EIO 
> > >
> > > We try to write the superblock and we get EIO - something wrong somewhere.
> > >
> > > What sort of device are we writing to here?  What controller, what
> > > driver (if you know), what drives?
> > The two raid-1 disks are the Seagate ST380817AS SATA disks on the onboard
> > controller.  The motherboard is an Intel D945GNT motherboard.  See dmesg..
> >
> > > Can you write to the device without using md?
> > Yes.
>
> So... When md writes a superblock to this device, it reliably (or
> close to reliably) gets EIO.  When mkfs writes, it works fine.
>
> Only difference I can think of is still barriers... Does this patch
> make any difference?

You will be happy to know that yes, it does make a difference.

Applied to -mm4, RAID-1 now comes up with all arrays in sync and everything 
looking good.  Tried it twice, and both times raid-1 came up perfectly with

md0 : active raid1 sdc2[1] sda2[0]
      24410688 blocks [2/2] [UU]
      bitmap: 0/187 pages [0KB], 64KB chunk

for each md.

reuben
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