Re: Testing with 2.6.19-rc5

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On 11/15/06, Andrew Morton <akpm@xxxxxxxx> wrote:
On Wed, 15 Nov 2006 14:45:27 +0000
"Andrew Lyon" <andrew.lyon@xxxxxxxxx> wrote:

> Andrew,
>
> You asked me to test if the issues I reported (Re: JMicron 20360/20363
> AHCI Controller much slower with 2.6.18 / Re: SATA CD/DVDRW Support in
> 2.6.18? / Re: Problems with Samsung SH-W163A SATA CD/DVDRW JMicron
> 20360/20363 2.6.18.1) were still present with 2.6.19-rc5, I tried it
> today and ran into a very strange problem, the 4 400gb Samsung SATA
> HDs connected to ata_piix were detected as normal but the raid that
> they belong to failed to start, the raid system couldnt find any
> superblock at all.

You mean that the raid works in 2.6.18 but not in 2.6.19-rc5?   Ouch.

Yes, thats exactly what I mean, the disks are detected but the raid
does not start because no superblocks are found.

What sort of raid setup are you using?

Raid 5, 4 x 400gb Samsung SATA HDs all connected to ata_piix.

> Is it possible that the addressing of the sectors has changed such
> that the device data structure does not map to the on disk data in the
> same way as it did with 2.6.18.x ?

Sounds unlikely.  More likely we're reading junk from the disks.

> unfortunately they drives are not
> partitioned, just added straight to the raid, otherwise checking the
> partition table would be a good test.
>
> I had a idea about taking a copy of a few kbs of data from each drive
> using both kernel versions and comparing them,

Good idea.

> but if the raid is
> started under 2.6.18 its possible the data would change anyway.. so I
> dont think that would work.

Do you actually need to start the raid under 2.6.18?  Shut the raid down,
take a copy of the first 32k of each disk, then boto 2.6.19-rc5 and do the
same?

Actually you are right, I will disable the raid and do the 32k test as
soon as I can, hopefully tonight.

Andy


> Any suggestions? I really want to complete testing of the two issues I
> reported..

Thanks.

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