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SubjectRe: Corruption on database
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Hi Markus,

Markus Döhr <doehrm@aubi.de> writes:

> We're currently in the process switching our SAP R/3 systems over to linux.
> Database is SAPDB (former ADABAS). The size is about 125 GB. For storing RAW
> DEVSPACES are used (2 x RAID-5, 1 x RAID-1).
>
> We have problems with the database under high I/O load. The kernel doesn't
> report any hardware error (sync problems or the like) but the database often
> dumps with signal 11 doing a 'BAD DATA PAGE' on the RAW device what implies
> a full recover.
>
> Used is kernel 2.2.16-22SAPenterprise, a 'special' kernel from Redhat with
> some patches (Bigmem, semaphores, LFS etc.).
>
> Just curious if there are any known issues with RAW devices that are bigger
> than 2 GB and their behaviour under high/very high load. Due to the fact,
> that we have this problem on two nearly identical machines I assume that
> there's no hardware problem with the controller.
>
> The used hardware is Compaq ProLiant 5500 with 1.8 GB of RAM and 3way P-II
> 450 Xeon.

I do not think that this is Linux kernel related. There was a bug in
the SAPDB kernel with raw devices.

I have put our support mail address on this reply. Please follow up
with them.

Greetings
Christoph
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