Re: 2.6.0, SiI3112, md raid1 problem: bio too big device (128 > 15)

[Mike Fedyk]

On Wed, Dec 24, 2003 at 09:51:00PM +1100, Neil Brown wrote:
> This is a raid1 bug.
> Some block devices have limits on the sizes of io requests that they
> can handle, and advertise these limits with ->max_sectors and
> ->merge_bvec_fn (and a few others).  Any device MUST be able to accept
> a single page IO at any offset.

So, how can I determine the max io request support by my underlying devices
from userspace?

> When raid1 does a 'resync' it does all IO in 64K requests, ignoring
> the restrictions.
> Getting raid1 resync to handle the restrictions is non-trivial (I have
> code, but it is still buggy).

Do you have patches posted anywhere?

> A simple interim fix is to replace
> 
> #define RESYNC_BLOCK_SIZE (64*1024)
> 
> with
> 
> #define RESYNC_BLOCK_SIZE PAGE_SIZE

Then by all means, let's get this into -mm.

Then once the new resync code is ready it can be merged.
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