Messages in this thread | | | From | Neil Brown <> | Date | Thu, 25 Dec 2003 11:27:19 +1100 | Subject | Re: 2.6.0, SiI3112, md raid1 problem: bio too big device (128 > 15) |
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On Wednesday December 24, mfedyk@matchmail.com wrote: > 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? > Not that I am aware of.
> > 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? > Not as yet, and as I am on leave, I'm not likely to do much for a while.
> > 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.
Andrew Morton has it so it should be in the next -mm or -pre or whatever he will call things.
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