I was refering to bios reaching make_request in raid5.c .
I would be more precise.
I am dd'ing " dd if=/dev/md1 of=/dev/zero bs=1M count=1 skip=10"
I have added the following printk in make_request "printk ("%d:",bio->bi_size)"
I am getting sector sizes. 512:512:512:512:512....
I suppose they gathered in the elevator,
but still why so small ?
thank you
raz.
On 3/27/06, Neil Brown <neilb@xxxxxxx> wrote:
> On Monday March 27, raziebe@xxxxxxxxx wrote:
> > i have playing with raid5 and i noticed that the arriving bios sizes
> > are 1 sector.
> > why is that and where is it set ?
>
> bios arriving from where?
>
> bios from the filesystem to the raid5 device will be whatever size the
> fs wants to make them.
>
> bios from the raid5 device to the component devices will always be 1
> page (typically 8 sectors). This is the size used by the stripe cache
> which is used to synchronise everything.
>
> NeilBrown
>
--
Raz
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
