On Wednesday March 22, aizvorski@xxxxxxxxx wrote: > Paul M. <paul <at> gpmidi.net> writes: > > > > > Couple questions related to some raid using some firewire disks: > > > > Is it possible to set the stripe size to 16+MB? > > > > Is there a way to force the raid driver to only access one disk at a time? > > > > Thanks, > > > > Paul > > Yes, it's possible - just change the #define MAX_CHUNK_SIZE > in linux/include/linux/raid/md_k.h and rebuild your kernel. I am > happily running an array with a 64MB chunk. > > Can some knowledgeable person explain if there is any downside to a very large > number in that define (as in, a few GB)? Does it use up any resources or can it > overflow any arithmetic somewhere in the kernel? Up to 2Gig should work without problems. More than that will cause overflow in the 0.90 superblock. With the version-1 superblock we should be able to support chunks upto a terrabyte (I think) but we would need a code-audit and a fair bit of fixing first. NeilBrown - 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
