Messages in this thread | | | Date | Tue, 16 Dec 2003 12:58:53 -0800 | From | Mike Fedyk <> | Subject | Re: raid0 slower than devices it is assembled of? |
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On Tue, Dec 16, 2003 at 08:42:52AM -0800, Linus Torvalds wrote: > My personal guess is that modern RAID0 stripes should be on the order of > several MEGABYTES in size rather than the few hundred kB that most people > use (not to mention the people who have 32kB stripes or smaller - they > just kill their IO access patterns with that, and put the CPU at > ridiculous strain).
Larger stripes may help in general, but I'd suggest that for raid5 (ie, not raid0), the stripe size should not be enlarged as much. On many filesystems, a bitmap change, or inode table update shouldn't require reading a large stripe from several drives to complete the pairity calculations.
Probably finding the largest block of data the drive can return in one command would be a good size for a raid5 stripe. That's just speculation though. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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