I've spent the last couple of days doing some googling, and my goodle-fu seems to have deserted me at the moment. I'm looking for some guides and/or words of wisdom on how to partition disks with optimal alignment for RAID devices, and also the same for laying file systems on those devices. I've just (re)created a 15 drive RAID 6 array, and I've partitioned the disk, and I'm building the array on partition 1, which I see starts at block 63 - I am guessing that this is non-optimal? Is there a magic formula that can be used to work out what the optimal starting block on the disk should be, so that we can avoid (or at least reduce) the read/modify/write penalty on the physical drives? Is there also a magic formula for doing the same for file systems laid down on a RAID device? I guess that this would depend on the type of superblock used, since there seems to be different locations (start, end, start +4k) for it. I've read thru the manual pages (shocking I know), and I can't see anything mentioned in there, and there's certainly no --optimal-alignment option there (any chance for next version - lol). Can someone point me in the direction of some reading about this please? Thanks. Graham -- 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
