> It seems the 1078 is simply not that quick with anything but pure > striping. Hardware RAID10 write performance appears only about 50% > faster than RAID6. The RAID6 speed is roughly 1/3rd of the RAID0 speed. > So exporting the individual drives as I previously mentioned and using > mdraid6 should yield at least a 3x improvement, assuming your CPUs > aren't already loaded down. Whatever the problem with the controller may be, it behaves quite nicely usually. It seems clear though, that, regardless of the storage technology, it cannot be a good idea to schedule tiny blocks in the order that XFS schedules them in my case. This: AG0 * * * AG1 * * * AG2 * * * AG3 * * * cannot be better than this: AG0 *** AG1 *** AG2 *** AG3 *** Yes, in theory, a good cache controller should be able to sort this out. But at least this particular controller is not able to do so and could use a little help. Also, a single consumer-grade drive is certainly not helped by this write ordering. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
