Roch Bourbonnais wrote: > > Le 20 juin 07 à 04:59, Ian Collins a écrit : > >>> >> I'm not sure why, but when I was testing various configurations with >> bonnie++, 3 pairs of mirrors did give about 3x the random read >> performance of a 6 disk raidz, but with 4 pairs, the random read >> performance dropped by 50%: >> >> 3x2 >> Block read: 220464 >> Random read: 1520.1 >> >> 4x2 >> Block read: 295747 >> Random read: 765.3 > > Did you recreate the pool from scratch or did you add a pair of disk > to the existing mirror ? > If starting from scratch, I'm stumped. But for the later, the problem > might lie in the data population. > The newly added mirror might have gotten a larger share of the added > data and restitution did not target all disks > evenly. > >From scratch. Each test was run on a new pool with one filesystem.
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