On Tue, Apr 16, 2013 at 4:29 PM, Sašo Kiselkov <[email protected]>wrote:
> If you are IOPS constrained, then yes, raid-zn will be slower, simply > because any read needs to hit all data drives in the stripe. This is > even worse on writes if the raidz has bad geometry (number of data > drives isn't a power of 2). > Off topic slightly, but I have always wondered at this - what exactly causes non-power of 2 plus number of parities geometries to be slower, and by how much? I tested for this effect with some consumer drives, comparing 8+2 and 10+2, and didn't see much of a penalty (though the only random test I did was read, our workload is highly sequential so it wasn't important). Tim _______________________________________________ OpenIndiana-discuss mailing list [email protected] http://openindiana.org/mailman/listinfo/openindiana-discuss
