On Tue, Oct 12, 2010 at 02:57:56PM +0000, Jefferson Ogata wrote: > On 2010-10-12 14:52, Tino Schwarze wrote: > > I suppose(!) alignment doesn't matter that much (or at all) for RAID10 > > (which is the right choice for DB loads with only few disks). > > > > But that's just my gut feeling. > > My gut thinks your gut is wrong about that. :^) Why would RAID10 be > exempt? The PERC is still going to bunch up disk addressing into RAID > chunks. If your filesystem blocks aren't aligned with the chunk > boundaries, you're going to need two disks to seek to satisfy some read > requests, and four disks for some write requests.
Right. These disks could be doing other stuff instead of reading one another RAID chunk. So better always align to stripe size. Thanks, Tino. -- "What we nourish flourishes." - "Was wir nähren erblüht." www.tisc.de _______________________________________________ Linux-PowerEdge mailing list Linux-PowerEdge@dell.com https://lists.us.dell.com/mailman/listinfo/linux-poweredge Please read the FAQ at http://lists.us.dell.com/faq
