On Tue, Aug 5, 2008 at 8:22 AM, Keld Jørn Simonsen <keld@xxxxxxxx> wrote: > On Tue, Aug 05, 2008 at 06:53:12AM -0500, Jon Nelson wrote: >> On Tue, Aug 5, 2008 at 5:14 AM, Keld Jørn Simonsen <keld@xxxxxxxx> wrote: >> > Speed up raid10 resync, especially for 'far' layout >> > >> > This patch speeds up resync for raid10, especially for the 'far' >> > layout, where reading is done in 32 MiB increments and the moving of >> > heads is therefore much reduced compared to the previous 2 MiB size, >> > nd the 'far' property of striping read can be employed. >> > >> > A speed up of more than 50 % has been reported. >> >> Actually, the time taken to 'check' the array was reduced by more than 50%. > > Which corresponds to a speed up of more than 100 %. > > Did you have any indications on whether there would still be room for > improvements? What was the speed on the individual disks compared to > their nominal speed? Generally, very good. At or above the posted speed limit. -- Jon -- 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
