And notice you can apply different readahead to: The raw devices (/dev/sda) The md device (/dev/mdX) Any lvm device (/dev/lvm_name/lvm_device) David Raz Ben Jehuda wrote: >read the blockdev man page > >On Thu, 2005-08-04 at 16:06 +0200, djani22@xxxxxxxxxxxxx wrote: > > >>Hi list, Neil! >> >>I have a little question because I'v got some performance problem... >>Is the RAID5 do any type of headahead with the default config? >>It is possible to disable the readahead? (if it is.) >>Or just the io_sched do that on the disks? >> >>How can I disable the whole headahead on top of the RAID5 array? >> >>The RAID5 can do multiple small (<4kb) reads of disks for the multithreaded >>read requests? >>(chunk size is 32k) >> >>Thanks for helping! >> >>Janos >> >>- >>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 >> >> -- - 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
