Re: Very poor latency when using hard drive (raid1)

2013-04-19 Thread Jan Kara
On Mon 15-04-13 11:59:59, l...@tigusoft.pl wrote: > There are 2 hard drives (normal, magnetic) in software raid 1 > on 3.2.41 kernel. Any possibility in trying a newer kernel? Like 3.8 / 3.9? > When I write into them e.g. using dd from /dev/zero to a local file > (ext4 on default settings), runn

Re: Very poor latency when using hard drive (raid1)

2013-04-16 Thread Michael Tokarev
15.04.2013 13:59, l...@tigusoft.pl пишет: > There are 2 hard drives (normal, magnetic) in software raid 1 > on 3.2.41 kernel. > > When I write into them e.g. using dd from /dev/zero to a local file > (ext4 on default settings), running 2 dd at once (writing two files) it > starves all other progra

Re: Very poor latency when using hard drive (raid1)

2013-04-16 Thread Mike Galbraith
On Tue, 2013-04-16 at 08:49 +0200, l...@tigusoft.pl wrote: > On 15/04/13 11:59, l...@tigusoft.pl wrote: > > There are 2 hard drives (normal, magnetic) in software raid 1 > > on 3.2.41 kernel. > > > > When I write into them e.g. using dd from /dev/zero to a local file > > (ext4 on default settings

Re: Very poor latency when using hard drive (raid1)

2013-04-15 Thread l...@tigusoft.pl
On 15/04/13 11:59, l...@tigusoft.pl wrote: > There are 2 hard drives (normal, magnetic) in software raid 1 > on 3.2.41 kernel. > > When I write into them e.g. using dd from /dev/zero to a local file > (ext4 on default settings), running 2 dd at once (writing two files) it > starves all other progr