Re: Multiplexed RAID-1 mode

2005-08-01 Thread Jeff Breidenbach
Hi Neil, Are you suggesting I do this? mdadm --create /dev/md0 --level=10 --raid-devices=2 \ --parity=f2 /dev/sdc1 /dev/sdd1 I just tried it and it appears dog slow - for example hdparm -t /dev/md0 claims 18MB/s, and I see a similar number in /proc/mdstat for resync speed.

RE: Multiplexed RAID-1 mode

2005-08-01 Thread Al Boldi
Neil Brown wrote: { On Sunday July 31, [EMAIL PROTECTED] wrote: Multiplexing read/write requests would certainly improve performance ala RAID-0 (-offset overhead). During reads the same RAID-0 code (+mirroring offset) could be used. During writes though, this would imply delayed mirroring.

Multiplexed RAID-1 mode

2005-07-31 Thread Al Boldi
Gordon Henderson wrote: { On Sat, 30 Jul 2005, Jeff Breidenbach wrote: I just ran a Linux software RAID-1 benchmark with some 500GB SATA drives in NCQ mode, along with a non-RAID control. Details are here for those interested. http://www.jab.org/raid-bench/ The results you get are

Re: Multiplexed RAID-1 mode

2005-07-31 Thread Neil Brown
On Sunday July 31, [EMAIL PROTECTED] wrote: Gordon Henderson wrote: { On Sat, 30 Jul 2005, Jeff Breidenbach wrote: I just ran a Linux software RAID-1 benchmark with some 500GB SATA drives in NCQ mode, along with a non-RAID control. Details are here for those interested.