I've got software raid 1 for / and /home and it seems I'm not getting the right speed out of it.
Reading from md0 I get around 100 MB/sec
Reading from sda or sdb I get around 95-105 MB/sec
I thought I would get more speed (while reading data) from two drives. I don't know what is the problem.
I'm using kernel 2.6.31-18
hdparm -tT /dev/md0
/dev/md0: Timing cached reads: 2078
MB in 2.00 seconds = 1039.72 MB/sec
Timing buffered disk reads: 304 MB in
3.01 seconds = 100.96 MB/sechdparm -tT /dev/sda
/dev/sda: Timing cached reads: 2084
MB in 2.00 seconds = 1041.93 MB/sec
Timing buffered disk reads: 316 MB in
3.02 seconds = 104.77 MB/sechdparm -tT /dev/sdb
/dev/sdb: Timing cached reads: 2150
MB in 2.00 seconds = 1075.94 MB/sec
Timing buffered disk reads: 302 MB in
3.01 seconds = 100.47 MB/sec
Edit:
Raid 1
Best Answer
Take a look at the following article at nixCraf, HowTo: Speed Up Linux Software Raid Building And Re-syncing.
It explains the different settings in /proc that can be adjusted to influence the software raid speed. (Not just during building/syncing as the title suggests.)