Hi Alex, I enabled these settings in /etc/sysconfig/harddisks as you suggested : But it seems that the best values were already probed on system startup. Intel PIV 3GHz C (HT enabled) Asus P4C800-E Deluxe Corsair TWINX1024-3200LLPRO 2x 74GB SATA WD Raptor 10000 on the Intel ICH5-R SATA controller (IDE mode) : /dev/md0 (raid1) -> /boot /dev/md1 (raid0) -> / /dev/md3 (raid0) -> /home /dev/sda and /dev/sdb are the individual HDD. Default /etc/sysconfig/harddisks /dev/sda: Timing buffer-cache reads: 3664 MB in 2.00 seconds = 1833.20 MB/sec Timing buffered disk reads: 206 MB in 3.03 seconds = 68.09 MB/sec /dev/sdb: Timing buffer-cache reads: 3648 MB in 2.00 seconds = 1825.19 MB/sec Timing buffered disk reads: 206 MB in 3.02 seconds = 68.20 MB/sec /dev/md1: Timing buffer-cache reads: 3684 MB in 2.00 seconds = 1843.20 MB/sec Timing buffered disk reads: 410 MB in 3.01 seconds = 136.32 MB/sec /dev/md3: Timing buffer-cache reads: 3660 MB in 2.00 seconds = 1831.19 MB/sec Timing buffered disk reads: 226 MB in 3.02 seconds = 74.85 MB/sec Modified /etc/sysconfig/harddisks /dev/sda: Timing buffer-cache reads: 4016 MB in 2.00 seconds = 2009.31 MB/sec Timing buffered disk reads: 206 MB in 3.02 seconds = 68.13 MB/sec /dev/sdb: Timing buffer-cache reads: 3820 MB in 2.00 seconds = 1911.25 MB/sec Timing buffered disk reads: 206 MB in 3.03 seconds = 68.09 MB/sec /dev/md1: Timing buffer-cache reads: 3896 MB in 2.00 seconds = 1949.27 MB/sec Timing buffered disk reads: 410 MB in 3.01 seconds = 136.19 MB/sec /dev/md3: Timing buffer-cache reads: 3652 MB in 2.00 seconds = 1826.28 MB/sec Timing buffered disk reads: 226 MB in 3.01 seconds = 74.99 MB/sec It seems like the /home partition is much slower than / (almost half the speed). Is it simply because / is at the beginning of the HDD? And is there something I can do about it? Many thanks again Gabriel On Thu, 2004-08-12 at 16:29, Alexander Dalloz wrote: > Am Do, den 12.08.2004 schrieb Gabriel Labelle um 15:19: > > > I use the linux soft raid md driver on my system and I would like to make > > sure I get the best from my hardware. > > > What should I check and/or do (hdparm options, etc.) in order to > > really optimize disks/raid performances on this FC2 workstation? > > > Gabriel > > Normally the best values are probed at boot up automatically. So no > manual adjustment with hdparm parameters are necessary. If you like to > play - and from your RAID0 setup it seems you don't care much about data > loss - you can try "EIDE_32BIT=3", "MULTIPLE_IO=16", "LOOKAHEAD=1". It > depends on your specific system whether these settings are already > active. Set the settings in /etc/sysconfig/harddisks when proofed to be > good. Take the warning at top of this file serious! > > Alexander >
