Improving SATA disks performances ?
Gabriel Labelle
glabelle at optimized.org
Sat Aug 14 14:05:01 UTC 2004
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
>
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