Re: IDE-RAID Drive Performance

[Nuno Alexandre <na@imaginere.dk>]

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On Tue, 30 Dec 2003 11:44:01 +0100 
Mr(s): Nicklas Bondesson wrote:

> Hi!
> 
> I think i'm getting really bad values from my disks. It's two Western
> Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected to a
> Promise TX2000 (PDC20271) card (RAID1 using ataraid under Linux 2.4.23).
> 
> The disks are setup with hdparm at boot time:
> 
> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda 
> /sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hdc
> 
> When running hdparm -tT I get the following:
> 
> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.46 seconds = 26.02 MB/sec
> 
> /dev/hdc:
>  Timing buffer-cache reads:   128 MB in  1.13 seconds =113.27 MB/sec
>  Timing buffered disk reads:  64 MB in  2.47 seconds = 25.91 MB/sec
> 
> Are these normal values? I don't think so. Please advise.
> 
> /Nicke

Hi.
This is what i get with a Maxtor 6Y120L0 (2MB cache):

/dev/hda:
 Timing buffer-cache reads:   1320 MB in  2.00 seconds = 659.44 MB/sec
 Timing buffered disk reads:  140 MB in  3.02 seconds =  46.40 MB/sec

Using:
-d1 -u1 -m16 -c3 -W1 -A1 -k1 -X70 -a 8192

I'm not using raid, its a single disk connected to IDE1 on the motherboard.

Maybe you can try those parameters and see if it helps :)
-- 
Best regards - Nuno Alexandre - na@imaginere.dk
Gpg: EA74637D - http://imaginere.dk - iM:ikaro@jabber.org

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