2001-04-22 14:17:21

by raid

Subject: Maxtor 80gb slow on asus p2b-d ? (going to use it in raid5 config)

i'm going to build a raid5 config with 6*maxtor 80gb
mainbord is an asus p2b-d (with dual 450 and 512mb ram)
and 2 addon ultra66 promise controllers

i did some tests using hdparm (4.1)
and i get these result :

(hda and hdc are on the onboard controller)

/dev/hda:
Timing buffered disk reads: 64 MB in 4.94 seconds = 12.96 MB/sec

/dev/hdc:
Timing buffered disk reads: 64 MB in 4.94 seconds = 12.96 MB/sec

/dev/hde:
Timing buffered disk reads: 64 MB in 2.26 seconds = 28.32 MB/sec

/dev/hdg:
Timing buffered disk reads: 64 MB in 2.25 seconds = 28.44 MB/sec

/dev/hdi:
Timing buffered disk reads: 64 MB in 2.25 seconds = 28.44 MB/sec

/dev/hdk:
Timing buffered disk reads: 64 MB in 2.25 seconds = 28.44 MB/sec

kernel reports :
hda: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
UDMA(33)
hdc: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
UDMA(33)
hde: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
UDMA(66)
hdg: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
UDMA(66)
hdi: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
UDMA(66)
hdk: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
UDMA(66)

and i use hdparm -m16 -c1 -d1 -a8 on all hd's
so why do i only see 13mb/sec on the ultra33 controller
(i thought 28mb/sec would be possible on the ultra33 controller)

i also made a raid0 on the 6 disks
and this gives me :

/dev/md0:
Timing buffered disk reads: 64 MB in 2.13 seconds = 30.05 MB/sec

2001-04-22 14:17:30

by raid

Subject: Re: Maxtor 80gb slow on asus p2b-d ? (going to use it in raid5 config)

oops :

both tried kernel 2.4.4-pre5 (with ide patches)
and kernel 2.2.14pre12 (with ide and raid patches)

On Sun, 22 Apr 2001 [email protected] wrote:

> i'm going to build a raid5 config with 6*maxtor 80gb
> mainbord is an asus p2b-d (with dual 450 and 512mb ram)
> and 2 addon ultra66 promise controllers
>
> i did some tests using hdparm (4.1)
> and i get these result :
>
> (hda and hdc are on the onboard controller)
>
> /dev/hda:
> Timing buffered disk reads: 64 MB in 4.94 seconds = 12.96 MB/sec
>
> /dev/hdc:
> Timing buffered disk reads: 64 MB in 4.94 seconds = 12.96 MB/sec
>
> /dev/hde:
> Timing buffered disk reads: 64 MB in 2.26 seconds = 28.32 MB/sec
>
> /dev/hdg:
> Timing buffered disk reads: 64 MB in 2.25 seconds = 28.44 MB/sec
>
> /dev/hdi:
> Timing buffered disk reads: 64 MB in 2.25 seconds = 28.44 MB/sec
>
> /dev/hdk:
> Timing buffered disk reads: 64 MB in 2.25 seconds = 28.44 MB/sec
>
> kernel reports :
> hda: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
> UDMA(33)
> hdc: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
> UDMA(33)
> hde: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
> UDMA(66)
> hdg: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
> UDMA(66)
> hdi: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
> UDMA(66)
> hdk: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=158816/16/63,
> UDMA(66)
>
> and i use hdparm -m16 -c1 -d1 -a8 on all hd's
> so why do i only see 13mb/sec on the ultra33 controller
> (i thought 28mb/sec would be possible on the ultra33 controller)
>
> i also made a raid0 on the 6 disks
> and this gives me :
>
> /dev/md0:
> Timing buffered disk reads: 64 MB in 2.13 seconds = 30.05 MB/sec
>
>
>
> -
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