[EMAIL PROTECTED] wrote:
>Eyal Lebedinsky wrote:
>> the disks seem to be slow on their own
>> (hdparm says 1.36 MB/sec) and I expected some speedup when striped
>> (raid0). I got 2.8 MB/sec,
> Perhaps check that you can get more than 2.8MB/sec across the bus when running the
>discs as six/n separate devices
> simultaneously.
Good point. Here is what I get (with vmstat, MB/sec)
1 disk 1400
2 disks 2400
3 disks 3000
4 disks 3200
then no more improvement.
So, the bus is peaking at about 3MB/sec. I wonder why. On the other card
(I have two
identical SCSI cards in this machine) I get:
/dev/sda 5400
/dev/sdb 4200
both 7800
The bus can handle higher bandwidth. The CPU is not overly stressed
either.
Here is how these disks boot:
Dec 26 17:19:35 eyal kernel: ncr53c810-0-<1,0>: tagged command queue
depth set to 32
Dec 26 17:19:35 eyal kernel: Vendor: QUANTUM Model: PD210S
SUN0207 Rev: 492W
Dec 26 17:19:35 eyal kernel: Type:
Direct-Access ANSI SCSI revision: 02
Dec 26 17:19:35 eyal kernel: ncr53c810-1-<1,*>: FAST-5 SCSI 4.0 MB/s
(250 ns, offset 8)
Dec 26 17:19:35 eyal kernel: SCSI device sdc: hdwr sector= 512 bytes.
Sectors= 408574 [199 MB] [0.2 GB]
So it seems they simply are slow over the bus too, even though they are
SCSI-2.
--
Eyal Lebedinsky ([EMAIL PROTECTED])
