Hi,

As some people (the ones who helped me configure it) here know, I have an AVA 1505 (compatible with AHA 152x) SCSI controller. It is an ISA controller.

After lots of hassles in setting it up, I have finally managed to get it to work and started attaching disks to it. I have a number of 18GB (Seagate and IBM) disks which I am using. All disks are capable of a sustained transfer rate of AT LEAST 15MB/s.

I tested the drives with hdparm -t , and for each disk, regardless of make, I get 1.33MB/s. I get that figure regardless of whether there is only one disk attached or two...

Next, I crated a software RAID-0 device, and I was hoping that this will add to the performance (striping and all). I formated the /dev/md0 and then did a hdparm -t /dev/md0 and guess what I got as a result?? Yep, 1.33MB/s.

I have two questions:

1.) Am I right in using hdparm to test the speed of these disks? I know that it is used for *tuning* the IDE drives, but I think that it is possible to test the disks (just the throughput) by using hdparm, even if they are SCSI?

2.) If I am right in 1.) , then why is the performance so horrendous? I know that I am using an ISA card, but the max throughput of ISA is 8MB/s, on the Adaptec site it says that the card can do about 7MB/s max. It is RAID performance especially that is worrying me, since it brought about no performance jump whatsoever.

Anyone has any ideas on this, please share them with me, I am somewhat stumped.

Thanks!!!

a very. very shameful bump. I've been buggering aroud with it the whole night, and for the love of God I can not extract anything more that 1.33MB/s from this thing. There must be more in it...

I have a similar problem.. I have a SAF (DTC) 3510 ISA scsi II card in a ibm pentium II box. scsi II is a minimum 10meg/second I thought... (the scsi II internal bus on my 8 -yearold pm7500 is shows up as 25meg/sec and the external scsi I bus is 5 meg/sec with YDlinux-actual performance I don't know.)

- any way the max tranfer I can get on the ibm box is 1.2kb/sec and that is under windows. Maybe it is a bottle neck in the hardware isa/pci bridge. But I also am very disspointed in the performance

I haven't yet tried to get linux to recognize it as I can't find a driver for it yet.... I was going to try a 1505 or 1515 driver since that is what windows usually recognizes it as.

Has anyone had any experince with this 3510 card?

thanks, mike