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obitus1990
New Orleans, LA, USA

Posted Thu Mar 18, 2021 5:30 pm

I have two A3000s, both with an updated SCSI chip and fitted with a SCSI2SD v6. The speeds I get from them seems to be less than optimal, even in the heavily expanded one of the two (CS MK II /060/50MHz). At best, via SysInfo (not the best benchmark), I get 1.2 mb/sec. I had read on old newgroup posts (circa 1992-93) that the 3000 was capable of 5-6mb/sec speeds on the top SCSI HDDs of the day, and I would THINK that this flash-based solution, with a 10mb/sec transfer rate (on manufacturer's web site), would perform as well as, if not better than, an old SCSI spinning drive. If you are able to get better than 1.2mb/sec on your A3000, using its stock controller, please fill me in on your settings!

Thank you!

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A10001986
1986
Website

Posted Fri Mar 19, 2021 3:25 am

The theoretical max is 5MB/s for the onboard SCSI controller.

With SCSI2SD V6 (2020c) I get 3,7MB/s (probably depends on the SD card you are using).

Using an Acard ARS2000 and an SATA SSD I get 3,9MB/s.

User avatar
McTrinsic

Posted Fri Mar 19, 2021 4:26 am

Afair the 3000 featured SCSI-1. without Fast- or something.

SCSI-1 is 5mb/s.

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obitus1990
New Orleans, LA, USA

Posted Fri Mar 19, 2021 6:06 am

A10001986 wrote:
Fri Mar 19, 2021 3:25 am
The theoretical max is 5MB/s for the onboard SCSI controller.

With SCSI2SD V6 (2020c) I get 3,7MB/s (probably depends on the SD card you are using).

Using an Acard ARS2000 and an SATA SSD I get 3,9MB/s.
This is the same revision I have in my 3000s. I used the SD card that the seller provided (Inertial Computing) which was a generic 16 GB card, and, I had issues with it. So I swapped it for a brand new SanDisk Ultra 64GB rated at 10mb/sec, and with it, I am getting less than 2mb/sec.

What options do you have enabled on your SCSI2SD (synchronous vs async, parity, etc.)?

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A10001986
1986
Website

Posted Fri Mar 19, 2021 6:45 am

Synchronous, no parity IIRC.

On the SCSI2SD side, I enabled "SCSI 2" (again, IIRC) and nothing else (apart from termination).

User avatar
obitus1990
New Orleans, LA, USA

Posted Fri Mar 19, 2021 7:45 am

A10001986 wrote:
Fri Mar 19, 2021 6:45 am
Synchronous, no parity IIRC.

On the SCSI2SD side, I enabled "SCSI 2" (again, IIRC) and nothing else (apart from termination).
Thank you. Any particular max_transfer settings in the OS itself? What file system do you use?

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A10001986
1986
Website

Posted Fri Mar 19, 2021 7:53 am

3.1 and 3.9, ffs 45.13, maxtransfer 0xffffffff, mask 0x7fffffff, but both don't matter.

User avatar
A10001986
1986
Website

Posted Fri Mar 19, 2021 7:57 am

PS: I think the most important factor is block size, both in the SCSI2SD device config, and the setting on the Amiga (HDToolBox). I have 1024 on both.





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