SCSI CF slower than IDE CF...Why?

[lorddef]

I dunno if there are any good HD speed programs on the Amiga?

Probably not too much point as everything is pretty slow anyway, but it'd be fun to see a port of bonnie++

[Sandman]

The CF card that I am using is the A-Data Speedy 8GB (http://www.adata-group.com/EN/product_show.php?ProductNo=ACFCZZZBK)

It seems weird that I get the best performance with it alone on the WE SCSI first, then next alone on the A4000 IDE and worst performance on the WE SCSI along with the HD...... must be the IDE->SCSI adapter but that is rated @ 20mb/sec so I am at a loss.....
 :crazy:

Thanks for all of the replies......

[MozzerFan]

I dunno if there are any good HD speed programs on the Amiga?

Scsispeed from the diskspeed archive on aminet is pretty good. Also there is a diskspeed program that comes with SFS.

[alexh]

Most old disk speed programs are useless with modern drives. Either the data never leaves the CACHE or the transfer requests are that small that latency becomes more apparent than transfer rate.

[Damion]

Sandman wrote:
Ok, here is what I got.

WarpEngine set to no delay, no LUN scan, 100ns sychronous

Synchronous jumper might be set on the WarpEngine, but you also need to use something like HDInstTools to set the synchronous flag on the RDB of the CF card.

[darksun9210]

hmmm, i dunno, i wouldn't really trust sysinfo with more convoluted setups.
especially since it rates the 60GB 1.8" drive on the IDE port of an 040 powered A1200 at 1.89MB/s :-?  :roll:

however, it does rate the CF card on the Acard scsi bridge on the scsi bus of an A530 at 3.56MB/s  :-o  :lol:

however, you should be seeing speeds approaching 9MB/s for syncro scsi opperation on a warp engine...? have you got another decent CF card you can test with?

[Sandman]

I am starting to think that the majority of the problem is with the CF->IDE adapter as it was a inexpensive one and I know that it doesn't do DMA.

I am thinking now that it might be best to put the CF on the A4000 ide (to get rid of boot delay) and live with a slower transfer speed since I will just use it to transfer files.  Then I could put my CDRW on the SCSI->IDE adapter hooked to the WarpEngine and then have a nice, fast burner.

Sound about right?  Any other ideas appreciated....

Thanks

[rkauer]

 Using the CF on the IDE controller looks OK to me.

 And using the CDRW in the SCSI chain is a very good solution.

 But the SCSI>IDE bridge don't need have DMA (neither other SCSI device, for that matter), only the controller must have that capability.

[Damion]

Sandman wrote:
I am starting to think that the majority of the problem is with the CF->IDE adapter as it was a inexpensive one and I know that it doesn't do DMA.

That could definitely be a problem! Technically, my understanding is that the Acard handles DMA with the SCSI controller, therefore whether or not the CF adapter is wired for DMA should be of no consequence. However, if I disable the DMA jumpers on my CF adapter, the A2K won't boot with either an old GVP 2000 HC+8 controller, nor the TekMagic. On the A1200 (no DMA), the systen operates the exact same regardless of the DMA jumper.

With a DMA capable CF adapter and Sandisk Ultra II cards, SysInfo speed is around 9.5 MB/sec on the TekMagic. I'd say try another adapter first, I believe even most of the cheap ones are wired for DMA nowadays.

[hardlink]

Has anybody tried skipping IDE and testing a SCSI to CF adapter yet? I have a SCSI to PCMCIA peripheral somewhere that I can't find. With that, it is just a matter of plugging the CF card into a passive PCMCIA adapter.