Cyberstorm PPC SCSI transfer rates ?

[zipper]

I'm really looking forward to achieve 30MB/s !

You'll probably need u160, better u320 drive to that speed.

[Framiga]

80 pins SCA are enough to achieve 36 Mbsec, with large transfers-256k-512k (PFS3).

Smaller transfers drops the speed a lot.

With another UW 68pins, i achieve lower tranfer/rate (about 25MBSec)

All this with the "optimistic" Scsibench with the CPU load meter DISABLED.

[billchase]

@Mugo
Try using UnitControl to set your parameters in Workbench
before benchmarking.  Unitcontrol will enable the settings
regardless of the RDB flags (until you reboot at least) You
should see a difference.

@Patrik
In my setups, the RDB flags have always overrided the SCSI
boot menu settings.  I really can't explain why.

C Snyder

[Mugo]

Hi again Guys,

Thank you all very much for all help.

I tried to mess a little with UnitControl, and managed to achieve better transfer rates with my harddrive.

Seems that 40MB/s Synchron, with 10 bytes handshake is the optimal setup for me.

SCSIBench reported 24MB/s rates in same sector readind with a block size of 16kB ! Previously it was about 11MB/s . . .

The problem is that i want to use UnitControl in my User-startup, but i cant get it to work from the shell.

It says "Commandline error", or something . . .

Do someone knows the right command arguments ? I'm trying something like this:

UnitControl cybppc.device 6 Wide Reselection FWC

Also, what are the best settings for the controller no the PPC Menu ?

And do someone knows if the SCSI controller on the Cyberstorm support 32-Bit Devices ? Would it be noticeably faster ?

I'll look for another drive, and would like to have a faster one if it's possible.

Oh God . .. so many questions :-P

Thanks guys !

[Piru]

If you take a look at the template: Device/K,...

/K means the option name must be present. Thus:

UnitControl Device cybppc.device 6 Wide Reselection FWC

[EDIT: fixed typo]

[Mugo]

Piru wrote:
If you take a look at the template: Decice/K,...

/K means the option name must be present. Thus:

UnitControl Device cybppc.device 6 Wide Reselection FWC

Ops ! My mistake. Seems that i'm overlooking somethings . . .  :roll:

Thank you Piru ! I'll try this again as soon as i have time.

[Ancalimon]

Is it possible to use SSD's with CSPPC?  I got myself a sata to scsi3 adapter and might try using an SSD with it. Is there anything to keep in mind when choosing which ssd to use? I had been using ide to scsi3 adapter with a 120gb Seagate ide hdd and was achieving around 35mb/sec transfer rates as far as I remember. What's the upper limit with CSPPC?

About termination... I had been using the Acard SCSIDE set to "termination on" and did not have any issues with just one ide drive. (my scs cdwriter was connected to A4000Ts scsi2 port) Now if I plug 1 ide hdd, 1 sata ssd, and a scsi2 cdwriter converted to 68pin what should the configuration be like? I also got myself a cable with active termination at the end. (Previously I was using an ordinary cable with one ide device)

[danbeaver]

Yes you can use an SSD with the CSPPC, but the UWSCSI will max out around 36 MB/s.  For that the type doesn't matter unless you feel autotrim is needed (not IMHO).

Termination with an UWSCSI should always be "Active and Wide" at both ends of the cable.  Unless you are running OS4.1, I would use the slow devices on the slow buses, i.e., the SCSI2 CDROM on the SCSI 4091 for quicker throughput.  Keeping devices on different buses allows copying to occur without bus slow downs and reversals.

[HammerD]

Is it possible to use SSD's with CSPPC?  I got myself a sata to scsi3 adapter and might try using an SSD with it. Is there anything to keep in mind when choosing which ssd to use? I had been using ide to scsi3 adapter with a 120gb Seagate ide hdd and was achieving around 35mb/sec transfer rates as far as I remember. What's the upper limit with CSPPC?

About termination... I had been using the Acard SCSIDE set to "termination on" and did not have any issues with just one ide drive. (my scs cdwriter was connected to A4000Ts scsi2 port) Now if I plug 1 ide hdd, 1 sata ssd, and a scsi2 cdwriter converted to 68pin what should the configuration be like? I also got myself a cable with active termination at the end. (Previously I was using an ordinary cable with one ide device)

If you have more than one device as you describe with the ACard - remove the two jumpers from the ACard and put active terminators on each end of the cable.  Then it will work - I have that config

[Dandy]

Hello Guys,

I have an A4000D, with a CPPC (060@50/604e@200), and a 17GB SCSI HD (68 pin) connected to it's onboard interface.

The problem is that i can only have transfer rates of 11MB/s top.

According to the CSPPC speccs its UW-SCSI II host has transfer rates of up to 40 mB/s.

...
This HD is the only device in the chain. The cable is attached to the CPPB by a connector in the middle of the cable, and there's an active terminator after it (on the end of the cable), then the other end goes to the HD, that have termination enabled.

Your SCSI chain should look like this:

active Terminator ---- CSPPC ---- HD ---- active Terminator

Everything works fine, but i feel it could be faster.

So i would like to know if any of you guys have a similar configuration, and can achieve higher transfer rates ?

If so, could you tell me your settings in the PPC firmware's menu ?
 . . .

Sorry, but I have a different config.
I also have SCSI-II devices like CD-ROM, CD-RW, DVD-RW and flatbed scanner in the chain - just the HDs run in UW-mode.
Upper 8 Bit of the UW-SCSI properly actively terminated behind the HDs and the lower 8Bit connected to the SCSI-II devices and properly actively terminated behind the last SCSI-II device.
As I am satified with the overall speed I never cared to measure the actual transfer rates.

[Kawazu]

Ops ! My mistake. Seems that i'm overlooking somethings . . .  :roll:

Thank you Piru ! I'll try this again as soon as i have time.

This is what I used in my startup when I had a csppc
Ofc you need to change the values to your liking but you can try my settings, just change the unit number number.

UnitControl Device=cybppc.device Unit=1 Period=20 Offset=10 Wide Reselection FWC