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Amiga computer related discussion => Amiga Software Issues and Discussion => Topic started by: Amigaz on August 02, 2006, 09:17:26 PM

Title: Maxtransfer, Blocksize etc
Post by: Amigaz on August 02, 2006, 09:17:26 PM

Been wondering lately if my settings in Hdtoolbox are the right ones...

Using PFS3 on a SCSI hd connected to my UWSCSI controller on my Cyberstorm PPC

here's my settings

http://img488.imageshack.us/img488/47/grab2ju7.jpg

Title: Re: Maxtransfer, Blocksize etc
Post by: quenthal on August 02, 2006, 09:34:28 PM

Seems quite low - you could try with higher values, and if there is no problem sitck with them. I'm using currently 0xffffffff as Mask and 0x00ffffff as Max Transfer.  Block size depends on used filesystem, with SFS it is recommended to use 512, with PFS3 you might want to try 1024 or even 2048 (not so sure about this since I'm not using PFS3).

I recommend you to do some search on Maxtransfer here on a.org and aw.net, there's quite a lot of more exact information about these values. For example here (http://www.amiga.org/forums/showthread.php?t=23415).

Edit: You can change maxtransfer and mask on the fly without formatting, but changing blocksize requires format I think. First time I tried to change maxtransfer and mask with hdtoolbox they returned back to original values after boot, so they never changed. Using SCSI tools for Cyberstorm were able to do real changes.

Title: Re: Maxtransfer, Blocksize etc
Post by: Thomas on August 03, 2006, 07:39:24 AM

@AMIGAZ:

You settings are ok, but you obviously didn't read the PFS3 manual.

1. don't use CFS as identifier !  The corrct ID for PFS3 is PFS\03 (0x50465303). Go to Add/Update, remove PFS3, then add it again and when it asks you for the identifier, enter the correct value. Then change each PFS3 partition to that identifier, too.

2. Mask should be divisible by 4, so it should have a "C" at the end. Higher values than 0x7ffffffc make no sense. You don't have more than 2GB of RAM, do you ?

Regarding block size: PFS3 can only handle blocks of 512 bytes. Only if your device does not support 512 byte blocks (I don't know any), you can use 1024. Higher block sizes don't work.

Next time read the manual before you ask. It has a very detailed discussion of Mask and MaxTransfer and what they are for. It also discusses block sizes and instructs how to install PFS3 with the correct identifier.

Bye,
Thomas

Title: Re: Maxtransfer, Blocksize etc
Post by: quenthal on August 03, 2006, 10:39:50 PM

Quote

Thomas wrote:

2. Mask should be divisible by 4, so it should have a "C" at the end. Higher values than 0x7ffffffc make no sense. You don't have more than 2GB of RAM, do you ?

Hmm.. Thomas, what do you think about these findings?
http://www.amiga.org/forums/showthread.php?t=23415