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- From: gasman1@netcom.com (David A. Silva)
- Subject: Re: ADAPTEC 1542B OR ULTR
- Message-ID: <1993Jan26.092736.9629@netcom.com>
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- X-Newsreader: TIN [version 1.1 PL8]
- References: <1736.235.uupcb@yob.sccsi.com>
- Date: Tue, 26 Jan 1993 09:27:36 GMT
- Lines: 38
-
- Reginald Hirsch (reginald.hirsch@yob.sccsi.com) wrote:
- : TO: gasman1@netcom.com (David A. Silva)
- : -> I have an Adaptec 1542B. I also have an Ultrastor 14F. The Adaptec is
- : -> hands down winner. The Adaptec card and ASPI manager are much more
- : -> configurable to tweak best performance from your system. Also, the
- : -> Adaptec is being directly supported by OS/2 and WIN NT - with
- : -> Ultrastor you have to wait until they develop drivers for these
- : -> programs - they will, but they are slow to release them. The Adaptec
- : -> can be configured to run 30% faster than the Ultrastor on my system.
- : David I concluded the same after using both , I am interested in your
- : "tweaking" can you tell me a little more about your setup and
- : experiences , thanks.
- :
- Sure RH. I am running a clone DX2-50, with 16 meg ram. SCSI II hd, cdrom,
- dat tape drive, and flatbed scanner all hang off the 1542B. Luckily most
- of the settable parameters for the 1542 can either be set on the card, or
- thru the aspi4dos.sys driver. My config.sys line is:
-
- device=c:\dv\loadhi.sys c:\aspi\aspi4dos.sys /d /x01 /n08 /f02 /L
-
- the x parmeter sets DMA transfer speed - 01=6.7 MB/sec
- Using Coretest with a 32K block size ( coretest /b:32 ) to minimize scsi
- overhead, I adjusted the buson(/n) and busoff(/f) times to give highest
- numbers. As you can see, on this system best results are with a buson time
- of 8 and a busoff time of 2. The /l parameter enables LUNs.
-
- The only strange thing that happened was originally I had the hard drive
- at ID0 and terminated at the end of the internal cable. When I added the
- DAT (internal) unterminated at ID4 between the HA and the HD, I couldn't use
- DMA transfer speed higher than 5 MB/sec, and the dat did not stream. A
- tech person at WangDAT suggested putting the DAT terminated at the end of
- the internal cable, and unterminating the HD. For whatever reason, from
- then on I could use the faster DMA speed and the DAT now streams beautifully.
- --
- ------------------------------------------------------------------------------
- David A. Silva
- "The Sleeper has awakened" - Mua'dib
- ------------------------------------------------------------------------------
-