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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!cs.utexas.edu!geraldo.cc.utexas.edu!portal.austin.ibm.com!awdprime.austin.ibm.com!hartmann.austin.ibm.com!lance
- From: lance@hartmann.austin.ibm.com (Lance Hartmann)
- Subject: Re: Cache-controllers any good? -> was:Are Cache-controllers rubbish?
- Summary: Cached disk controller comments
- Sender: news@austin.ibm.com (News id)
- Message-ID: <BzH2xp.108I@austin.ibm.com>
- Date: Fri, 18 Dec 1992 20:44:13 GMT
- Reply-To: lance%hartmann.austin.ibm.com@ibmpa.awdpa.ibm.com
- References: <1992Dec15.155638.330@csghsg5a.bitnet> <1992Dec15.165108.1521@cs.unca.edu> <1992Dec16.112753.334@csghsg5a.bitnet>
- Organization: IBM, Austin
- Keywords: disk cache controller scsi ide
- Lines: 51
-
- In article <1992Dec16.112753.334@csghsg5a.bitnet> lmebold@csghsg5a.bitnet writes:
- >In article <1992Dec15.165108.1521@cs.unca.edu>, boyd@cs.unca.edu (Mark Boyd) writes:
- >> Is "rubbish" the new buzz word used by folks who don't have the
- >> foggiest idea what they are talking about? What with "is AMD rubbish"
- >> [STUFF DELETED]
- >>
- >> sense, in your choice of words. AMD is one of the most successful chip
- >> makers around and cache controllers are definitely here to stay.
- >> Rubbish is simply not an appropriate word to describe either of these
- >[ ... ]
- >
- >I heard that cache-controllers may have problems with
- >new operating systems (e.g. OS/2: it can even be slower
- >with a cache on the controller). I'm on the way to buy
- >an EISA-SCSI-II-hostadaptor and want to run it with WindowsNT
- >[REMAINDER DELETED]
-
- I'm using as my primary disk controller the Promise Technology DC-2040.
- The controller appears as a regular IDE controller (Winchester compatible),
- but is actually a cached-SCSI controller. In fact, you can even run
- in 32-bit fastdisk-mode under Windows 3.1. I currently have 1MB on mine
- though it is expandable to 16MB.
-
- In short, I like it. I don't use any kind of software cacheing (thereby
- preserving my system RAM) and my performance is EXCELLENT. Because my
- primary use is currently database (FoxPro 2.0) under DOS, I chose a
- cached controller.
-
- If I originally set forth to run under a REAL operating system
- (ie. OS/2, UNIX, etc.), I'd have to do some more research. Ideally,
- the thought of having the management of cacheing handled completely
- by another processor under OS/2 or UNIX is quite appealing to me
- as long as you were able to "tune" the operating system to work
- nicely with it. REAL operating systems have enough to deal with --
- why not offload some work to another processor? I would hazard the
- opinion that there must be some flavor of UNIX or file system available
- for UNIX which would have some kind of tunable for specifying cache
- sizes, enable/disable, etc.
-
- As for OS/2, "Promise Technology" stated (a few weeks ago) that they had
- a BETA version of an OS/2 2.0 driver for their cached-controller. I need
- to give them a ring and see how that's coming...
-
- Disclaimer: I have no affiliation with Promise Technology other than
- being a happy owner of their disk controller...your milage may vary...
-
- Lance Hartmann (lance%hartmann.austin.ibm.com@ibmpa.awdpa.ibm.com)
- Yes, that IS a '%' (percent sign) in my network address.
- ------------------------------------------------------------------------------
- All statements, comments, opinions, etc. herein reflect those of the author
- and shall NOT be miscontrued as those of IBM or anyone else for that matter.
-