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- From: sean@coombs.anu.edu.au (Sean Sebastian Batt)
- Newsgroups: comp.sys.hp
- Subject: Re: How does 'mediainit -G' (guru mode :-) work?
- Date: 20 Dec 92 10:36:29 GMT
- Organization: Australian National University
- Lines: 84
- Message-ID: <sean.724847789@coombs>
- References: <sean.724574678@coombs> <5570919@hpfcdc.fc.hp.com>
- NNTP-Posting-Host: 150.203.76.2
-
- In comp.sys.hp article <5570919@hpfcdc.fc.hp.com> Paul Perlmu;er wrote:
- >Please DO NOT use GURU mode.
-
- OK, then please tell me how I can reformat any SCSI disc for 1024
- bytes per sector. Pretend it's an HP disc, like a Micropolis 1528.
-
- >Using unsupported disks (or non-referenced disks) must be done with care,
- >and with a full understanding that you do so at your own risk.
-
- I know, I know. I said I understood that in my post.
-
- >Most times you will be able to plug in a third-party disk and
- >successfully use it.
-
- Thank heavens! We can't afford HP "qualified" peripherals, even at a
- hefty academic discount. If I suggested that pay HP's price for discs
- my boss would have a fit. He'd wonder why 3rd party discs weren't
- appropriate for HP gear when they work fine on Suns, DECStations,
- Macs, IBM PClones, etc., etc. Maybe then he'd wonder why I recommended
- HP gear when the after sale upkeep was so much greater that other
- competing products.
-
- (I'm employed on a 12 month contract and would like to keep my boss
- happy so it will be renewed. Wish me luck! :-)
-
- >Mediainit *may* work. You will have to make a new entry in
- >/etc/disktab (which has a set of instructions for doing so, at the
- >beginning of the file).
-
- Mediainit doesn't look at /etc/disktab, does it?
-
- >HP goes to a lot of effort to qualify peripherals.
-
- I'm sure they do. When I can afford to buy HP hardware exclusively,
- I'll probably do so. I'll need to win a lottery, though :-)
-
- >Because you hook up a disk and can access it doesn't at all mean it
- >works!
-
- Because it isn't an HP "qualified" disc and I can access it, doesn't
- mean that it's broken, either!
-
- >E.g. what happens if their are two disks on the system and they have
- >a funny interaction problem that occurs only once every several
- >thousand transfers? I've seen that several times.
-
- Then there's a bug. In the disc firmware? In the HP controler? In
- HPUX? If the disc works on Suns, IBMs, Macs, etc, won't HP be
- interested in the problem? Sure, I won't expect a fix; it's an
- unsupported disc! But at least I'd know that the disc worked.
-
- >A good starting point is to carefully read the disk's documentation.
-
- A starting point for WHAT? I just want to re-low-level-format a disc.
-
- >Also, the drive's manufacturer may have experience with your
- >configuration.
-
- Really, the drive's manufacturer has done enough.
-
- >If you can access it from your system, try running simple tests, such
- >as read / write tests. Also study the performance, since that may
- >give valuable information about how well the drive is working.
-
- This doesn't have a lot to do with what I'm attempting, but will
- probably be the subject of my next post.
-
- >Cheers,
- >Paul Perlmutter
-
- Thanks anyway, Paul.
-
- >PS. A very common and popular myth is that SCSI peripherals are "plug and play"
- >compatible. Don't believe for a minute.
-
- Good advice.
-
- Sean Batt
-
- --
- ------------- Sean Sebastian Batt - sean@coombs.anu.edu.au --------
- -------- Coombs Computing Section - Telephone: +61 6 249 3296 -----
- -- Australian National University - GPO Box 4 Canberra City 2601 --
- -------------------------------------------------------------------
-