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- From: paulp@hpfcdc.fc.hp.com (Paul Perlmutter)
- Date: Thu, 17 Dec 1992 21:55:11 GMT
- Subject: Re: How does 'mediainit -G' (guru mode :-) work?
- Message-ID: <5570919@hpfcdc.fc.hp.com>
- Organization: HP Fort Collins, Co.
- Path: sparky!uunet!cs.utexas.edu!sdd.hp.com!hpscit.sc.hp.com!hplextra!hpfcso!hpfcdc!paulp
- Newsgroups: comp.sys.hp
- References: <sean.724574678@coombs>
- Lines: 28
-
-
- Please DO NOT use GURU mode. You must be trained on that option before
- use. Don't even ask ...
-
- 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. Most times
- you will be able to plug in a third-party disk and successfully use it.
- 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).
- HP goes to a lot of effort to qualify peripherals. Because you hook up a
- disk and can access it doesn't at all mean it works! 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. Or, how does the disk report diagnostic or error information?
- HP-UX may not be able to handle the data during error condition and not
- properly recover.
-
- A good starting point is to carefully read the disk's documentation. Also,
- the drive's manufacturer may have experience with your configuration. 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.
-
- Cheers,
- Paul Perlmutter
-
- PS. A very common and popular myth is that SCSI peripherals are "plug and play"
- compatible. Don't believe for a minute.
-