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- Newsgroups: vmsnet.internals
- Path: sparky!uunet!mcsun!sunic!sejnet.sunet.se!eric
- From: eric@sejnet.sunet.se (Eric Thomas)
- Subject: re: PATCH on ALPHA ?
- Message-ID: <1992Sep3.004623.1@sejnet.sunet.se>
- Lines: 34
- Sender: news@sunic.sunet.se
- Reply-To: ERIC@SEARN.SUNET.SE
- Organization: SUNET, Stockholm, Sweden
- References: <715362736.403197.MILLER@TGV.COM> <1992Sep1.214402.16889@eco.twg.com> <1992Sep2.022201.1@sejnet.sunet.se> <2SEP199209361066@rover.uchicago.edu>
- Date: Thu, 3 Sep 1992 00:46:23 GMT
-
- In article <2SEP199209361066@rover.uchicago.edu>, frank@rover.uchicago.edu (Frank - Hardware Hacker - Borger) writes:
- > Mercifully I'm not generally involved at this now, but I once was,
- > in the early days of RSX on 11s. I remember one series of patches.
- >
- > Patch I Reported to fix a problem that odd parity did not work
- > right on a single line DC interface.
- >
- > Patch II Fixed the problem that patch I fixed odd parity, but
- > broke even parity.
- >
- > Patch III Fixed the problem that patch II fixed even parity, but
- > broke no parity.
-
- Do you REALLY think this is any better without PATCH? A year or two after
- designing the code update distribution scheme I mentioned (100% patch-free),
- the vendor I mentioned had to invent a whole new type of distribution tape,
- available only for one particular release of one of their major products.
- Reason: there had been so many fixes to the fix that broke the fix that fixed
- the fix that correct the problem (...) that installing the product on one of
- the smaller CPU's (say something the speed of a MicroVAX 3600) took ONE WEEK OF
- CPU TIME, to check that everything was in order (all pre-requisites applied,
- all fixed to depending products also applied, etc). Each individual
- sub-component had thousands of fixes; the single most buggy component was the
- software update management system itself, which you had to fix before you could
- use it to fix other programs.
-
- So they got this great idea: they would get an employee to play the one-week
- game on a freshly installed machine, and then they would dump the disks to
- tape, and ship these tapes to customers who would just reload the data to the
- corresponding directories. That looks like directly patching the software
- update management system database if you ask me, but customers were DELIGHTED
- :-)
-
- Eric
-