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- Path: sparky!uunet!comp.vuw.ac.nz!actrix!ping!ping
- From: ping@ping.actrix.gen.nz (Peter Ingham)
- Subject: Parity (Was Re: Moving 500 to 1200, BAD NEWS)
- Newsgroups: comp.sys.amiga.hardware
- References: <1992Nov7.235338.5456@ntg.com>
- X-Newsreader: TIN [version 1.1 PL6]
- Message-ID: <ping.02pu@ping.actrix.gen.nz>
- Date: 9 Nov 92 22:29:24 GMT
- Organization: Private UUCP Site
- Lines: 56
-
- Dale Luck (dale@ntg.com) wrote:
- >
- > As opposed to just starting to do funny things, or silently corrupt
- > your data and harddisk. Oh? that bit that just flipped state turned a
- > read into a write. Oh well.
- >
-
- At last, a professional speaks!!!!
-
-
- > I'd would much rather be told that I had a memory failure as soon as
- > I accessed that piece of memory than to find out a little later
- > that something went wrong and maybe blame it on buggy software.
-
- Or a situation I experienced where a disk had a strange corruption on it.
- The fault was finally tracked down to a single bit error in main memory.
-
- This single bit (hard zero) got itself replicated throughout the disk after a
- disk optimiser had been used. The only problem was that comparatively few bits
- got changed, and by the time the site was SURE there was something wrong, the
- problem had got itslef into all 5 generations of the backup.
-
- Fixing the bad bit took very little time, and cost next to nothing.
-
- The errors in the users prime databases are probably still being fixed and could
- well have led to being the downfall of the company.
-
-
- > Parity memory is a necessity in any environment where security of
- > data is needed. Todays DRAMs are still succeptible to the occasional
- > alpha particle hit to knock those electrons around, especially in
- > the high density drams that do not have that much charge in those wells
- > to maintain the state of a memory cell.
- >
-
- People who run without any Parity should also run without backups if they're THAT
- confident of the reliability of their systems ....
-
- > EDC would be even better however the cost can be prohibitive.
-
- EDC??
-
- >
- > Dale Luck
- > GfxBase
- >
-
-
- Are there any plans for Parity on any future Amiga's ????
-
- --
-
- Cheers
-
- Peter S. Ingham ping@ping.actrix.gen.nz
- Lower Hutt, New Zealand 3:771/220.5
-