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- From: stroyan@hpfcso.FC.HP.COM (Mike Stroyan)
- Date: Wed, 26 Aug 1992 00:34:33 GMT
- Subject: Re: Recovering from disk with bad blocks
- Message-ID: <7371260@hpfcso.FC.HP.COM>
- Organization: Hewlett-Packard, Fort Collins, CO, USA
- Path: sparky!uunet!charon.amdahl.com!pacbell.com!mips!darwin.sura.net!wupost!sdd.hp.com!hpscdc!cupnews0.cup.hp.com!hppad.waterloo.hp.com!hppad!hpfcso!stroyan
- Newsgroups: comp.sys.hp
- References: <Bt6ryz.Iq2@knot.ccs.queensu.ca>
- Lines: 20
-
- > What are typical block numbers in the CANNOT READ BLCK ## messages you
- > receive?
- >
- > The two times I saw this message, I had accidentally attached two HP-IB disk
- > drives with the same bus number to the same bus. This is guaranteed to cause
- > havoc; irretrievable, unrecoverable, havoc. In those cases, the block
- > numbers I saw were huge, far beyond possible valid block numbers.
- >
- > I hope you didn't do what I did; if so, there's really no hope aside from
- > pulling the blocks off one at a time and attempting to reconstruct things
- > from individual untrashed blocks.
-
- I did once salvage a file system that had impossible block numbers. The
- damage was done by an HP-IB digitizer at the same address as an HP-IB
- disk drive. Only a few inodes had been corrupted. After resetting
- the bad block numbers with fsdb, fsck was able to put most of the file
- system back together. Since I never tried it a second time, I don't know
- just how much luck was involved. :-)
-
- Mike Stroyan, mike_stroyan@fc.hp.com
-