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    SubjectRe: Serious ext2fs problem
    On Tue, 31 Dec 1996, Chris Adams wrote:

    > Once upon a time, Stephen C. Tweedie wrote
    > > In article <199612311454.IAA18638@sh1.ro.com> Chris Adams
    > > <cadams@ro.com> writes:
    > > > In my case, the filesystem error in questions is
    > >
    > > > EXT2-fs error (device 08:31): ext2_new_block: Free blocks count
    > > > corrupted for block group 546
    > >
    > > > This is on a 10 gig RAID 0 news spool (on a DPT 3224). The system is
    > > > running Linux 2.0.27 + the noatime patch and INN 1.4unoff4. When I run
    > > > e2fsck (1.04 that comes with RedHat 4.0 and 1.06 from tsx-11), no errors
    > > > are reported.
    > >
    > > Bad SCSI bus.
    > >
    > > This is almost certainly bad hardware, either the disk or the SCSI
    > > bus. I'd check your cables and try pushing the bus speed down to 5
    > > MHz. I have seen almost identical symptoms on a news server myself,
    > > and it turned out to be hardware. The reason you see the free blocks
    > > count message is just that this is one place that the kernel is in a
    > > position to do some self-checking; single-bit errors on the SCSI bus
    > > in other blocks won't normally be detected.
    >
    > Once the errors start happening, they keep happening at the same place
    > over and over again. However, if I stop INN, umount the drive, mount
    > the drive, and start INN, everything is happy (I had it giving me the
    > above error twice everytime I tried to tell INN to "go"). Since I
    > umounted the drive and remounted it, it has been running just fine for
    > ~24 hours. That doesn't seem like hardware to me.

    Sure does to me. Bad memory, that is. Once a cached block gets
    corrupted it stays put and stays corrupted.

    Mark H. Wood, Lead System Programmer MWOOD@INDYVAX.IUPUI.EDU
    Those who will not learn from history are doomed to reimplement it.


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