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    SubjectRe: Problems with SCSI tape rewind / verify on 2.4.29

    n Wed, Mar 02, 2005 at 12:08:51PM -0500, Gene Heskett wrote:
    > On Wednesday 02 March 2005 07:03, Marcelo Tosatti wrote:
    > >On Wed, Mar 02, 2005 at 11:15:42AM -0000, Mark Yeatman wrote:
    > >> Hi
    > >>
    > >> Never had to log a bug before, hope this is correctly done.
    > >>
    > >> Thanks
    > >>
    > >> Mark
    > >>
    > >> Detail....
    > >>
    > >> [1.] One line summary of the problem:
    > >> SCSI tape drive is refusing to rewind after backup to allow verify
    > >> and causing illegal seek error
    > >>
    > >> [2.] Full description of the problem/report:
    > >> On backup the tape drive is reporting the following error and
    > >> failing it's backups.
    > >>
    > >> tar: /dev/st0: Warning: Cannot seek: Illegal seek
    > >>
    > >> I have traced this back to failing at an upgrade of the kernel to
    > >> 2.4.29 on Feb 8th. The backups have not worked since. Replacement
    > >> Drives have been tried and cables to no avail. I noticed in the
    > >> the changelog that a patch by Solar Designer to the Scsi tape
    > >> return code had been made.
    > >
    > >v2.6 also contains the same problem BTW.
    > >
    > >Try this:
    > >
    > >--- a/drivers/scsi/st.c.orig 2005-03-02 09:02:13.637158144 -0300
    > >+++ b/drivers/scsi/st.c 2005-03-02 09:02:20.208159200 -0300
    > >@@ -3778,7 +3778,6 @@
    > > read: st_read,
    > > write: st_write,
    > > ioctl: st_ioctl,
    > >- llseek: no_llseek,
    > > open: st_open,
    > > flush: st_flush,
    > > release: st_release,
    > >-
    >
    > Interesting Marcelo. How long has this been true in 2.6?

    Actually I just checked and it seems v2.6 is not using "no_llseek".

    However John L. Males reports the same problem with v2.6 - John, care
    to retest with v2.6.10 ?

    > I thought I had an amanda problem, and eventually went to virtual
    > tapes on disk, largely because of this. However, I have to say it is
    > working better than tapes ever did here. Unforch, that 200GB disk is
    > certainly a single point of failure I don't relish thinking about...

    :)
    -
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