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    SubjectRe: idetape broke in 2.4.x-2.4.9-ac5 (write OK but not read) ide-scsi works in 2.4.4
    On Sat, 1 Sep 2001 11:03:12 EDT, wrote:

    >Now, I can get everything (my ide ls-120 and ide HP 8Gig tape) to work in
    >If I try not to use SCSI emulation for all 2.4.x kernels (including:
    >Kernel 2.4.9-ac5 on i686
    >ide-tape: ht0: I/O error, pc = 8, key = 5, asc = 2c, ascq = 0
    >tar: /dev/ht0: Cannot read: Input/output error
    >(writes work OK though)
    >As mentioned above, scsi emulation works for 2.4.4 (reads and writes). But if
    >turned on in 2.4.9-ac5, then I get
    >/dev/st0: No such device

    FWIW, my Seagate 4/8 GB ATAPI tape drive works just fine in all
    2.4.x kernels as /dev/{n,}ht0 -- no SCSI emulation for me.

    There are two known problem areas, which may or may not explain
    your problems:
    - block size: The 2.4 ide-tape driver only works reliably if you
    write data with the correct block size. If you don't write full
    blocks the last block of data may not be readable.
    The driver will log the block size to the kernel log when it's
    initializing, so you can take that value and pass it to your
    backup utility (26KB in my case so I pass -b52 to tar).
    - HP's not-quite ATAPI drives: Don't know about your model, but the
    HP 14(?)GB model is believed to deviate from ATAPI standards.

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