On Mon, 17 Apr 2006, Wolfgang Denk wrote:
My best guess is that the problem is some sort of kernel SCSI lock race
condition. As a consequence, I would recommend that you concentrate on
writing lots of buffers as fast as you can, but from multiple processes,
possibly to the same or different drives. In fact, you might try firing off
several hundred write processes, and possibly a few read processes to another
drive.
I will try that, but you just blowed my theory of why we see the
problem only with bacula, but never (yet) with any other program
writing to tape.
Perhaps because Bacula writes to tape at _very_ high rates, so there's a
lot of scsi activity happening to disk and tape drives.
I didn't check earlier, but are the tape and hard drives on the same
scsi bus and/or controller and/or sharing interrupts?
AB
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