Re: [Networker] Troubleshooting a tape drive
2007-08-03 16:53:14
On Aug 3, 2007, at 12:18 PM, Davina Treiber wrote:
Stan,
In the absence of a vendor supplied kernel for this issue, you need
to enter into the true spirit of Linux, and build and install a
patched kernel.
You will need to install the kernel sources RPM. The file you need
to modify will be something like /usr/src/linux/drivers/scsi/st.c.
You will then need to configure and install the kernel for your
system. Probably slightly easier said than done, but at least there
is plenty info on the web about how to configure and build a custom
kernel.
Thanks Davina and Tim. I just tried to get the sources and I have
less than a clue about what I am doing, even with the web page that
Tim pointed me to. Since my manager ("Mr. Red Hat Linux will solve
the world's problems") insisted I use RH Linux instead of Solaris, I
will hand this part of the project to him when he returns from the
black hat conference and have him show me how to do this.
Oddly enough, I think I got it partially working. I can label tapes
without growing too much older. In addition, "nsrjb -C" comes back
with accurate information after about ten minutes, which is slower
then I prefer, but not as slow as I have seen on a heavily loaded
older server I used to have. I also kicked off "nsrjb -U50 -S1" to
set up a cleaning tape (yes, I have it in the first slot) and its
still sitting there after 15 minutes. I can also see that nsrjb will
mount/unmount tapes in all tape four drives, fine now, albeit slow.
I just finished doing a backup of the server, itself. After mounting
a tape, it gave an I/O error on the tape I manually labeled, but its
writing to a tape now that it labeled on its own after I switched on
the auto media management feature, although the throughput is only
around 5-10MB/s, which is certainly way too slow for direct attached
LTO-3 devices. I was also able to recover files from that backup
fine. Now, I am going to try backup up a largish Tru64 Unix server,
just to see what happens.
--
Stan Horwitz
stan AT temple DOT edu
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