Greetings, list
A DDS2 tape has failed on a venerable old 1000A box of ours, and it's been
replaced with a 3rd party Python DDS3 (like the old, placed on the 1000A's
built-in narrow SCSI, external). After reviewing the entries in /dev and
what I built into the kernel, I changed nothing - and the drive seems to
work. Sort of (it seems painfully slow): 23 minutes to write 907MB to
tape.
Any feedback on what parameters seem to work optimally, what a "normal"
reply to "mt stat" looks like for an attached DDS3, what a proper config
entry prior to building the kernel should look like, etc? The tape is on
SCSI bus 0 and is target 5, lun 0. Do I understand correctly that this
tape is called "TLZ10" (not that I can see how this is directly relevant,
as far as config is concerned)? The box is (still) running Tru64 4.0D - an
upgrade to F is being planned.
The relevant lines from the kernel config:
[...]
bus pci2000 at pci0 slot 8
bus isp0 at pci2000 slot 0 vector ispintr
controller scsi0 at isp0 slot 0
device disk rz1 at scsi0 drive 8
device disk rz3 at scsi0 drive 24
device disk tz5 at scsi0 drive 40
controller tu0 at pci0 slot 11
[...]
Of interest is that tz5 has been called a disk all along, but this
doesn't seem to have mattered. Tape is target 5, bus 0 (lun 0).
The devices themselves:
crw-rw-rw- 1 root system 9,5127 Jun 29 1998 /dev/nrmt0a
crw-rw-rw- 1 root system 9,5121 Jun 29 1998 /dev/nrmt0l
crw-rw-rw- 1 root system 9,5125 Jun 29 1998 /dev/nrmt0m
crw-rw-rw- 1 root system 9,5126 Jun 29 1998 /dev/rmt0a
crw-rw-rw- 1 root system 9,5120 Jun 29 1998 /dev/rmt0l
crw-rw-rw- 1 root system 9,5124 Jun 29 1998 /dev/rmt0m
crw-rw-rw- 1 root system 9,5122 Apr 6 10:37 /dev/rmt0h
crw-rw-rw- 1 root system 9,5123 Sep 29 10:35 /dev/nrmt0h
BRU users -
I'm using the following brutab entry. Any comments or suggestions for
better buffer sizes, etc are highly welcomed. I believe the hardware does
compression automatically; with the DDS3, only single-volume usage is
anticipated (we have a 4.3GB and 18GB disk, nowhere near full, on the
box). The nrmt0h device is what we use:
#######################################################################
## REVISION - replaced DDS2 (4/8GB) with DDS3 (12/24GB) -CCS 09282000 ##
/dev/nrmt0h \
size=0 seek=0 bufsize=64k shmseg=7 shmmax=512K \
prerr=0 pwerr=0 zrerr=0 zwerr=0 frerr=0 fwerr=0 wperr=EIO \
reopen rawtape tape norewind noautoscan shmcopy
/dev/rmt0h \
size=12000MT seek=0 bufsize=64k shmseg=7 shmmax=512K \
prerr=0 pwerr=0 zrerr=0 zwerr=0 frerr=0 fwerr=0 wperr=EIO \
reopen rawtape tape rewind shmcopy
Thanks in advance for any feedback on any of this.
Cheers
Chris
======================================================================
Christopher C Stevenson C3004 office: (709) 737-2624
Dept. of Physics & Physical Oceanography fax: (709) 737-8739
Memorial University of Newfoundland
St. John's, Newfoundland, CANADA A1B 3X7
URL:
http://www.physics.mun.ca/~csteven
======================================================================
"A scientific truth does not triumph by convincing
its opponents and making them see the light, but
rather because its opponents eventually die and a
new generation grows up that is familiar with it."
-- Max Planck
"We are all in the gutter, but some of us are looking at the stars."
-- Oscar Wilde
Received on Fri Sep 29 2000 - 13:34:23 NZST