Dave,
yes, tape_3590 driver is loaded and I can write to and read from tapes -
but not use the compression feature of the tape system.
By the way, about the driver scene: SLES10 delivers these tape drivers
as separate kernel modules. I don't dedicate tape devices to our linux
guests (in VM directory level), so I have added tape_s390 to
MODULES_LOADED_ON_BOOT in
/etc/sysconfig/kernel
so drivers are always loaded and ready when backup scripts "vmcp attach"
the tape device.
Tape devices could be dedicated to all linux guests in MULTIUSER mode,
and then tape drivers get loaded automatically on linux ipl... sorry:
boot. When one linux needs to tape, it just puts the device online with
chccwdev -e.
Afaik, CMS can't put tape device online like this, so it needs the
device in SINGLEUSER mode - which means that MULTIUSER attachments must
be detached in the VM region.
We still use tapes in CMS REXX scripts, therefore I use the first approach.
Better ideas for this scenario are also welcomed.
Thanks,
Juha
Dave Jones wrote:
Hi, Juha.
My first suggestion would be to see if you have the proper IBM tape
(3590) device driver modules either built directly into the kernel or
loaded at runtime. An lsmod command should tell you this.
Good luck.
Juha Vuori wrote:
We run SLES10 SP1s under VM, and make data backups to 3592 tape machine
directly from linuxes.
I understand that there should be a compression feature inside this tape
system.
According to Device Drivers, Features, and Commands - SC33-8289-04, it
could be activated in tape_3590 driver with
# mt -f /dev/rtibm0 compression 1
but "mt" in this distribution does not support "compression" command.
Compressing with
tar -czf ...
works fine, but gzip eats lots of cpu.
So I would be happy to get advice on this, or references to good books...
TIA,
Juha Vuori
sysprog
Lindorff, Finland
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