Rob,
I'm afraid that I cannot help you directly on this, but on my "tips" library
I have filed the following IBM TechDoc:
*Using Virtual Tape on the IBM System i5*
https://www-304.ibm.com/support/docview.wss?uid=nas1a370fba852b0d20f862571240067973e
Tiny URL:
http://tinyurl.com/3k25rqx
Which states:
*Density
The density (format) parameter limits the block size that can be written to
a virtual tape volume so that the volume will be compatible for duplication
to your physical tape device.
o
Volumes with a density of *VRT256K use an optimum block size of 256KB and
are compatible with 35xx type devices and the newer QIC tape devices.
o
Volumes with a density of *VRT240K use an optimum block size of 240KB and
are compatible with VXA and 8mm technology devices and the 35xx and newer
QIC devices.
o
Volumes with a density of *VRT64K use an optimum block size of 64KB and are
compatible with 3490F Model 18 track media, VXA and 8mm technology devices,
and with the 35xx and newer QIC devices.
o
Volumes with a density of *VRT32K do not use an optimum block size and are
compatible with all devices.
The virtual tape media cannot be copied to physical media if you choose an
incompatible block size. Ensure a virtual tape density with a block size
that is compatible with the physical tape devices on your system is selected
by performing one of the following:
o
In iSeries Navigator, expand Configuration and Service > Hardware > Tape
Devices > Tape Libraries > Tape Resources for tape library devices. Next,
right click on the device that you want to view and select Properties to
display the supported block sizes for your tape device.
o
In iSeries Navigator, expand Configuration and Service > Hardware > Tape
Devices > Stand-Alone Devices for stand alone tape devices. Next, right
click on the device that you want to view and select Properties to display
the supported block sizes for your tape device.
o
Save a small library to your physical tape drive with the USEOPTBLK
parameter set to *YES. Type DSPTAP DATA(*LABELS) in the command line, and
use the Block Length field to see the block size that was used.
HTH,
o In iSeries Navigator, expand Configuration and Service > Hardware > Tape
Devices > Tape Libraries > Tape Resources for tape library devices. Next,
right click on the device that you want to view and select Properties to
display the supported block sizes for your tape device. o In iSeries
Navigator, expand Configuration and Service > Hardware > Tape Devices
Stand-Alone
Devices for stand alone tape devices. Next, right click on the device that
you want to view and select Properties to display the supported block sizes
for your tape device. o Save a small library to your physical tape drive
with the USEOPTBLK parameter set to *YES. Type DSPTAP DATA(*LABELS) in the
command line, and use the Block Length field to see the block size that was
used.
*
Luis Rodriguez
IBM Certified Systems Expert — eServer i5 iSeries
--
On Tue, Sep 6, 2011 at 10:36 AM, <rob@xxxxxxxxx> wrote:
What do I set the block size to on virtual tape to dup to LTO3?
3573 or 3576 will be the physical drives.
Rob Berendt
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