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Operating Systems AIX Problem reading a 4mm tape drive Post 302118836 by Sprellarinn on Thursday 24th of May 2007 12:34:22 PM
Old 05-24-2007
You can easily find the block size with the following commands.

#Change the block size to variable
chdev -l rmt0 -a block_size=0

#Read one huge block
dd if=/dev/rmt0 of=/tmp/testblock bs=128k count=1

#Find the block size with wc
wc -c /tmp/testblock

And there you have the blocksize.
 

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tms(7)							 Miscellaneous Information Manual						    tms(7)

NAME
tms - TMSCP magnetic tape interface SYNOPSIS
For XMI/KDM on Alpha-based systems: bus xmi0 at iop0 vector xmierror controller uq0 at xmi? port kdm vector uqintr device tape tms0 at uq0 drive 0 For MSI Bus: only MIPS-based DECsystem 5500 bus msi0 at ibus? vector msi_isr controller dssc1 at msi0 msinode 1 device tape tms3 at dssc1 drive 3 For XMI/CI/HSC on Alpha-based systems: bus xmi0 at iop0 vector xmierror bus ci0 at xmi? port np vector cimna_isr controller hsc6 at ci0 cinode 6 device tape tms3 at hsc6 drive 3 For tms devices dual ported between two controllers: device tape tms2 at * drive 2 DESCRIPTION
The TMSCP driver provides a standard tape drive interface, as described in mtio(7). This is a driver for any controller that adheres to the Tape Mass Storage Control Protocol (TMSCP). The TMSCP controllers communicate with the host through a packet-oriented protocol termed the Tape Mass Storage Control Protocol. Tape Support - Alpha-based systems TA78, TA79, TA81, TA90, TA90E, TA91 Diagnostics All diagnostic messages are sent to the error logger subsystem. FILES
/dev/rmt??? /dev/nrmt??? SEE ALSO
mtio(7), MAKEDEV(8), uerf(8), tapex(8) delim off tms(7)
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