01-31-2011
Well, the first thing that strikes me is that you have set a block size in your backup (-b 20) that you have not set on your listing request. It may suggest that it is the deafult, but you never know it might just be that.
The other thing I would worry about is if you are writing to the no-rewind device. If not, then you may auto-rewind at the end of the write and the next will overwrite each time, to you will only have the last backup. It depends on your OS as to which is the non-rewind device. AIX would normally be /dev/rmt0.1, but that doesn't match your format so you would have to look at man rmt - or perhaps man nst in your case to see if it helps.
It may also be that the ssh is getting in the way and you may not be writing a valid archive in the first place. When I have done this sort of thing, I have shared the device as a whole and driven it directly from server B without the piped control.
Robin
Liverpool/Blackburn
UK
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tms(4) Kernel Interfaces Manual tms(4)
Name
tms - TMSCP magnetic tape interface
Syntax
For UNIBUS, Q-bus:
controller klesiu0 at uba0
controller uq0 at klesiu0 csr 0174500 vector uqintr
tape tms0 at uq0 drive 0
For MSI Bus:
adapter msi0 at nexus?
controller dssc0 at msi0 msinode 0
tape tms0 at dssc0 drive 3
For VAXBI:
controller klesib0 at vaxbi0 node 0
controller uq0 at klesib0 vector uqintr
tape tms0 at uq0 drive 0
controller aie0 at vaxbi? node?
controller bvpssp0 at aie0 vector bvpsspintr
tape tms0 at bvpssp0 drive 0
For MSI Bus:
adapter msi0 at nexus?
controller dssc0 at msi0 msinode 0
tape tms0 at dssc0 drive 0
For VAX CI/HSC:
adapter ci0 at nexus?
adapter ci0 at vaxbi? node?
controller hsc0 at ci0 cinode 6
tape tms0 at hsc0 drive 3
Description
Prior to Version 2.0, this device was referenced by tmscp(4).
The TMSCP driver provides a standard tape drive interface, as described in 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. This driver also supports n-buffered reads and writes to the raw tape interface (used with streaming tape
drives). See for further details.
Tape Support
TK50, TK70, TF70, TU81, TU81e, TA78, TA79, TA81, RV20, TA90, TA90E, TA91
Diagnostics
All diagnostic messages are sent to the error logger subsystem.
Files
See Also
mtio(4), nbuf(4), MAKEDEV(8), uerf(8), tapex(8)
Guide to the Error Logger
tms(4)