05-27-2013
Michael its OK fine that metadata is acquiring that space on tape but we noted this happens some times not all the times.
We faced problem again from last two days that our total data filesystem size is 1200GB & we are taking the backup of the same on LTO5 which has capacity of 1500GB. For the resolution of this we further moved our data from filesystem & bring the filesystem size down to 1000GB & took the backup which was successful. I am unable to understand what amount of metatdata was written on tape. Before LTO 5 we were taking 750 GB filessytem size backup on LTO4 which has native capacity of 800GB and we didn't face problem on that. But I don't know what happens with the LTO5.
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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)