Description:  This log file shows an example of using the "volumes="
and "vrecords=" options.  Basically, we will write 2 volumes, with 100
records being written on the last (2nd) volume.  This option is useful
when you don't know the capacity of the media, or when data compression
affects the total capacity, like it does with most tapes.  Please also
notice the new logic when requesting volumes... errors are now detected
and the user has the option of retrying, rather than exiting with a
failure on this lengthy test.  Enjoy, Robin.

meda# dt of=/dev/rmt0 bs=64k pf=../data/pattern_all enable=lbdata volumes=2 vrecords=100

Please insert volume #2 in drive /dev/rmt0, press ENTER when ready to proceed:
rewind tape: no medium

dt: Error number 1 occurred on Mon Jan 15 14:05:07 2001
The drive is NOT ready or encountered an error, Retry operation (Yes):
    [ Continuing in file #1, record #30277, bytes written so far 1984167936... ]

Write Statistics:
     Total records processed: 30376 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 1990721536 (1944064.000 Kbytes, 1898.500 Mbytes)
      Average transfer rates: 4473682 bytes/sec, 4368.830 Kbytes/sec
     Number I/O's per second: 68.263
     Total volumes completed: 2/2
      Total passes completed: 0/1
       Total errors detected: 0/1
          Total elapsed time: 07m24.98s
           Total system time: 00m00.56s
             Total user time: 00m34.23s

Please insert volume #1 in drive /dev/rmt0, press ENTER when ready to proceed:

Please insert volume #2 in drive /dev/rmt0, press ENTER when ready to proceed:
    [ Continuing in file #1, record #30277, bytes read so far 1984167936... ]

Read Statistics:
     Total records processed: 30376 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 1990721536 (1944064.000 Kbytes, 1898.500 Mbytes)
      Average transfer rates: 4748995 bytes/sec, 4637.690 Kbytes/sec
     Number I/O's per second: 72.464
     Total volumes completed: 2/2
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 06m59.18s
           Total system time: 00m00.68s
             Total user time: 02m40.50s

Total Statistics:
     Output device/file name: /dev/rmt0 (device type=tape)
     Type of I/O's performed: sequential
      Data pattern file used: ../data/pattern_all (15360 bytes)
   Data pattern read/written: 0x00000000 (first 4 bytes)
     Total records processed: 60752 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 3981443072 (3888128.000 Kbytes, 3797.000 Mbytes)
      Average transfer rates: 4250767 bytes/sec, 4151.140 Kbytes/sec
     Number I/O's per second: 64.862
     Total volumes completed: 2/2
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 15m36.64s
           Total system time: 00m01.25s
             Total user time: 03m14.73s
               Starting time: Mon Jan 15 13:59:30 2001
                 Ending time: Mon Jan 15 14:15:07 2001

meda# echo $?
0
meda#

==============================================================================

tru64% dt of=/dev/rfd0c bs=32k volumes=2 enable=lbdata vrecords=5 aios=4

Please insert volume #2 in drive /dev/rfd0c, press ENTER when ready to proceed: 
    [ Continuing at record #46, bytes written so far 1474560... ]

Write Statistics:
     Total records processed: 50 @ 32768 bytes/record (32.000 Kbytes)
     Total bytes transferred: 1638400 (1600.000 Kbytes, 1.562 Mbytes)
      Average transfer rates: 8004 bytes/sec, 7.816 Kbytes/sec
     Number I/O's per second: 0.244
     Total volumes completed: 2/2
      Total passes completed: 0/1
       Total errors detected: 0/1
          Total elapsed time: 03m24.70s
           Total system time: 00m00.00s
             Total user time: 00m00.01s

Please insert volume #1 in drive /dev/rfd0c, press ENTER when ready to proceed: 

Please insert volume #2 in drive /dev/rfd0c, press ENTER when ready to proceed: 
    [ Continuing at record #46, bytes read so far 1474560... ]

Read Statistics:
     Total records processed: 50 @ 32768 bytes/record (32.000 Kbytes)
     Total bytes transferred: 1638400 (1600.000 Kbytes, 1.562 Mbytes)
      Average transfer rates: 13859 bytes/sec, 13.534 Kbytes/sec
     Number I/O's per second: 0.423
     Total volumes completed: 2/2
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 01m58.21s
           Total system time: 00m00.01s
             Total user time: 00m00.16s

Total Statistics:
     Output device/file name: /dev/rfd0c (Device: floppy, type=disk)
     Type of I/O's performed: sequential
   Data pattern read/written: 0x39c39c39 (w/lbdata, lba 0, size 512 bytes)
     Total records processed: 100 @ 32768 bytes/record (32.000 Kbytes)
     Total bytes transferred: 3276800 (3200.000 Kbytes, 3.125 Mbytes)
      Average transfer rates: 9373 bytes/sec, 9.153 Kbytes/sec
     Asynchronous I/O's used: 4
     Number I/O's per second: 0.286
     Total volumes completed: 2/2
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 05m49.61s
           Total system time: 00m00.01s
             Total user time: 00m00.18s
               Starting time: Mon Jan 15 13:56:41 2001
                 Ending time: Mon Jan 15 14:02:30 2001

tru64%