Tapetype definitions

Running amtapetype takes some time (expect 5-8 hours). The program will fill a scratch tape twice with random data. When running "amtapetype" yourself be sure to add a realistic estimate option: "amtapetype -e 200g ...", otherwise, the program could take days to complete.

Running amtapetype on your installation instead of just using the values found here, allows you to verify the capacity (is hardware compression "on" by mistake?) and speed (is there a problem with my SCSI chain?).

Not all tapes have exactly the same length, therefor some length values have been rounded down, as noted in the entries. This allows Amanda to do better planning, because you waste a lot of capacity when the last few bytes of a multi-gigabyte dump do not fit on the tape.

Quantum DLT8000

• Attached to Adaptec 2940 Fast-SCSI (10MB/s)

define tapetype DLT8000 {
    comment "Quantum DLT8000 created by tapetype"
    length 38130 mbytes
    filemark 29 kbytes
    speed 5627 kps
}

Quantum SDLT600

• Attached to Adaptec 2940 Fast-SCSI (10MB/s)

define tapetype SDLT600 {
    comment "Quantum SDLT600 with 10MB/s"
    length 306789 mbytes
    filemark 0 kbytes
    speed 8247 kps
}

• Attached to Adaptec 19160 SCSI-160 LVD (160MB/s)

define tapetype SDLT600 {
    comment "Quantum SDLT600 with SCSI-3"
    length 304896 mbytes
    filemark 0 kbytes
    speed 31703 kps
}

Quantum DLT-V4

• Attached to Adaptec 29160 Ultra160 SCSI adapter, using DLT-VS1 tape: created using 'tapetype' by [email protected]

 define tapetype Quantum-DLT-V4 {
     comment "Quantum-DLT-V4 on Adaptec 29160"
     length 157284 mbytes
     filemark 0 kbytes
     speed 9936 kps
 }

Sony AIT-1 with 35/70 Gbyte tapes

• Attached to Adaptec 2940 (10 MB/s)

 define tapetype AIT1-35 {
     comment "AIT1 cartridge 35/70 Gbyte compression off"
     length 33400 mbytes    # rounded down
     filemark 500 kbytes
     speed 2890 kps
 }

LTO Ultrium 1 with 100/200 Gbyte tapes

• Attached to Adaptec 39160

Note: using hardware compression together with software compression does not lower the tape capacity, as many other tape drives do.

 define tapetype LTO {
   comment "just produced by tapetype prog (hardware compression off)"
   length 101376 mbytes
   filemark 0 kbytes
   speed 13872 kps
 }

HP448 (LTO Ultrium2) with 200/400 Gbyte tapes

• Attached to Adaptec 29160 (160 MB/s)

Note: using hardware compression together with software compression does not lower the tape capacity, as many other tape drives do.

 define tapetype LTO2-200 {
     comment "LTO Ultrium2 200/400"
     length 193024 mbytes
     filemark 0 kbytes
     speed 20570 kps
 }

DDS-2 90 meter tapes

• Attached to Adaptec 2940

 define tapetype DDS90 {
     comment "DDS tapes drives - 90 meter tapes"
     length 1900000 kbytes # rounded down
     filemark 111 kbytes
     speed 380 kps
 }

DDS-2 120 meter tapes

• Attached to Adaptec 2940

 define tapetype DDS120 {
     comment "DDS tape drives - 120 meter tapes"
     length 3850000  # rounded down
     filemark 111 kbytes
     speed 380 kps
}

HP DLT1 drive, DLT IV tape

• external HP DLT1 drive, attached to Adaptec AIC7890, hw-compression enabled (factory default), using a HP C5141F tape

 define tapetype DLT1 {
   comment "HP DLT1, DLT IV Tape C5141F "
   length 34818 mbytes
   filemark 32 kbytes
   speed 2879 kps
}

DDS-5 170 meter tapes

• Attached to PCI-X Dual Channel Ulta320 SCSI Adapter
• AIX 5.2 IBM DAT-72 external tape drive compression enabled
• amtapetype -e 36G -f /dev/rmt0.1
• Writing 512 Mbyte compresseable data: 37 sec
• Writing 512 Mbyte uncompresseable data: 200 sec
• wrote 967272 32Kb blocks in 82 files in 12017 seconds (short write)
• wrote 967272 32Kb blocks in 164 files in 12169 seconds (short write)

define tapetype IBM-DAT-72 {
   comment "DDS5, /dev/rmt0.1 (hardware compression on)"
   length 30227 mbytes
   filemark 0 kbytes
   speed 2559 kps
}

• AIX 5.2 IBM DAT-72 external tape drive compression disabled
• chdev -l rmt0 -a compress=no
• amtapetype -o -f /dev/rmt0.1
• Writing 256 Mbyte compresseable data: 96 sec
• Writing 256 Mbyte uncompresseable data: 86 sec
• wrote 1133055 32Kb blocks in 3465 files in 17837 seconds (short write)
• wrote 1072214 32Kb blocks in 6578 files in 23159 seconds (short write)
• This took about 12 hours to complete

define tapetype IBM-DAT-72 {
   comment "DDS5, /dev/rmt0.1 (hardware compression off)"
   length 37522 mbytes
   filemark 625 kbytes
   speed 1757 kps
}

• Solaris 10, with HP C7438A DAT-72 external tape drive compression enabled
• Attached to X4422A Dual GigE Ultra-2 SCSI Adapter
• amtapetype -e 36G -f /dev/rmt/0n
• Writing 512 Mbyte compresseable data: 37 sec
• Writing 512 Mbyte uncompresseable data: 200 sec
• wrote 967272 32Kb blocks in 82 files in 12084 seconds (short write)
• wrote 967272 32Kb blocks in 164 files in 12176 seconds (short write)

define tapetype HP-DAT-72 {
   comment "DDS5, /dev/rmt/0ln, HP C7438A Rev V309 (hardware compression on)"
   length 30227 mbytes
   filemark 0 kbytes
   speed 2551 kps
}

• Solaris 10, with HP C7438A DAT-72 external tape drive compression disabled
• amtapetype -o -f /dev/rmt/0ln
• Writing 512 Mbyte compresseable data: 170 sec
• Writing 512 Mbyte uncompresseable data: 169 sec
• wrote 1133709 32Kb blocks in 3467 files in 17819 seconds (short write)
• wrote 1073029 32Kb blocks in 6583 files in 23171 seconds (short write)

define tapetype HP-DAT-72 {
   comment "DDS5, /dev/rmt/0ln, HP C7438A Rev V309 (hardware compression off)"
   length 37537 mbytes
   filemark 623 kbytes
   speed 1758 kps
}