+++ /dev/null
-CHG-SCSI
-
-Jason's new and improved chg-scsi documentation. this documentation
-will also include an occasional reference to the mtx suite as I have
-attempted to use chg-zd-mtx. I use mtx often as a fast query tool.
-Please also refer to docs/TAPE.CHANGERS for additional details.
-
-My equipment list is as follows:
- Redhat 7.0 machine
- - dual processor p-III
- - sony dds3 tape drive
- - lots of hard disk space
- - Quantum/ATL L500 scsi changer
- 1 DLT tape drive (three possible)
- barcode reader
- fourteen tape slots
-
-I base this documentation on the following:
- mtx version 1.2.16rel
- amanda version 2.4.3b3
- SCSI2 specification: X3T9.2/375R revision 10L
- Quantum/ATL Field Service Manual 6321101-03 Ver.3, rel.0
- Quantum dlt800 Tape system product manual 02 April, 2001 81-60118-04
- the SCSI bus and IDE interface 2nd ed by Friedhelm Schmidt
- pub: Addision Wesley 1998
-
-Note that quantum/atl's L-series changers follow the scsi command set,
-and do not use any proprietary commands. thus, it was fairly simple to
-make this work.
-
-I had to install amanda --with-suffixes and setup my server's client
-side of things using amanda-2.4.2p2 --with-suffixes.
-
-Please note that my usage of "barcode" and "barcode reader" throughout
-this document really refers to "physical tape identification system".
-for example: the EEPROM in the AIT cartridge .
-
-------------------------
-command line options:
-
-chg-scsi's command line options:
- -slot <param>
- -info
- -reset
- -eject
- -clean
- -label <param>
- -search <param>
- -status <param>
- -trace <param>
- -inventory
- -dumpdb
- -scan
- -genconf
-
-
-Note that chg-scsi is called by amanda in the context of whatever amanda
-configuration amanda is currently using. In short, to call chg-scsi by
-hand, change to your amanda configuration directory, then run chg-scsi.
-
--slot <param> command:
-
- this command takes either a slot number, or any one of the
- following:
- current, next, prev, first, last, advance
-
- It then loads the appropriate tape into the drive.
-
- Note that if the tape is already loaded, no changer motion will
- happen. No reading of the tape is done here.
-
--info command:
-
- four numbers are printed:
- <slot# loaded> <number of slots> <reversable> <searchable>
-
- with chg-scsi, the reversable number is always 1. Searchable is
- set based on if a barcode reader is available and working
- correctly.
-
--reset command:
-
- Tape is unloaded, and slot 0 is loaded. No actual reset command
- is sent to the changer.
-
--eject command:
-
- Tape is unloaded, and put back into its original slot.
-
--clean command:
-
- Cleaning tape (if configured) is loaded into the tape. It is
- probably unloaded when done. I haven't looked closely at this
- yet.
-
--label <param> command:
-
- This appears to take the currently loaded tape's barcode and
- write it to the labelfile with the given parameter as it's tape
- header. I have not tested this.
-
--search <param> command:
-
- this only should be used if a barcode reader is present, or
- emulate barcode is turned on.
-
- the required parameter is an amanda tape label. the label
- searched in the labelfile. If a barcode is found, then that
- tape is loaded directly.
-
- I believe the fallback is to search the entire magazine.
-
--status command:
-
- the tape changer is queried, and the results are printed out.
- Values printed are what slots exist, are they full or empty, and
- what volume labels (barcodes) they are.
- Q. what about changers that don't retain current slot?
- A. this is what the "statfile" is for.
-
--trace command:
-
- present only for a particular type of changer.
-
--inventory: (this takes a LONG time to do)
-
- 1) unloads tape back to its slot
- 2) issues command to changer to do an inventory of itself (read all
- barcodes...)
- 3) loads each tape, retrieves the barcode, and reads the amanda
- label off of the tape itself
- 4) stores/updates the label database file
-
--dumpdb:
-
- prints out in human readable form the label database contents
- from the labelfile.
-
--scan: (aka scanbus)
- scans the scsi generic interfaces (eg: linux sg), and prints out the
- device name and the device types. I found that linux didn't
- classify either of my tape devices as generic, but this facility
- did. USE THIS FOR FINDING VALUE OF scsitapedev. Be certain
- though you have the correct tape drive: I came close to wreaking
- havoc with my dds3 drive while it was flushing amanda data...and
- my changer has a DLT drive! Please refer to my configuration
- notes below.
-
--genconf:
-
- prints out a SAMPLE changer.conf file. Note that I said sample.
- except for that it also does a scanbus. if you have more than
- one tape drive, please be certain it is correct as chg-scsi uses
- the first one it finds.
-
- Please refer to my configuration notes below.
-
---------------------------------------------
-
-changer.conf notes:
-
-Here, I try to be a bit more clear on what these config values mean.
-
-"number_configs" MUST be the first entry (not counting comments)
-
-"emubarcode" will set this value in chg-scsi regardless of the value you
-try to assign it. If you don't want "emubarcode" set, don't list it!
-
-"havebarcode"
- have barcode is tempered by what devices chg-scsi is aware of.
- if chg-scsi doesn't know about your changer explicitly, it will
- default to a default changer. the default changer has no
- barcode reader.
-
- In a patch I plan to post, I have added a generic changer that
- does use a barcode. set "changerident" to "genericbarcode" to
- use this.
-
-"sleep"
- number of seconds for chg-scsi to wait for a "tape drive ready"
- command after loading a new tape. Mine is 140 as I have a DLT
- tape drive, and my tape drive manual reports a max of 133
- seconds to be ready.
-
-"config"
- this is a header telling chg-scsi that all values following, up
- to the next "config" line apply to this drive number. It is
- this number that is refered to in your amanda.conf file as line
- "tapedev"
-
-"drivenum"
- this is the tape drive number in your changer. for a single
- tape drive, this is zero. Mine can handle up to three, so I
- expect I could make this 0, 1, or 2.
-
-"dev"
- the scsi device of your tape drive. under linux, in my case
- it is /dev/nst1. This MUST be defined.
-
-"scsitapedev"
- the generic scsi device of your tape drive. this is simply the
- generic interface to the device "dev" above. This entry is
- optional. In my case, it is /dev/sg2. If this entry exists and
- is legitimate, then scsi commands are formed directly instead of
- using ioctl commands.
-
-"startuse"
-"enduse"
- the start and end slots of your changer. Note that these also
- start with zero.
-
-"eject"
- chg-scsi tells the tape changer to eject. You might need to
- explicitly tell the tape drive to unload first. that's what
- this setting is for. Have you ever removed a loaded VCR tape
- by hand?
-
-"changerident"
- chg-scsi will first read the changer's identification from the
- return of the scsi "inquiry" command. If changerident is set in
- the configuration file, the scsi inquiry's value is overridden.
- chg-scsi will attempt to match the value with its built-in
- changertypes.
-
- "generic" is what the chg-scsi will default to
- "genericbarcode" is a hack of mine that forces the changer's
- barcode reader to work. Note that if your changer
- uses a superset of the scsi command set, this probably
- won't work.
- "L500" is another addition of mine that will enable a
- quantum/atl L500 to work correctly. It might even work
- with an L200.
-
- other values are (taken from the code)
- C1553A (HP Auto Loader)
- EXB-10e, EXB-120 (Exabyte Robot)
- EXB-85058HE-0000 (Exabyte Tape)
- TDS 1420 (Tandberg Robot)
- VLS DLT, VLS SDX (ADIC VLS DLT Library)
- FastStor DLT (ADIC FastStor DLT Library)
- Scalar DLT 448 (ADIC DLT 448)
- 215 (Spectra Logic TreeFrog)
- Quad 7 (Breece Hill)
- DLT7000, DLT4000 (DLT Tape)
-
-"debuglevel"
- setting this to "9:0" is very informative.
-
-"statfile"
- stores which "slot" that the tape in the drive came from
-
-"labelfile"
- binary file that stores the tape header and barcode information
-
-cleanmax
-cleancart
-cleanfile
- I have my changer set to autoclean, and the slot the cleaning
- cartridge is in is not available for any other use.
-
-
------------------------------------------------
-
-Amanda's actual usage of chg-scsi
-
-this should be brief:
- amanda really only issues "slot next" type commands. currently
- amanda doesn't ask chg-scsi to load "tape x with label
- Daily_set023". the chg-scsi mechanism is there for use, and
- functions quite well for the user to load a particular tape.
- I understand they (the amanda team) is working on this.
-
------------------------------------------------
-
-Configuration notes:
-
- (assuming one changer with one tape drive!)
-
-in "amanda.conf":
-
- set tpchanger to chg-scsi
- set changerfile to <pathname>/changer.conf
- set tapedev to 0
- set changerdev to /dev/<changer generic device>
- - this value is usually listed in the system boot
- messages or will be printed via syslog when the
- appropriate kernel module is loaded.
- eg: linux "modprobe sg"
-
-in changer.conf:
- set number_configs to 1
- set dev to <non-rewinding tape device eg: /dev/nst1>
- set debug to 9:0
-
-run "chg-scsi -scan" from your amanda configuration directory
- I get:
- name /dev/sg0 Tape
- Count 1
- name /dev/sg1 Changer
- Count 2
- name /dev/sg2 Tape
- Count 3
-
- I set scsitapedev to "/dev/sg0" to test with, then ran "chg-scsi
- -info". check the chg-scsi debug file for tapeidentification
- details. this is where I discoverd that "sg0" was not the
- correct tape!
-
- set scsitapedev to "/dev/<generic device>"
-
- if you have no barcode, try "changerident generic"
- if you have a barcode reader try "changerident genericbarcode"
-
-
-
------------------------------------------------
-
-Hacking notes:
-
-my hacks are:
- adding printout of "emubarcode" values in the debug file
-
- added dlt8000 tape drive to ChangerIO[], and SenseType[]
- added genericbarcode to ChangerIO[], and SenseType[]
- added L500 to ChangerIO[], and SenseType[]
-
-
- added a couple of basic sensecodes listed in the scsi specs for
- the generic and genericbarcode tape changers.
-
-
-
-My desires are:
- modify the sensecode code such that all scsi devices inherit the
- standard scsi codes and may override or append to them as
- needed.
-
- modify the configuration reading code and the "inquiry" command
- to allow spaces.
- eg: my changer displays the following ident data:
- "L500 6320000" but I had to create a type called "L500"
- or else the spaces would throw off the comparisons.
-
projects / debian / amanda / blobdiff