On Sun, Sep 24, 2006 at 08:38:39PM +0200, Dominik Schips wrote:
> Hello,
> 
> I have changed my hardware setup.
> Now I have a Overland PowerLoader with 2 HP Ultrium LTO2 drives.
> They are /dev/nst0 (/dev/sg1) and /dev/nst1 (/dev/sg2).
> The PowerLoader has a tape changer (/dev/sg3).
> 
> The problem is that if I do a amcheck Mybackup I get this error message:
> 
> Amanda Tape Server Host Check
> -----------------------------
> Holding disk /mnt/Holding_Disk: 877071032 KB disk space available, 
> that's plenty
> amcheck-server: could not get changer info: cannot determine first slot
> 
> Amanda Backup Client Hosts Check
> --------------------------------
> Client check: 1 host checked in 0.092 seconds, 0 problems found
> 
> How to configure amanda to use the 2 LTO drives for backup?
> Which device to use in the amanda.conf or in the CHANGER file?
> With one LTO drive everything was working fine with the mtx device driver.
> 
> I need a hint to get the "could not get changer info: cannot determine first 
> slot" error message solved.
> 
> 
> Here my amanda.conf:
> 
> # a filesystem is due for a full backup once every <dumpcycle> days
> dumpcycle 0             # the number of days in the normal dump cycle
> #runspercycle 10        # Standard: runspercycle = dumpcycle
> tapecycle 100 tapes     # the number of tapes in rotation until it is reused
> bumpsize 20 MB          # minimum savings (threshold) to bump level 1 -> 2
> bumpdays     1          # minimum days at each level
> bumpmult     4          # threshold = bumpsize * (level-1)**bumpmult
> ctimeout 60             # amcheck timeout in secs per host
> etimeout 300            # amdump planner timeout in secs per filesystem
> runtapes 16             # Tapechange if one tape is not enough
> inparallel 6           # maximum dumpers that will run in parallel
> maxdumps 3              # Default: 1. The maximum number of backups from a 
> single host that AMANDA will attempt to run in parallel.
> taperalgo   largestfit  # Default: first. The algorithm used to choose which 
> dump image that is available on the holdingdisk to send to the taper.
> dumporder   "TtttttttttttttT" # 15 dumps - as many T's as there are dumpers
> 
> # Config for OVERLAND PowerLoader Tape Autoloader
> tpchanger "chg-zd-mtx" # the tape-changer glue script, see TAPE.CHANGERS
> changerdev "/dev/sg2" # tape-changer device
> changerfile "/etc/amanda/DailyFull/CHANGER"
> 
> 
> 
> And here my CHANGER file:
> 
> # Drive) slot number. Default to 0
> driveslot=0
> 
> # First storeage slot (element) -- required
> firstslot=1
> 
> # Last storeage slot (element) -- required
> lastslot=16
> 
> # If a barcode reader is present
> havereader=1
> 
> # Activate autocleaning
> autoclean=0

Two things.

You say your changer is /dev/sg3 but your conf file says sg2.

Also, nowhere in the conf files is a tape device defined.


As to using multiple drives, amanda is not designed to do that.
Ways amanda users do use multiple drives include:

  chg-multi which treats two (or more) drives as if they were
  a tape changer with a single drive

  set up multiple configs, each backing up a different set of
  hosts.  assign a separate group of slots and 1 drive to each
  config

  use the drives as a RAIT, either mirroring the data or
  striping the data across the two drives

-- 
Jon H. LaBadie                  jon AT jgcomp DOT com
 JG Computing
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 Princeton, NJ  08540-4322      (609) 683-7220 (fax)