On 5 Feb 2003 at 14:20, Jon LaBadie wrote: > On Wed, Feb 05, 2003 at 06:06:33PM -0000, David Flood wrote: > > We have had a tape changer running with amanda for a while but it was just being >used > > as the a single drive and the data is starting to exceed the size of the >tape.(DLT40 - > > 80G compressed) > > > > I'm starting to look into utilizing the functionality of the changer. I've looked >at the docs > > and have the impression that all I have to do is specify the chg-scsi in the >amanda.conf > > and set-up the chg-scsi.conf. Here are examples of the part of amanda.conf and > > chg-scsi.conf. > > > > amanda.conf: > > tpchanger "chg-scsi" # the tape-changer glue script > > tapedev "0" # the no-rewind tape device to be used > > changerfile "/opt/amanda/etc/amanda/homes/chg-scsi.conf" > > > > chg-scsi.conf: > > number_configs 1 > > eject 0 > > sleep 60 > > cleanmax 10 > > changerdev /dev/rsst4 > > # > > # Next comes the data for drive 0 > > # > > config 0 > > drivenum 0 > > dev /dev/rmt/0bn > > startuse 0 > > enduse 4 > > statfile /opt/amanda/etc/amanda/homes/tape0-slot > > cleancart 5 > > cleanfile /opt/amanda/etc/amanda/homes/tape0-clean > > agecount /opt/amanda/etc/amanda/homes/totaltimef > > tapestatus /opt/amanda/etc/amanda/homes/tape0-status > > > > > > I think I understand the contents of this file but I don't know what to put for >the > > changerdev file. Up till now I've been using /dev/rmt/0 for backing up to a single >tape so > > how do I find what this value should be for my changer.(/dev/rsst4 does not exist) > > > > Also when I've got the changer working how do the tape numbers work? If a night's > > backup tape starts on homes02 and spreads 2 tapes will amanda understand it's > > spread over homes02 and homes03? If so how does this affect restores? > > David, > gotta learn to mention amanda version and OS type. They may affect the replies. > > Seems to be Solaris you are using (a /opt and /dev/rmt). > > My changer, when installed according to HP's very good and specific directions, > resulted in two separate /dev/rmt devices, 0 for the tape drive, 1 for the changer > mechanism. When earlier, I installed it following "Jon's" instructions and not > RTFM'ing, I got one device. > > That doesn't mean you will always get 2 /dev/rmt devices, just that is one way > of working and urging you to get to the docs for your brand and model and OS. > In my case it even involved getting to the drive itself (removing the case) > and setting some switches not accessible from outside. It also required mods > to the "st" (scsi tape) driver configuration file, /kernel/drv/st.conf. > > If your solaris is a recent update of Solaris 8, Sun has tried to generalize > tape changer drivers. It uses something called the "sgen" driver. When > configured, changers will be sensed and devices created in /dev/???/changer/XXX. > I've not done the configuration because "don't fix what ain't broken". But I > think you can find stuff about setting it up on "docs.sun.com", man sgen, and > even this mail list archives on yahoo. > > Myself, I use mtx to manipulate the changer just like mt manipulates the drive. > And I use chg-mtx, not even chg-zd-mtx. It is simpler and it works for me. > > > As to your final questions, you will also have to set the amanda.conf parameter > "runtapes" to be more than 1. Amanda will use extra tapes only if necessary, > It will continue to use them in the same sequence it currently does, not skipping > any tapes because it reports "next tapes are 5 and 6" but it only uses 5. However > you may want to increase the number of tapes in rotation so you can still get > the same number of dumpcycles in the number of tapes. Note, you can have more > tapes in rotation than tapecycle specifies. That is a minimum. > > Recovery? No change. Amanda knows what it put on each tape. It asks you for > what tapes are needed. >
Firstly thankyou Jon and Gene for answering my first email. Sorry I forgot to specify my setup. It's as follows: amanda 2.4.3 Solaris 8 Overland DLT80 (10 tape changer) Under /dev/rmt I only have '0' which is the one I'm using to get access to the drive. What is mtx and is it possible I could use this? There was no examples of this file under the examples directory of the amanda distribution. I am looking at sgen and thus far don't really understand it but will keep trying. The method I used for setting up my autochanger was the one I thought was used for any new device attached to a sun: shutdown add device take system up to ok promt boot -r ----------------------------------------- David Flood Systems Administrator [EMAIL PROTECTED] Tel: +44 (0)1224 262774 The Robert Gordon University School of Computing St. Andrews Street Aberdeen -----------------------------------------
