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
dpf AT comp.rgu.ac DOT uk
Tel: +44 (0)1224 262774
The Robert Gordon University
School of Computing
St. Andrews Street
Aberdeen
-----------------------------------------
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