Thanks for the info Matt, I will watch out for this.
Looking forward to meeting you on the 24th...
Wanda Prather
> -----Original Message-----
> From: Long, Matt [SMTP:Matt.Long AT MARRIOTT DOT COM]
> Sent: Tuesday, February 15, 2000 9:24 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Serious 9840 drive problem !!!!
>
> Wanda,
>
> I have had a very serious 9840 tape drive issue hinder our backup
> environment and caused one of our STK9710's with 9840's to lock up for
> over
> a month. Apparently, if you are using anything above version 1.2.2 of the
> 9840 microcode, then it becomes incompatible with the ADSM software and
> causes the ADSM software to go into error recovery. STK did not tell IBM
> that it treats an ioctl rewind with a drive sense of 3A now instead of an
> 04. We spent 4 weeks beating our heads into the ground over this issue.
> It
> almost caused serious issues with our production systems as well. Please
> be
> aware of this problem as it is very serious and will cause ADSM to do some
> bizarre things with a very slow response time. Supposedly, STK will be
> providing a fix to the problem at the end of the month with another
> version
> of drive code (1.2.5.112). You can also call IBM as they also have a work
> around to this problem. Thanks
>
> Matt Long
> Systems Administration
> Marriott International
>
>
> -----Original Message-----
> From: Angelo DeAngelis [mailto:Angelo_DeAngelis AT TIVOLI DOT COM]
> Sent: Monday, February 14, 2000 3:26 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: ADSM 9840 & Compression
>
>
> This my friends is the best explanation of the situation.
>
>
>
>
> "Prather, Wanda" <Wanda.Prather AT JHUAPL DOT EDU> on 02/14/2000 12:48:30 PM
>
> Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
>
> To: ADSM-L AT VM.MARIST DOT EDU
> cc: (bcc: Angelo DeAngelis/Tivoli Systems)
> Subject: Re: ADSM 9840 & Compression
>
>
>
> We are running 9840's, converting all our old data from DLT7000.
>
> I'm getting exactly the same results on the 9840's that I saw on the
> DLT7000's.
>
> If I take a DLT7000 tape that filled at native capacity (35 GB), then I
> know
> it was already-compressed data. A MOVE DATA to a 9840 ends up filling the
> 9840 at 20 GB.
>
> If I take a DLT7000 that filled at 70-100GB, I know the data was not
> compressed to start with, and a MOVE DATA to a 9840 ends up filling the
> 9840
> at 70-80GB.
>
> So it's working about as expected. If the data is compressed by the
> software, it isn't going to compress much more in the hardware - you'll
> get
> an additional 10% if you're lucky.
>
> Remember that even if you don't have COMPRESSION ON in the ADSM client,
> some
> types of data are already naturally compressed - Windows machines with
> stacking or compression on in the disk file system; Microsoft Exchange
> files, SQL data base files, some types of graphics files such as .tif and
> .gif files will compress little if at all.
>
> So I find the results on tape vary a whole lot.
>
> ************************************************************************
> Wanda Prather
> The Johns Hopkins Applied Physics Lab
> 443-778-8769
> wanda_prather AT jhuapl DOT edu
>
> "Intelligence has much less practical application than you'd think" -
> Scott Adams/Dilbert
> ************************************************************************
>
>
>
>
>
> > -----Original Message-----
> > From: Long, Matt [SMTP:Matt.Long AT MARRIOTT DOT COM]
> > Sent: Monday, February 14, 2000 9:45 AM
> > To: ADSM-L AT VM.MARIST DOT EDU
> > Subject: Re: ADSM 9840 & Compression
> >
> > John,
> >
> > We are also seeing some bizzare compression rates with the 9840.
> > Some of our tapes are reporting over 80Gig of data. I don't know if this
> > is
> > a bug or what. We are using ADSM attached to an AIX RS6000. Thanks
> >
> > Matt Long
> > Systems Administration
> > Marriott International
> >
> >
> > -----Original Message-----
> > From: Doherty, John (ANFIS) [mailto:jdohe1 AT ANFIS.CO DOT UK]
> > Sent: Monday, February 14, 2000 5:46 AM
> > To: ADSM-L AT VM.MARIST DOT EDU
> > Subject: ADSM 9840 & Compression
> >
> >
> > ADSM ver 3 rel 1 level 2.20, device class defined as follows
> >
> > <<...>>
> >
> > What level of the ADSM server are you running?
> >
> > Have you specified "9840C" as the format when configuring your device
> > class?
> > (Q
> > DEVCLASS)
> >
> >
> > regards,
> >
> > Stuart Robertson
> > Unitech Open Systems Scotland
> >
> >
> > > John Doherty. Tel: +44 (0) 141 275 7793
> > > Fax: +44 (0) 141 275 9199
> > > Email: JDohe1 AT Anfis.co DOT uk
> > >
> > > Technical Specialist, Storage Management L02S
> > >
> > > Email communications are not necessarily secure and may be intercepted
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