Networker

Re: [Networker] TL891: tz89 or DLT7000? + Capacity problem (NW 6. * on NT)

2003-01-22 12:34:05
Subject: Re: [Networker] TL891: tz89 or DLT7000? + Capacity problem (NW 6. * on NT)
From: "Thomas, Calvin" <calvin.thomas AT NACALOGISTICS DOT COM>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Wed, 22 Jan 2003 09:33:50 -0800
A TZ89 is a dlt7000. The TZ89 is what Dec used to call the DLT7000. Use
either one interchangably.
Your tape size is 35GB. When you get 36-37GB, you are getting mostly
software compression before the data is sent to tape.  You are getting the
extra 1-2GB from the hardware compression on the tape.  To turn off Hardware
compression, you have to change a jumper, or switch on the tape drive.  To
turn off software compression, change the directives for your clients.  You
will probably find that they are about the same....
IE If you use hardware compression, networker can report 10 - 300% more
stored on each tape, but the actuall amount of data on each tape is about
the same.

Calvin Thomas
UNIX System Administration
NACA Logistics



-----Original Message-----
From: Vito Maltese [mailto:vito.maltese AT CONSILIUM.EU DOT INT]
Sent: Monday, January 20, 2003 2:04 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] TL891: tz89 or DLT7000? + Capacity problem (NW 6.*
on NT)


Hi and thanks for reading.

We have a Compaq TL891 w/ expansion unit (total 26 slots) w/ two DLT
drives (Digital tz89 / DLT7000). The sw is Networker 6.1.3 under Windows
NT.

It's in service since one year and in these last month we experienced some
problems with timeouts (solved thanks the reading of some older posts in
the list...). This led me to carefully examine the daemon.log and it
raised some questions.

1st question to the list about media type
- the media type used for both devices is "dlt7000". I can see that among
the media types there is "tz89". Does it make some difference in using one
or another? I tried to re-create my jukebox with jbconfig, but if I
use "Autodetected SCSI jukebox" I cannot choose the media type and it
takes automatically dlt7000.

2nd question to the list about capacity:
- in one year running the maximum capacity reached for one tape is around
37-38 Gb. Compression is active both on hardware and software side. The
main part of our backups is text documents. Can we expect to have more
capacity from one tape by modifying some configs?

Thanks for all possible help,

Vito Maltese

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