Networker

Re: [Networker] Data Compression

2003-07-07 17:34:57
Subject: Re: [Networker] Data Compression
From: Mukesh Ghildiyal <MGhildiyal AT WYSE DOT COM>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Mon, 7 Jul 2003 14:34:53 -0700
Thanks for the reply,

But I used to get 140 even while I was using dlt 7000 and that was best 
compression (its all oracle files, which gets max. compression). I wonder for 
that matter, why I am not getting that on super DLTs. I am still getting the 
same capacity.



Thanks much,


Mukesh


-----Original Message-----
From: O'Brien, Pat [mailto:Pat.Obrien AT CHOICEPOINT DOT COM]
Sent: Monday, July 07, 2003 1:47 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] Data Compression


A 110/220 tape is 110 native 220 under best case compression.  I too have
these drives, and get 85 to 175 gb depending on data backup.  Depending
because there are time which I back up compressed data (gzipped, tarred,
cpio, or compressed), and others where just plain text which gets great
compression.

-----Original Message-----
From: Mukesh Ghildiyal [mailto:MGhildiyal AT WYSE DOT COM]
Sent: Monday, July 07, 2003 3:29 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] Data Compression


Hello networker partners,

I have a data compression issue. Let me tell what I have

Library :  Storagetek L180 with  6 SDLT drives
Server:  HPUX 10.20
Connnection: 2 HSC scsi cards connecting to 6 drives (3 each) and one HPPB
card attached to Jukebox
Tapes: SDLT (Fuji & Maxell)  says 160gb/320gb SDLT 320 and 110gb/220gb SDLT
220

  My question is:

I believe we are at SDLT 220 and I am backing up to this library my oracle
application and database. I am not using software compression and depend on
hardware compression I have drives configured as
/dev/rmt/c2t2d0BESTnb

When I backup I am only getting 140gb in each tapes whereas I expect at
least 200 to 220 gb per tape. Please let me know if there is any setting at
the library  to achieve the required compression or at the O/S level???



Thank you very much in advance.


Mukesh

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