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Clifford,
I have seen this, especially when backing up Oracle databases. It
really depends on the type of data that is being backed up as to how much
compress the drives actually can do; the 70GB is assuming 2:1 compression.
Not being an oracle dba, it looks like Oracle has a lot of "empty" space in
it's tables, depending on how it is configured I guess, so this space which
still gets counted as KB is easily compressed into almost nothing. This is
my opinion, though.
We have had no issues with restores from these backups/tapes.
Paul Weaver
-----Original Message-----
From: clifford thurber [mailto:cthurber AT concretemedia DOT com]
Sent: Friday, February 16, 2001 3:05 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Cc: nbu-lserv AT datastaff DOT com
Subject: [Veritas-bu] compression and DLT 7000
Hello,
We are using Netbackup 3.2 on Solaris 7 with Quantam DLT 7000 Drives. We
have the following line in our st.conf file
DLT7k-data = 1,0x36,0,0x9639,4,0x84,0x83,0x0,0x85,3;
Which I believe denotes that we have 70GB of storage in compressed mode. I
also believe that this is the theoretical limiton DLT 7000's using
compression. The confusing part is that when I run the media list report I
see tapes that are 87GB, 129GB and 111GB. Can someone tell me how this is
even possible? Veritas was not able to give me an answer to this? Thanks in
advance I will summarize.
Clifford
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
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<TITLE>RE: [Veritas-bu] compression and DLT 7000</TITLE>
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<P><FONT SIZE=3D2>Clifford,</FONT>
<BR> <FONT SIZE=3D2>I have =
seen this, especially when backing up Oracle databases. It really =
depends on the type of data that is being backed up as to how much =
compress the drives actually can do; the 70GB is assuming 2:1 =
compression. Not being an oracle dba, it looks like Oracle has a =
lot of "empty" space in it's tables, depending on how it is =
configured I guess, so this space which still gets counted as KB is =
easily compressed into almost nothing. This is my opinion, =
though.</FONT></P>
<P> <FONT SIZE=3D2>We have =
had no issues with restores from these backups/tapes. </FONT>
</P>
<P><FONT SIZE=3D2>Paul Weaver</FONT>
</P>
<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: clifford thurber [<A =
HREF=3D"mailto:cthurber AT concretemedia DOT com">mailto:cthurber@concretemedia=
.com</A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Friday, February 16, 2001 3:05 PM</FONT>
<BR><FONT SIZE=3D2>To: veritas-bu AT mailman.eng.auburn DOT edu</FONT>
<BR><FONT SIZE=3D2>Cc: nbu-lserv AT datastaff DOT com</FONT>
<BR><FONT SIZE=3D2>Subject: [Veritas-bu] compression and DLT =
7000</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>Hello,</FONT>
<BR><FONT SIZE=3D2>We are using Netbackup 3.2 on Solaris 7 with Quantam =
DLT 7000 Drives. We </FONT>
<BR><FONT SIZE=3D2>have the following line in our st.conf file</FONT>
<BR><FONT SIZE=3D2>DLT7k-data =3D =
1,0x36,0,0x9639,4,0x84,0x83,0x0,0x85,3;</FONT>
<BR><FONT SIZE=3D2>Which I believe denotes that we have 70GB of storage =
in compressed mode. I </FONT>
<BR><FONT SIZE=3D2>also believe that this is the theoretical limiton =
DLT 7000's using </FONT>
<BR><FONT SIZE=3D2>compression. The confusing part is that when I run =
the media list report I </FONT>
<BR><FONT SIZE=3D2>see tapes that are 87GB, 129GB and 111GB. Can =
someone tell me how this is </FONT>
<BR><FONT SIZE=3D2>even possible? Veritas was not able to give me an =
answer to this? Thanks in </FONT>
<BR><FONT SIZE=3D2>advance I will summarize.</FONT>
<BR><FONT SIZE=3D2>Clifford</FONT>
</P>
<P><FONT =
SIZE=3D2>_______________________________________________</FONT>
<BR><FONT SIZE=3D2>Veritas-bu maillist - =
Veritas-bu AT mailman.eng.auburn DOT edu</FONT>
<BR><FONT SIZE=3D2><A =
HREF=3D"http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu"; =
TARGET=3D"_blank">http://mailman.eng.auburn.edu/mailman/listinfo/veritas=
-bu</A></FONT>
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