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Thanks for you response John, I will definitely put your info to use.
Cecil
-----Original Message-----
From: Johnny Oestergaard [mailto:joe AT joe DOT net]
Sent: Saturday, August 16, 2003 6:52 PM
To: Cecil Hypolite; veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Backup dilemma
I can't see anything wrong in the calculations except that you can't expect
to get 100Mbit/s data over a normal 100Mbit/s network.
The most simple way to solve part of your problem is to buy a Gbit switch
and some Gbit NIC's.
You could also attach the tape drives directly to the server and install a
media server on it (but that cost more then buying a small Gbit/s switch)
/johnny
At 16:23 16-08-2003 -0400, Cecil Hypolite wrote:
>Hi all, I have a little backup dilemma and I wish to get some help on
>
>I have to do a weekly full backup of a system that has 17 partitions and
>about 500 GB of data. The backup will be done on the weekend, when there
are
>few other jobs running. Here are some specs:
>network: 100 MB/sec (12.5 MB/sec)
>SCSI-2 connection : (40 MB/sec)80 MB/sec (two drives)
>Drives: 2 SDLT220's 79.2 GB/hr
>Produce: Netbackup Datacenter 4.5
>
>It seems that the network is a bottle neck as it can only transfer 45 Gb/hr
>(3600 *(12.5 MB/sec) = 45 GB/hr)
>With that network transfer speed of 45 GB/hr I should be able to back this
>500 GB of data within a 12 hour window (11.2 hours to be exact), are my
>calculations correct?
>
>-Also since the network transfer speed is only 45 Gb/hr I should not
>implement multiplexing, as one of the drives will start "shoe shining"
>because the network cannot sustain a transfer rate of 79.2 GB.hr. Is this
>correct?
>
>Any suggestions will be greatly appreciated.
>Thank you,
>Cecil Hypolite
>
>_______________________________________________
>Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
>http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
_______________________________________________
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] Backup dilemma</TITLE>
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<P><FONT SIZE=3D2>Thanks for you response John, I will definitely put =
your info to use.</FONT>
<BR><FONT SIZE=3D2>Cecil</FONT>
</P>
<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Johnny Oestergaard [<A =
HREF=3D"mailto:joe AT joe DOT net">mailto:joe AT joe DOT net</A>] </FONT>
<BR><FONT SIZE=3D2>Sent: Saturday, August 16, 2003 6:52 PM</FONT>
<BR><FONT SIZE=3D2>To: Cecil Hypolite; =
veritas-bu AT mailman.eng.auburn DOT edu</FONT>
<BR><FONT SIZE=3D2>Subject: Re: [Veritas-bu] Backup dilemma</FONT>
</P>
<P><FONT SIZE=3D2>I can't see anything wrong in the calculations except =
that you can't expect </FONT>
<BR><FONT SIZE=3D2>to get 100Mbit/s data over a normal 100Mbit/s =
network.</FONT>
</P>
<P><FONT SIZE=3D2>The most simple way to solve part of your problem is =
to buy a Gbit switch </FONT>
<BR><FONT SIZE=3D2>and some Gbit NIC's.</FONT>
</P>
<P><FONT SIZE=3D2>You could also attach the tape drives directly to the =
server and install a </FONT>
<BR><FONT SIZE=3D2>media server on it (but that cost more then buying a =
small Gbit/s switch)</FONT>
</P>
<P><FONT SIZE=3D2>/johnny</FONT>
</P>
<P><FONT SIZE=3D2>At 16:23 16-08-2003 -0400, Cecil Hypolite =
wrote:</FONT>
<BR><FONT SIZE=3D2>>Hi all, I have a little backup dilemma and I =
wish to get some help on</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>>I have to do a weekly full backup of a system =
that has 17 partitions and</FONT>
<BR><FONT SIZE=3D2>>about 500 GB of data. The backup will be done on =
the weekend, when there are</FONT>
<BR><FONT SIZE=3D2>>few other jobs running. Here are some =
specs:</FONT>
<BR><FONT SIZE=3D2>>network: 100 MB/sec (12.5 MB/sec)</FONT>
<BR><FONT SIZE=3D2>>SCSI-2 connection : (40 MB/sec)80 MB/sec (two =
drives)</FONT>
<BR><FONT SIZE=3D2>>Drives: 2 SDLT220's 79.2 GB/hr</FONT>
<BR><FONT SIZE=3D2>>Produce: Netbackup Datacenter 4.5</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>>It seems that the network is a bottle neck as it =
can only transfer 45 Gb/hr</FONT>
<BR><FONT SIZE=3D2>>(3600 *(12.5 MB/sec) =3D 45 GB/hr)</FONT>
<BR><FONT SIZE=3D2>>With that network transfer speed of 45 GB/hr I =
should be able to back this</FONT>
<BR><FONT SIZE=3D2>>500 GB of data within a 12 hour window (11.2 =
hours to be exact), are my</FONT>
<BR><FONT SIZE=3D2>>calculations correct?</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>>-Also since the network transfer speed is only =
45 Gb/hr I should not</FONT>
<BR><FONT SIZE=3D2>>implement multiplexing, as one of the drives =
will start "shoe shining"</FONT>
<BR><FONT SIZE=3D2>>because the network cannot sustain a transfer =
rate of 79.2 GB.hr. Is this</FONT>
<BR><FONT SIZE=3D2>>correct?</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>>Any suggestions will be greatly =
appreciated.</FONT>
<BR><FONT SIZE=3D2>>Thank you,</FONT>
<BR><FONT SIZE=3D2>>Cecil Hypolite</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><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>
</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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