------=_Part_1037_28066580.1142893630476
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

With LTO3, you *really* ought to be using disk staging if at all possible.
As someone already stated, the minimum speeds are quite high.  For IBM LTO3=
,
it's 40MB/sec.  If you can't meet the mimimum speeds you're going to
prematurely wear out your tapes and drives and of course, you're not making
good use of these awesome drives.  I'm using Linux staging media servers an=
d
seeing up to 160MB/sec for 2GB fragments.  With this throughput, one drive
per media server does quite nicely.

 cat /usr/openv/netbackup/NET_BUFFER_SZ
65536

was the single most important tweak I made to get better performance with
these drives.

On 3/20/06, Atif Munir <atif76 AT gmail DOT com> wrote:
>
> I have a gigabit ethernet. Recently i have installed 5 LTO Gen 3
> drives. But I am not getting a very good speed. As a total I am
> getting 100Mb/sec, and it take a lot of time to finish my backup.
>
> Why I could not get a good speed.
>
> Regards,
> atif
>
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>



--
-Tim

------=_Part_1037_28066580.1142893630476
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

With LTO3, you *really* ought to be using disk staging if at all possible.&=
nbsp; As someone already stated, the minimum speeds are quite high.&nbsp; F=
or IBM LTO3, it's 40MB/sec.&nbsp; If you can't meet the mimimum speeds you'=
re going to prematurely wear out your tapes and drives and of course, you'r=
e not making good use of these awesome drives.&nbsp; I'm using Linux stagin=
g media servers and seeing up to 160MB/sec for 2GB fragments.&nbsp; With th=
is throughput, one drive per media server does quite nicely.
<br><br>&nbsp;cat /usr/openv/netbackup/NET_BUFFER_SZ<br>65536<br><br>was th=
e single most important tweak I made to get better performance with these d=
rives.<br><br><div><span class=3D"gmail_quote">On 3/20/06, <b class=3D"gmai=
l_sendername">
Atif Munir</b> &lt;<a href=3D"mailto:atif76 AT gmail DOT com">atif76 AT gmail 
DOT com</a>=
&gt; wrote:</span><blockquote class=3D"gmail_quote" style=3D"border-left: 1=
px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"=
>I have a gigabit ethernet. Recently i have installed 5 LTO Gen 3
<br>drives. But I am not getting a very good speed. As a total I am<br>gett=
ing 100Mb/sec, and it take a lot of time to finish my backup.<br><br>Why I =
could not get a good speed.<br><br>Regards,<br>atif<br><br>________________=
_______________________________
<br>Veritas-bu maillist&nbsp;&nbsp;-&nbsp;&nbsp;<a href=3D"mailto:Veritas-b=
u AT mailman.eng.auburn DOT edu">Veritas-bu AT mailman.eng.auburn DOT 
edu</a><br><a href=
=3D"http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu";>http://mailm=
an.eng.auburn.edu/mailman/listinfo/veritas-bu
</a><br></blockquote></div><br><br clear=3D"all"><br>-- <br>-Tim

------=_Part_1037_28066580.1142893630476--