<br><tt><font size=2>Devon,</font></tt>
<br>
<br><tt><font size=2>Good to hear that T2000's are screamers.</font></tt>
<br>
<br><tt><font size=2>What are the library/tape drive specs. Are the drives
FC attached? or are they attached via scsi to the media server?</font></tt>
<br>
<br><tt><font size=2>Thanks,</font></tt>
<br><tt><font size=2>Karl</font></tt>
<br>
<br><tt><font size=2>> From: veritas-bu-bounces@mailman.eng.auburn.edu
[mailto:veritas-bu-<br>
> bounces@mailman.eng.auburn.edu] On Behalf Of Peters, Devon C<br>
> Sent: Wednesday, October 17, 2007 12:12 PM<br>
> To: VERITAS-BU@mailman.eng.auburn.edu<br>
> Subject: [Veritas-bu] Some info on my experiences with 10GbE</font></tt>
<br><tt><font size=2>> </font></tt>
<br><tt><font size=2>> Since I've seen a little bit of talk about 10GbE
on here in the past<br>
> I figured I'd share some of my experiences... </font></tt>
<br><tt><font size=2>> I've recently been testing some of Sun's dual-port
10GbE NICs on <br>
> some small T2000's (1Ghz, 4-core). I'm only using a single port
on <br>
> each card, and the servers are currently directly connected to each
<br>
> other (waiting for my network team to get switches and fibre in place).</font></tt>
<br><tt><font size=2>> So far, I've been able to drive throughput between
these two systems<br>
> to about 7500Mbit/sec using iperf. When the throughput gets
this <br>
> high, all the cores/threads on the receiving T2000 become saturated
<br>
> and TCP retransmits start climbing, but both systems remain quite
<br>
> responsive. Since these are only 4-core T2000's, I would guess
that<br>
> the 6 or 8-core T2000's (especially with 1.2Ghz or 1.4Ghz <br>
> processors) should be capable of more throughput, possibly near line
speed.</font></tt>
<br><tt><font size=2>> The down side achieving this high of throughput
is that it requires <br>
> lots of data streams. When transmitting with a single data stream,
<br>
> the most throughput I've gotten is about 1500Mbit/sec. I only
got <br>
> up to 7500Mbit/s when using 64 data streams… Also, the biggest
<br>
> gains seem to be in the jump from 1 to 8 data streams; with
8 <br>
> streams I was able to get throughput up to 6500Mbit/sec.</font></tt>
<br><tt><font size=2>> Our goal for 10GbE, is to be able to restore
data from tape at a <br>
> speed of at least 2400Mbit/sec (300MB/sec). We have large daily
<br>
> backups (3-4TB) that we would like to be able to restore (not <br>
> backup) in a reasonable amount of time. These restores are used
to <br>
> refresh our test and development environments with current data. <br>
> The actual backups are done with array based snapshots (HDS <br>
> ShadowCopy), which then get mounted and backed up by a dedicated <br>
> media server (6-core T2000). We're currently getting about <br>
> 650MB/sec of throughput with the backups (9 streams on 3 LTO3 tape
<br>
> drives - MPX=3 and it's very compressible data).</font></tt>
<br><tt><font size=2>> Going off my iperf results, the restoring this
data using 9 streams <br>
> should get us well over 2400Mbit/sec. But - we haven't installed
<br>
> the cards on our media servers yet, so I have yet to see what the
<br>
> actual performanee of netbackup and LTO3 over 10GbE is. I'm
hopeful<br>
> it'll be close to the iperf results, but if it doesn't meet the goal<br>
> then we'll be looking at other options.</font></tt>
<br><tt><font size=2>> -- <br>
> Devon Peters _______________________________________________<br>
> Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu<br>
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu<br>
</font></tt>