With full duplex you can pretty much reach the bandwidth of 100BaseT
12.5MB/sec both for send and receive traffic. So in the case of a restore
going through the same NIC as a backup and you are running a master/media
server in half duplex mode you're throttling your bandwidth. I.E. your can
reach approximately 11Mbytes/sec for your backup and if in full duplex
11Mbytes/sec for the restore. If half-duplex the backup and restore will run
approximately 6Mbytes/sec each, effectively slowing down each job. Your
mileage will vary on the actual numbers.
Gary Andresen
Impossible Happens, Plan Ahead
Pacific Northwest Data Inc.
Tel: 503.701.5185
Fax: 503.692.3910
gary.andresen AT pnwdata DOT com
www.pnwdata.com
> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu [mailto:veritas-bu-
> admin AT mailman.eng.auburn DOT edu] On Behalf Of King, Cheryl
> Sent: Thursday, March 18, 2004 9:00 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Is there an official document of client and
> server N ICand switch settings
>
> Thank you all for your help and comments, and for feeling my pain. I will
> compile my own official document from the information in these emails and
> from experience. I'm still wondering why we have all HPs set to half
> duplex. I was told this was the recommendation from the vendor, I think
> HP, but I'll bring this up again.
>
> Are other people successfully running NBU 4.5 with HP-UX 10.20 and HP-UX
> 11.00 clients set for Full Duplex? If so, I'll test one and see how it
> goes.
>
> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Paul
> Boatman
> Sent: Thursday, March 18, 2004 6:33 AM
> To: Dwayne.Brzozowski AT mail.va DOT gov; veritas-bu AT mailman.eng.auburn
> DOT edu
> Subject: Re: [Veritas-bu] Is there an official document of client and
> server N ICand switch settings
>
>
> I work at the 6th largest university in the country. About 1 year ago,
> the entire university was required to switch to AUTO-AUTO across ALL
> platforms because of network infrastructure changes ("eek !"). The
> impact on Veritas Netbackup has been ridiculous. Our drives are sitting
> here getting 10%-20% thruput, and our capacity is maxed out when it
> shouldn't be. Tape management and load balancing between 2 robots (1 of
> which is maxed out tape-wise, the other is maxed out drive-wise) is a
> nightmare. Upper management is blaming the software, scheduler, and
> drive technology claiming that they are not sufficient.
>
> Is anyone else in a similar situation ?
>
> What are the "settings that work" Dwayne ? I am very interested.
> Maybe we could present this info to our Network / Telecom guys. By the
> way Dwayne, I am a veteran so I sure do appreciate you guys in the VA.
>
> Thanks,
>
> Paul
>
> >>> "Biller, Tim" <Tim.Biller AT uk.experian DOT com> 3/18/2004 02:55:30 >>>
> Hi Cheryl,
>
> Have the Network Admins lock the switch port speed to 100Mbit and Full
> Duplex and make sure the client NIC is set exactly the same on ALL the
> servers. The Unix boxes will need setting explicitly as Mark says, and
> a
> file added to ensure they stay that way after a reboot. (Your
> sysadmins
> should know this....)
>
> Most network switches always auto-negotiate to the lowest possible
> speed so
> it's essential to lock this down. Any decent network admin should
> know
> this....
>
> Are you running on a dedicated backup LAN? If there's no impact on
> other
> systems there's absolutely no reason not to max out the ports and NICs.
>
>
> I'm not aware of any specific documentation that states that 100/Full
> should
> be used but if performance sucks under autoneg and it flies under
> 100/Full
> then there's your argument. What tape drives are you using? Are you
> using
> SSO?
>
> Cheers - Tim
>
>
> Date: Wed, 17 Mar 2004 12:03:10 -0700
> From: "King, Cheryl" <cheryl.king AT intrado DOT com>
> To: "Veritas-Bu \(E-mail\)" <veritas-bu AT mailman.eng.auburn DOT edu>
> Subject: [Veritas-bu] Is there an official document of client and
> server NIC
> and switch settings
>
> Over and over again we have problems with poor performance with new
> client
> backups and restores. Is there a document that says what the NIC
> settings
> should be for each client type? For example we have highest speed
> possible
> for all of them, half duplex for HP, and full duplex for everything
> else, I
> think (I haven't checked every system and wasn't here when some were
> implemented). Setting Auto detect on the switch seems to not work
> correctly
> (causes slow performance). I think the switches are set to match the
> server, but have no way to verify that. I'd like to be able to present
> an
> official document to the System Administrators and the Network
> Engineers
> that states the correct configuration requirements. Does Veritas have
> such
> a document or statement?
>
> Is this a problem in other environments? Is this just an issue in
> Veritas
> Backup environments? Are my SAs and Network Engineers not following
> some
> industry, standard, best-practices? I've been in IT for many years
> but
> working with Veritas NBU for 1 year. I don't recall ever having
> network
> issues like this before.
>
> NBU 4.5 FP5 Solaris 8 Master/Media
> Clients OSF1_V5, HP-UX 11.00, HP-UX10.20, Windows2000, WindowsNT,
> RedHat2.4,
> RedHat 2.2, Solaris8, Solaris7.
>
> Thanks in advance.
>
> Cheryl King
>
>
> From: "Donaldson, Mark" <Mark.Donaldson AT experianems DOT com>
> To: "'King, Cheryl'" <cheryl.king AT intrado DOT com>,
> "Veritas-Bu (E-mail)"
> <veritas-bu AT mailman.eng.auburn DOT edu>
> Subject: RE: [Veritas-bu] Is there an official document of client and
> serv
> er NIC and switch settings
> Date: Wed, 17 Mar 2004 12:31:48 -0700
>
> The network settings are outside Netbackup control.
>
> You should always set to your highest possible speeds. For many
> server/switch combinations, auto-negotiation fails to negotiate the
> highest
> settings and they must often be forced to the best setting using ndd
> or
> similar utilities.
>
> Half-duplex performance stinks - are you sure that's what only what HP
> can
> do?
>
> Your network person should be able to query a smart-enough switch for
> the
> switch port settings, the SA should be able to query the ethernet port
> for
> the same settings.
>
>
> This e-mail has come from Experian International: winner of the UK's
> National Business of the Year Award 2003.
>
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