We will look into that, but as I said before, this server is a media server
and does not do any lan backups, so I don't think that the network card is
of any significance here. There is an Exchange and a file backup on this
node writing to tape directly attached to the server.






                                                                                
                                                       
                      "Steven L. Sesar"                                         
                                                       
                      <ssesar AT rcn DOT com>         To:       <Bruno.Bossier 
AT comparex DOT be>, "Robinson, Greg"                                 
                                                <greg.robinson AT 
dsto.defence.gov DOT au>                                                    
                      11/22/2002 23:41         cc:       veritas-bu AT 
mailman.eng.auburn DOT edu, veritas-bu-admin AT mailman.eng.auburn DOT edu    
                                               Subject:  Re: [Veritas-bu] 
Buffer settings                                              
                                                                                
                                                       




I've casually been reading this thread and see some familiar stuff. I met
with
Veritas on site today and they say that the Compaq teaming drivers are
notoriously problematic.


On Friday 22 November 2002 09:50 am, Bruno.Bossier AT comparex DOT be wrote:
> To summarize what everybody suggested :
>
> 1. Check the teaming driver
> 2. Check virusscanners
> 3. Check speed settings on the network card
> 4. Change buffer settings
>
> Thanks to everybody for their sugegstions. I asked our customer for the
> virusscanner as I know they are using one. I will also ask about the
> network card settings, but I'm sure that that is ok.
>
> I will soon look into the buffer settings. This server is a media server
> and thus does not transfer any data across the network, so I don't think
I
> need to look into network buffer settings. I also don't think that the
> teaming driver will have some effect here. I was more thinking about the
> tape buffer settings.
>
> Am I wrong when I say that changing a buffer setting as NET_BUFFER_SZ
won't
> make a difference in my case.
>
> What would be a recommendation for SIZE_DATA_BUFFERS and
> NUMBER_DATA_BUFFERS. Would that have an impact on e.g. my Exchange
mailbox
> backup ?
>
> Thanks,
> Bruno
>
>
>
>
>
>
>                       "Robinson, Greg"
>                       <[email protected].        To:
> veritas-bu AT mailman.eng.auburn DOT edu gov.au>                             
> cc:
>                       Sent by:                            Subject:  RE:
> [Veritas-bu] Buffer settings veritas-bu-admin AT mailman DOT eng
>                       .auburn.edu
>
>
>                       11/22/2002 02:11
>
>
>
>
>
>
> By any chance are you using compaq drivers for your NIC's?  And does it
> only
> break under heavy load (ie, a backup)?
>
> If so, then dump the comapq drivers and use the intel ones, and you
should
> get
> no network timeouts.
>
> Just so happens that our veritas consultant here today told me this
> yesterday.
> I don't have this situation, but I would believe him.
>
> Good luck.
>
> Greg.
>
> -----Original Message-----
> From: vidit kohli [mailto:vidit_k AT hotmail DOT com]
> Sent: Friday, 22 November 2002 3:12 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Buffer settings
>
>
> hey
>
> check your anti virus software on servers, we too had 41 network timed
out
> problems, then we upgraded to norton antivirus 7.6.1- which has a option
to
>
> avoid scanning files while backups are done,
> it also improved our EXCH and file system backup performance
>
> also we forced full duplex 100MBS on compaq 2000/NT server nic card
>
> cheers
>
> vk
>
>
>
>
>
>
> From: <Bruno.Bossier AT comparex DOT be>
> To: "Vapiwala, Kevin V [IT]" <kevin.v.vapiwala AT citigroup DOT com>
> CC: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Buffer settings
> Date: Thu, 21 Nov 2002 17:27:27 +0100
>
>
> It's a Compaq network card and there is teaming, but I don't know exactly
> how many ports there are. This is for a customer of ours. I will also
check
> with them tomorrow for the network settings, but they should be 100Mbit
> Full Duplex on both the card and the network port.
>
> This server is a media server and only backs up itself. There is a fibre
> connection via a Qlogic card to a Brocade switch where an ATL P7000 is
also
> connected to via 3 fibre connections. I don't think we have to look into
> that direction as we get network timeouts (status 41).
>
>
>
>
>
>
>
>                        "Vapiwala, Kevin V
>                        [IT]"                        To:
> "'Bruno.Bossier AT comparex DOT be'" <Bruno.Bossier AT comparex DOT be>,
>                        <kevin.v.vapiwala@cit
> veritas-bu AT mailman.eng.auburn DOT edu
>                        igroup.com>                  cc:
>                                                     Subject:  RE:
> [Veritas-bu] Buffer settings
>                        11/21/2002 17:11
>
>
>
>
>
>
> What is the NIC on those machines? Are they gigabit Ethernet? if not are
> the
> teamed 100mbit ?
>
> Kevin
>
> -----Original Message-----
> From: Bruno.Bossier AT comparex DOT be [mailto:Bruno.Bossier AT comparex DOT 
> be]
> Sent: Thursday, November 21, 2002 10:44 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] Buffer settings
>
>
> Environment : Netbackup Datacenter 4.5 MP1, master on W2K and media
servers
> on W2K and NT, 4 SSO drives
>
> We are experiencing some performance problems. Most of the backups run,
but
> we don't get the speed we expect. There is one specific server (W2K)
which
> has an Exchange agent configured for individual mailbox backups (about
2700
> mailboxes). That backup takes a very long time, but it works (about 11
> hours for almost 60Gb). There is also a normal file backup scheduled and
> that one never works. The backup starts and after a while aborts with
code
> 41 (network timeout). Sometimes the backup not even starts.
>
> I found some documents on the Veritas support site which talks about
> several buffer settings. However, these documents are for Netbackup 3.4.
>
> Are there some recommendations for these buffer settings ? I'm especially
> looking at tape buffer settings (SIZE_DATA_BUFFERS and
NUMBER_DATA_BUFFERS)
> as this specific server is a media server with no clients attached to it
> and thus only backups itself.
>
> Bruno
>
>
>
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>
>
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