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ESXi and SFU 3.5

Posted on 2009-04-15
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Last Modified: 2013-12-19
We are running a Windows 2003 Standard server as a vm using VMware ESXi.  This server is running service for unix 3.5.  We have 2 NFS shares setup on the Windows server which exports to 2 other Unix servers.  The VM is setup using 4GBs of ram and 4 processor running at 2.4Ghz a piece.  We are noticing high CPU utiliaztion with the rpcxdr.sys driver which is used primarliy for SFU.  CPU will spike to over 90% and users notice slowness accessing server.  Is there anything I can do to decrease the overhead used by SFU and is there any known problems using SFU with VMWare ESXi?  Any ideas would be very helpful.  Thanks  
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Question by:isgrot
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Expert Comment

by:gheist
ID: 24149224
It is DNS server timeout - quite popular in common AD scenarios.
All the "transparent" "background" DNS synchronisations causes that.
I would suggest running NFS on Linux or BSD as it is intended to be.
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by:isgrot
ID: 24149368
Unfortuanaltly, this is the setup we have and need to stick with for the time being.  Are you saying DNS lookups cause the CPU to spike?  Are there any work arounds to this problem?
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by:gheist
ID: 24149600
DNS cache in front of AD DNS server, running BIND on Linux (mandriva or ubuntu for easy setup in ESXi)
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Author Comment

by:isgrot
ID: 24149673
So you think I should setup a Linux VM to NFS to Unix servers and have Windows pull files from there?
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by:gheist
ID: 24149761
You have to install DNS cache to cover AD DNS defect (or make DNS and Users synchronize nightly)
Basically Windows NFS is not getting machine name from IP and polls connection eating out CPU time.
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Author Comment

by:isgrot
ID: 24149792
What if I setup mounts in Unix to connect directly to IP and not hostname?
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by:gheist
ID: 24149904
It queries for name of client IP.
It is really minimal Linux installation, which saves the day when you reboot or break AD controller(s)
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by:isgrot
ID: 24150459
This setup is just not visable for our network.  We are limited to what we can setup due to secuirty issues.  Are there any tweaks that can be made with SFU to reduce the amount of overhead it uses?  
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by:gheist
ID: 24150530
NO, no tweaks, maybe "Microsoft Update" knows better.
I cannot promise this is solution: http://www.microsoft.com/downloads/details.aspx?FamilyId=70ae23c2-3ae8-4ea6-ba8d-8ac7e4f82663&displaylang=en

You can actually install DNS service on host to cache AD DNS records.
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Author Comment

by:isgrot
ID: 24150850
"You can actually install DNS service on host to cache AD DNS records."

This is interesting idea.  So I would install DNS on my Windows VM and set it to cache records?  How do you setup a DNS server to just cache for that host?  This cannot run full DNS becuase it will violate security policy here.  I know I sound like a broken record but we have to be careful what we install here.
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gheist earned 500 total points
ID: 24150900
Ask your security policemen to elaborate...
You just have to run DNS service with forwarders being AD masters...
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