RE: Strange performance

  • From: "Darko Kljajic" <darko@xxxxxxxxxxxxxxxx>
  • To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
  • Date: Sat, 22 Jan 2005 13:19:36 +0100

I already implemented that solution (for DNS name resolution) on downstream isa 
servers. 

(I repeat) Everything works just fine until isa start to work slow for no 
reason. 

When I saw ISA to slow down I instantly log on to upstream isa servers and I 
saw that upstream servers were bottleneck. Those two servers alone cannot 
retrive pages fast (they are not cache servers). 

ISA works fast and 10 min extra slow â fast â slow â
I spent so much time for this project and I donât want to see that ISA work 
slow for no reason. â

Darko KljajiÄ
Administrator for operating systems
IT Department
tel: +381 11 201 1567
mob: +381 64 811 1655
e-mail: darko@xxxxxxxxxxxxxxxx
===========================
Delta Banka A.D.
Milentija PopoviÄa 7b, Belgrade
Serbia & Montenegro
site: www.deltabanka.co.yu
===========================
________________________________________
From: josephk [mailto:josephk@xxxxxxxxx] 
Sent: 21. januar 2005 20:39
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Strange performance

http://www.ISAserver.org
Hi  Darko,

I run back to back networks with ISA and donâtâ have the slowness problem. 
I do sometimes receive pages that are garbled and look like binary 
representations of the pages and or items that I was trying to download.
After I refresh my page that disappears.  Not sure if this is related to 
caching on ISA or not.  The other issue is how the front end ISA is using DNS 
to get pages or to your backend ISA. And then again from your backend ISA out 
to the front-end ISA and external network. Thomas showed me this link which 
helped on speed 
http://www.microsoft.com/technet/prodtechnol/isa/2004/plan/disablenameresolution.mspx
  and DNS resolution.

Thank you,

Joseph


________________________________________
From: Ball, Dan [mailto:DBall@xxxxxxxxxxx] 
Sent: Friday, January 21, 2005 10:41 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Strange performance

http://www.ISAserver.org
I donât know why this happens, but I have seen it happen here.  In fact, I 
had an open support case with Microsoft at the time about this, and sent them 
diagnostic logs while it was happening, which they are still perusing.

________________________________________
From: Darko Kljajic [mailto:darko@xxxxxxxxxxxxxxxx] 
Sent: Friday, January 21, 2005 12:42
To: [ISAserver.org Discussion List]
Subject: [isalist] Strange performance

http://www.ISAserver.org
Hi to all,

I have installed four ISA Servers 2004 in back to back configuration. (test 
prepare to go live)
I have two downstream isa servers with NIC Teming for every network and NLB 
only for Internal network (caching servers) + two upstream isa servers also 
with NLB and Teaming.

Everything works fine (almost perfectly) â until ISAs suddenly get lazy. ISAs 
retrive sites so slowly that everyone start to complain.

I look up in router log (router to internet provider) and I saw that our link 
have always spare 100 kbytes/s. So I supposed that network bandwidth isnât a 
problem. I also look in ISAs performance counters and everything looks fine 
(COLD).  

I do all the tuning for operating systems (3GB switch â) and I give 
downstream ISAs to use 50% of memery for caching. 

Does anyone have a clue what is happening?? 

Hardware configuration (4 servers):
2 x 3.06GHz 
4GB RAM
256 MB SCSI Controler
3 x 36GB Hard Disks
4 (6) NIC

PS: NLB works with Layer3 Switch

Darko KljajiÄ
Administrator for operating systems
IT Department
tel: +381 11 201 1567
mob: +381 64 811 1655
e-mail: darko@xxxxxxxxxxxxxxxx
===========================
Delta Banka A.D.
Milentija PopoviÄa 7b, Belgrade
Serbia & Montenegro
site: www.deltabanka.co.yu
===========================




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