Server Performance Monitoring Tool

I am looking for a tool that will centrally monitor the performance of my Windows and Linux (RHEL) servers.  I have been searching for a while and hve not found anything that will specifically meet that need and I know there are many tools out there.  I am already using WhatsUp for notification monitoring but I need something that will collect historical information as well as real time view like a network monitor but for servers.

Can someone recommend a tool that is on the inexpensive side?

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Dushan De SilvaTechnology ArchitectCommented:
Best is "Big Brother"

BR Dushan
nagios has alot of add-ons and tools floating around out there.

Also its open source...
anyone who has used solarwinds will tell you it is well worth the money.

great interface, easy to setup/add servers, do reports etc.

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Ill give nagios another nod. Excellent piece of software. There is a web management interface called NagiosQL which makes things a bit easier if your not a fan of large config files.


GregWayAuthor Commented:
I am actually looking for a Windows app.
ugh a windows guy. :P Windows and inexpensive dont belong in the same sentence.

I'd go with big brother then.  See dushan's commet.

Dushan De SilvaTechnology ArchitectCommented:
Big Brother is having Win32 Version.
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