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IBM and Compaq servers vs. Dell PowerEdge servers

I'm facing some performance problems in my current company. We use Dell PowerEdge servers. In my last company we used IBM (Intel based) and Compaq servers. It seems that the Dells are not as powerful as the others, with comparable CPU, memory and disk. I have no real data, this is just my personal feeling. Do you know where I can find reliable data?
This is the old adage, "Perception is reality." In theory, they should be the same. However, your experience says differently. You really need to decide if you are comparing apples to apples. Is there the same number of people as the previous place? How about mail file sizes? Are the Domino versions the same? Are the OS patches identical? Is there full-text indexing, trans logging, agents, etc., running here that weren't there?

I have used most major brands of hardware, and systems with identical hardware (down to RAID controller memory) that performed the same when presented with very similar loads. I have to say that in my travels HP/Compaq is the choice of most shops, followed by IBM with Dell a distant third. Perhaps there is a reason for this.

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