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VMware VM performance comapre to same configuration physical server

We are planning to move 8 physical servers (dual core 2.x, 8 GB memory, 250 GB HDD, OS: Linux and windows 2003) to VM environment using VMware, but I am worried on VM performance. Our java application needs good IO to perform better

Questions
1.      To achieve similar performance in VM, how should I configure VMware ?
2.      Can I get one big server to accommodate all 8 servers or 2 or 3 servers?
3.       How many SCSI interfaces or SAN interfaces should I buy?

SOLUTION

ryder0707

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David

Need a LOT more information. Get specific on the I/O load for each O/S & application. The biggie is optimizing for throughput is almost mutually exclusive with optimization for IOPs. What is mix of read, write, random, sequential, small-block (4KB), largeblock(64KB) I/Os?

How many interfaces? stop buying them when you saturate the bus or interface. How many disks? DO you care about redundancy? Any particular budget? How many GB or TB? Do you mean SCSI from the physical connection perspective, or SCSI protocol, which allows for SAS? SAN interfaces pretty much imply fibre channel?

Once can certainly buy a single computer that has sufficient cores, memory bandwidth, and I/O capability to do the job, but do you want all of your eggs in one basket?

I find it surprising that ANY java app would be I/O bound .. Java is almost always slow due to insufficient CPU resources.

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burdcell

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mnchandra2009

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thank you all