A buddy of mine [Liang Yang] recently shared the following table with me and I thought you might also find it useful with trying to simulate various workloads.  In particular when testing and evaluating Hyper-V.

A tool like IOMeter [from www.iometer.org] can be programmed with the mixes of reads/wrtes and sequential/random IO's detailed below.

Workload Category

I/O Size

Percentage of READ vs. WRITE

Percentage of RANDOM vs. SEQUENTIAL

Web File Server

4KB

95% RD vs. 5% WR

75% RAND vs. 25%  SEQ

Web File Server

8KB

95% RD vs. 5% WR

75% RAND vs. 25%  SEQ

Web File Server

64KB

95% RD vs. 5% WR

75% RAND vs. 25%  SEQ

Decision Support System DB

1MB

READ

RANDOM

Media Streaming

64KB

98% RD vs. 2% WR

SEQUENTIAL

SQL Server Log

64KB

WRITE

SEQUENTIAL

OS Paging

64KB

90% RD vs. 10% WR

SEQUENTIAL

Web Server Log

8KB

WRITE

SEQUENTIAL

OLTP DB

8KB

70% RD vs. 30% WR

RANDOM

Exchange Server

4KB

67% RD vs. 33% WR

RANDOM

Workstation

8KB

80% RD vs. 20% WR

80% RAND vs. 20% SEQ

Video on Demand

512KB

READ

RANDOM

 Enjoy - Tony Voellm