400 DS8800 Performance Monitoring and Tuning
priority control. The prioritization code has some processing overhead and can be disabled
for disks that are targeted for similar I/O activities, such as databases.
I/O completion and cancellation
The Windows Server 2008 I/O subsystem provides a more efficient way to manage the
initiation and completion of I/O requests, resulting in a reduced number of context switches,
lower CPU utilization, and reduced overall I/O response time.
I/O request size
The maximum I/O size was increased from 64 KB per I/O request in Windows Server 2003 to
1024 KB in Windows Server 2008. For large sequential workloads, such as file shares or
backups, this increase can improve the disk throughput.
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