Performance counter thresholds are updated. But, there are some differences from Exchange 2003 Performance Troubleshooting Guide for some reasons.
Database Disks:
· Average Disk sec/Read (or I/O Database Reads Average Latency): The average should be below 20 ms. Spikes (maximum values) should not be higher than 50 ms; more than 6 violations fail the test.
Transactional Log Disks:
· Average Disk sec/Write (or I/O Log Writes Average Latency): The average should be below 10 ms. Spikes (maximum values) should not be higher than 50 ms; more than 6 violations fail the test.
Here are the latest performance counter thresholds:
Disk Sub-system Thresholds
Performance
Stress
Troubleshooting Guide
Data Disk Read Latency (average)
20 ms
Data Disk Read Latency (maximum)
50 ms
100 ms
Data Disk Write Latency (average)
(n/a)
Data Disk Write Latency (maximum)
Log Disk Read Latency (average)
5 ms
Log Disk Read Latency (minimum)
Log Disk Write Latency (average)
10 ms
Log Disk Write Latency (maximum)
Host Computer Thresholds
Performance/Stress
% Processor Time (maximum)
90%
% Processor Time (average)
80%
Available Memory Bytes (minimum)
50 MB
Page Table Entries (minimum)
5000
Transition Pages Repurposed/Sec (average)
100
Memory Pages Per Sec (average)
Pool Nonpaged Bytes (maximum)
75 MB
Pool Paged Bytes (maximum)
180 MB
Database Page Fault Stalls Per Sec (average)
1.0
Reference: Troubleshooting Exchange Server 2003 Performance
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