Jetstress: Disk sub-system thresholds
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:
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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) |
100 |
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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