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:
|
Disk Sub-system Thresholds |
Performance |
Stress |
Troubleshooting Guide |
|
Data Disk Read Latency (average) |
20 ms |
20 ms |
|
Data Disk Read Latency (maximum) |
50 ms |
100 ms |
50 ms |
|
Data Disk Write Latency (average) |
(n/a) |
20 ms |
|
Data Disk Write Latency (maximum) |
50 ms |
|
Log Disk Read Latency (average) |
(n/a) |
5 ms |
|
Log Disk Read Latency (minimum) |
50 ms |
|
Log Disk Write Latency (average) |
10 ms |
10 ms |
|
Log Disk Write Latency (maximum) |
50 ms |
100 ms |
50 ms |
|
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
This posting is provided "AS IS" with no warranties, and confers no rights.
