The following table shows passive database copy I/O latency requirements counters. When these values are exceeded, the database copy may lag by not replaying logs to the passive database copy fast enough. Log replication performance may also be affected.
|Counter Name: Database\Database Page Fault Stalls/sec||Description: Indicates the rate of page faults that can't be serviced because there are no pages available for allocation from the database cache.|
|Counter Name: MSExchange Database\I/O Database Reads (Recovery) Average Latency||Description: Indicates the average time, in ms, to read from the database file.|
|Counter Name: MSExchange Database\I/O Database Writes (Recovery) Average Latency||Description: Indicates the average time, in ms, to write to the database file.|