we have to four mailbox servers, two in primary site, two in dr site. it happens an unplaned failover issue, all of database are actived on mailbox server1, but some hours later, these database are unplaned to active on another mailbox server2, it also happens in mailbox server2. that's why? after check eventlog, I found below:
AppLogEventID: 3169
AppLogEventMessage:
(Active Manager) Database MDB00 was successfully moved from shmbx01.ebaotech.com to SHMBX02.ebaotech.com. Move comment: Managed availability system failover initiated by Responder=OutlookRpcDeepTestFailover Component=Outlook.
also check server health, found OutlookRpcDeepTestMonitor is degraded, OutlookRpcSelfTestMonitor is unhealty
Server State Name
TargetResource HealthSetName AlertValue ServerComponent
------ ----- ----
-------------- ------------- ---------- ---------------
shmbx01 NotApplicable OutlookRpcSelfTestMonitor
Outlook.Protocol Unhealthy None
shmbx01 NotApplicable OutlookRpcDeepTestMonitor
Outlook.Protocol Degraded None
shmbx01 NotApplicable PrivateWorkingSetWarningThresholdExceeded.m.e.rpcclientaccess.service microsoft.exchange.rpcclientaccess.service Outlook.Protocol Healthy None
shmbx01 NotApplicable ProcessProcessorTimeErrorThresholdExceeded.m.e.rpcclientaccess.service microsoft.exchange.rpcclientaccess.service Outlook.Protocol Healthy None
shmbx01 NotApplicable ExchangeCrashEventErrorThresholdExceeded.m.e.rpcclientaccess.service microsoft.exchange.rpcclientaccess.service Outlook.Protocol Healthy None
shmbx01 NotApplicable OutlookMapiHttpSelfTestMonitor
Outlook.Protocol Healthy None
shmbx01 NotApplicable OutlookMapiHttpDeepTestMonitor
Outlook.Protocol Healthy None
I don't know what causes this issue, and how can I resovle it to prevent the database unplaned failover, please help to look into it. thanks.