Multiple MPIO id=37 entries may appear in the System-Event Log if using EMC data replication solutions such as Clariion MirrorView/Cluster Enabler or Recoverpoint/Cluster Enabler. This may be more likely in Win2003/Win2008 failover clusters with secondary/target arrays.
This is the result of normal MPIO function when MPIO-controlled devices are in a not-ready state, because the EMC DSM may use throttle/resume for them.
This is normal if using EMC data replication. If Event Viewer (eventvwr.msc) or other software is used to inspect the System-Event Log, a filter may be used to exclude such entries.
MPIO id=37 entries may be used for events other than throttle/resume. If there is a question of the nature of the events, contact Microsoft support for diagnosis.
MPIO id=37 system-event log
Windows Server 2008 Datacenter, Windows Server 2008 Enterprise, Windows Server 2008 R2 Datacenter, Windows Server 2008 R2 Enterprise, Windows Server 2008 R2 Standard, Microsoft Windows Server 2003, Datacenter Edition (32-bit x86), Microsoft Windows Server 2003, Enterprise Edition (32-bit x86), Microsoft Windows Server 2003, Datacenter x64 Edition, Microsoft Windows Server 2003, Enterprise x64 Edition