SMI-S Block Server Performance Subprofile

This profile provides I/O statistics for various CIM_StorageExtent subclasses.

OpenLMI-Storage implements the Block Server Performance Subprofile with these adjustments:

• Applications cannot create custom manifests, i.e. LMI_BlockStatisticsService.AddOrModifyManifest is not implemented.
• We provide LMI_BlockStorageStatisticalData for every CIM_StorageExtent subclass and not only for disk drives. LMI_BlockStorageStatisticalData.ElementType property is always set to 9, i.e. Extent.
• There is no sampling interval. OpenLMI always reports current values when returning LMI_BlockStorageStatisticalData instance.

Note

Even though properties in LMI_BlockStorageStatisticalData are 64-bit, they are tracked as 32-bit on systems with 32-bit kernel. They can wrap pretty quickly on modern hardware.

For example, on i686 with iSCSI drive on 10Gb/s link, the KBytesRead counter can wrap in approximately 27 minutes.

With 64-bit kernels, these counters are tracked in 64-bits and they wrap once in a few years.

Implementation

All mandatory classes and methods are implemented.

Classes

Implemented SMI-S classes:

• LMI_BlockStorageStatisticalData
• LMI_StorageElementStatisticalData
• LMI_StorageStatisticsCollection
• LMI_MemberOfStorageStatisticsCollection
• LMI_HostedStorageStatisticsCollection
• LMI_BlockStatisticsService
• LMI_BlockStatisticsCapabilities
• LMI_BlockStatisticsManifest
• LMI_BlockStatisticsManifestCollection
• LMI_MemberOfBlockStatisticsManifestCollection
• LMI_AssociatedBlockStatisticsManifestCollection

Methods

Implemented methods:

• LMI_BlockStatisticsService.GetStatisticsCollection