eG Monitoring
 

Measures reported by RHEVMStorageTest

A data center relies on adequate and accessible physical storage. The storage pool is a logical entity that contains a standalone image repository of a certain type, either iSCSI ,or Fiber Channel, or NFS. Each Storage Pool may contain several storage domains, for Guests images, for ISO images and for Import/Export images. If a storage domain becomes unavailable or runs out of space, then this will affect the operations of the VMs using that storage domain. To promptly detect the unavailability or abnormal usage of a storage domain and isolate the VMs that may be impacted by this, use the Storage Domains test.

If a storage domain becomes unavailable or runs out of space, then this will affect the operations of the VMs using that storage domain. To promptly detect the unavailability or abnormal usage of a storage domain and isolate the VMs that may be impacted by this, use the Storage Domains test.

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
Num_vms Indicates the number of VMs that are currently using this storage domain. Number To know which VMs are currently using the storage domain, use the detailed diagnosis of this measure.
Master Indicates whether/not this storage domain is the master storage domain in this data center. Number This measure will report the value Yes if the storage domain is the master, and No if it is the slave.

The numeric values that correspond to the Yes/No values above are as follows:

Numeric Value Measure Value
1 Yes
0 No

Note:

By default, this measure reports one of the Measure Values listed in the table above. The graph of this measure however will represent the storage domain type (master/slave) using the numeric equivalents - ‘0’ or ‘1’.
Tot_space Indicates the current capacity of this storage domain. GB  
Free_space Indicates the amount of storage space that is currently available for use in this storage domain. GB A high value is desired for this measure.
Used_space Indicates the amount of storage space currently utilized by this domain. GB Ideally, the value of this measure should be low.
Commit_space Indicates the amount of storage space currently committed in this storage domain. GB  
Pct_usage Indicates the percentage of total storage space in this storage domain that is currently being utilized. % Compare the value of this measure across domains to identify the domain that is experiencing a space drain.

A high value or a consistent increase in this value is a cause for concern, as it indicates the steady erosion of storage space from a storage domain. If a storage domain runs out of space, it will affect the operations of all VMs that use that domain.

Availability Indicates whether/not this storage domain is currently available in the datacenter. % While the value 0 indicates that the storage domain is unavailable, the value 100 indicates that the storage domain is currently available.

If a storage domain used by a VM is rendered unavailable, users will be denied access to that VM.

Vdisk_space Indicates the virtual disk space allocated to all the VMs that are currently using this storage domain. GB Use the detailed diagnosis of this measure to know which VM has been allocated how much virtual disk space.