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Measures reported by FCCluStoragTest
A Cluster Shared Volume is a shared disk containing an NTFS or ReFS (Windows Server 2012 R2 only) volume that is made accessible for read and write operations by all nodes within a Windows Server Failover Cluster.
Virtual machines or applications that run on CSV are no longer bound to storage, and they can share a common disk to reduce the number of LUNs.
Live migration of virtual machines becomes faster because volume ownership does not need to change.
This is why, if a CSV fails, the availability and operations of the VMs using that CSV will be adversely impacted. Likewise, if a CSV has limited or no free space, the dependent VMs will begin to malfunction. This is why, administrators should use the FCCluStoragTest test.
This test auto-discovers the CSVs that have been configured in each cluster, and continuously tracks the state and space usage of each CSV. This way, failed CSVs and the ones that have run out of space can be accurately isolated.
The measures made by this test are as follows:
| Measurement |
Description |
Measurement Unit |
Interpretation |
| State |
Indicates the current status of this CSV. |
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The values that this measure can report the states they indicate have been listed in the table below:
| State |
Measure Value |
| Online |
100 |
| Online pending |
90 |
| Inherited |
80 |
| Initializing |
70 |
| Pending |
60 |
| Offline Pending |
50 |
| Offline |
40 |
Unknown |
20 |
| Failed |
0 |
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| Disk_migrated |
Indicates whether this CSV is migrated or not. |
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The numeric values that correspond to the measure values are discussed in the table below:
| Measure Value |
Numberic Value |
| Yes |
1 |
| No |
0 |
Note:
By default, this measure will report the Measure Values listed in the table above to indicate whether this CSV is migrated or not. In the graph of this measure however, the same is represented using the numeric equivalents only.
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| Total_space |
Indicates the total capacity of this CSV. |
MB |
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| Used_space |
Indicates the amount of space used in this CSV. |
MB |
Ideally, the value of this measure should be low. |
| Free_space |
Indicates the amount of space that is free in this CSV. |
MB |
Ideally, the value of this measure should be high. |
| Percent_usage |
Indicates the percentage of total space in this CSV that is currently in use. |
Percent |
Compare the value of this measure across CSVs to know which CSV is being utilized excessively. A value close to 100% is a cause for concern as it indicates that that CSV is about to run out of space soon. You should then allocate more space to that CSV or clear space in the CSV by removing unnecessary or obsolete data from it. |
| Percent_usage |
Indicates the percentage of total space in this CSV that is currently in use. |
Percent |
Compare the value of this measure across CSVs to know which CSV is being utilized excessively. A value close to 100% is a cause for concern as it indicates that that CSV is about to run out of space soon. You should then allocate more space to that CSV or clear space in the CSV by removing unnecessary or obsolete data from it. |
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