| Measures reported by VnxFileSpaceTest
Data movers in EMC VNX are containers for file systems. These data movers provide remote users with access to the file systems using CIFS, NFS, MPFS, and pNFS protocols. Upon receipt of an I/O request, a data mover reads from or writes into the meta volume where the file system being accessed is stored. In the process, storage space in the meta volume is used. If a file system runs out of storage space, no further reads/writes can be performed on that file system. It is hence imperative that space utilization by a file system is continuously monitored. For this purpose, you can use the VnxFileSpaceTest test.
For every file system residing in each data mover in a DME, this test reports the total storage capacity of the file system and how this capacity is utilized. In the process, the test proactively alerts administrators to a potential space-crunch, accurately points them to the exact file system that is running out of storage space, and also leads them to the correct location of the file system - i.e., it indicates which data mover contains that file system. This way, the test ensures that the file system is adequately sized and is continuously available for reading and writing.
The measures made by this test are as follows:
| Measurement |
Description |
Measurement
Unit |
Interpretation |
| Total_size |
Indicates the total storage capacity of the file system. |
MB |
|
| Used_size |
Indicates the amount of space that is currently used by this file system. |
MB |
Ideally, the value of this measure should be low. |
| Available_size |
Indicates the amount of space that is currently available for use in this file system. |
MB |
Ideally, the value of this measure should be high. |
| Percentage_size_used |
Indicates the percentage of space that is already utilized in this file system. |
Percent |
Ideally, the value of this measure should be low. ACompare the value of this measure across file systems to identify that file system which is utilizing too much space and may hence experience a space contention shortly. If that file system appears to run short of space frequently, you may want to consider allocating more storage space to that file system. |
| Percentage_available |
Indicates the percentage of space that is currently unused in this file system. |
Percent |
Ideally, the value of this measure should be high. Compare the value of this measure across file systems to identify that file system which has very limited free space and may hence experience a space contention shortly. If that file system appears to run short of space frequently, you may want to consider allocating more storage space to that file system. |
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