eG Monitoring
 

Measures reported by VNXeStrPoolsTest

VNXe storage is contained in storage pools. A storage pool is a group of disks of similar type and speed. When storage is allocated for application use, you have the option of choosing the type of storage pool. Depending on the model of the target VNXe storage system and its disk configuration, different storage pools are available for new storage. Storage pools can be created automatically by the system depending on the disk types present, or they can be custom created via a wizard.

Similarly, thin provisioning is the ability to present a server with more capacity than is actually allocated within the storage system. When thin provisioning is enabled for a storage resource, the amount of storage requested is not allocated immediately to the resource. Instead, a small quantity of the storage is allocated by the EMC VNXe to the storage resource. When the amount of storage consumed within the storage resource reaches the limit of the current allocation, the system allocates additional storage to the storage resource from the storage pool. Thin provisioning allows multiple storage resources to subscribe to common storage capacity within a pool, while the system allocates only a portion of the physical capacity requested by each storage resource. VNXe systems allows the storage pools to be oversubscribed.

Without sufficient space, the disks cannot service I/O requests from users. Similarly, if a storage pool is oversubscribed, the users have to wait longer than usual toretreive the data from the disks. This is why, the storage pool assigned to a disk has to be frequently checked for space. The VNXeStrPoolsTest test enables this check. This test monitors the health, subscription and the usage of space in every storage pool and proactively alerts administrators if the storage space in any pool is about to be used up completely! This way, the test prompts administrators to right-size their storage pools, so that users have no issues accessing their disks.

Outputs of the test : One set of results for each Storage Pool in the target storage system being monitored.

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
healthStatus Indicates the current health of this storage pool.   The values reported by this measure and its numeric equivalents are mentioned in the table below:

Measure value Numeric Value
Normal 0
Attention 1
Unknown 2
Degraded/Warning 3
Minor failure 4
Major failure 5
Critical failure 6
Non-recoverable error 7

Note:

By default, this measure reports the Measure Values listed in the table above to indicate the current health of this storage pool. The graph of this measure however is represented using the numeric equivalents only - 0 to 7.

The detailed diagnosis of this measure lists the ID, description, health, threshold, RAID level, Fast cache enabled status of the storage pool.

totalSize Indicates the total capacity of this storage pool. GB  
usedSpace Indicates the amount of space that is currently in use in this storage pool. GB Ideally, the value of this measure should be low.
freeSpace Indicates the amount of space that is available for use in this storage pool. GB Ideally, the value of this measure should be high. Compare the value of this measure across storage pools to identify which storage pool is about to run out of space. You may want to add more space to this storage pool by say, adding more disk volumes to the pool.
sizeUsed Indicates the percentage of space that is currently in use in this storage pool. Percentage  
sizeFree Indicates the percentage of space that is available for use in this storage pool. Percentage  
subscriptions Indicates the percentage of storage that had been requested by the storage resources associated with this storage pool. Percentage A value greater than 100 indicates that the storage pool is over subscribed.
subscriptionpercentage Indicates the current temperature of this storage processor. Celsius Ideally, the temperature of this storage processor should be within permissible range. An abnormally high temperature of may lead to irreversible damage of the storage processor.
numberOfDrives Indicates the number of drives configured for this storage pool. Number