eG Monitoring
 

Measures reported by ClariionRaidTest

Sufficient disk space should be available in a RAID group, as new LUNs cannot be created in a RAID group that suffers from a severe space contention. Also, with many critical applications attached to RAID groups, it is essential for administrators to track the capacity and usage of each RAID group on the storage system to figure out whether enough disk space is available in all RAIDs to support the storage requirements of these applications.

This test auto-discovers the RAID groups on the storage system, and reports the current state, capacity, space usage, and space availability of each RAID group so that, you can instantly identify the RAID groups that are running out of space.

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
Raid_group_state This measure indicates the current state of this RAID group.   This measure reports any of the following values as the state of the RAID group:
  • Invalid
  • Valid
  • Defragmenting
  • Valid LUNs
  • Expanding
  • Busy
  • Explicit Remove
  • Other
The numeric values that correspond to each of the states discussed above are as follows:

Numeric Value State
0 Invalid
1 Valid
2 Defragmenting
3 Valid LUNs
4 Expanding
5 Busy
6 Explicit Remove
7 Other

Note:

By default, this measure reports the States listed in the table above to indicate the state of a RAID group. The graph of this measure however, represents RAID group state using the numeric equivalents - 0 to 7.
Disk_count This measure indicates the number of disks assigned to this RAID group. Number To know which disks have been assigned to a RAID group, use the detailed diagnosis of this measure.
Lun_count This measure indicates the number of LUNs sharing this RAID group. Number To know which LUNs are sharing a particular RAID group, use the detailed diagnosis of this measure.
Raw_capacity This measure indicates the amount of raw capacity (in millions of blocks) of this RAID group that is available for binding LUNs. TB  
Logical_capacity This measure indicates the logical capacity of this RAID group. MB  
Free_capacity This measure indicates the amount of unused capacity in this RAID group. GB A high value is generally desired for this measure. A very low value or a consistent dip in this value could indicate a space crunch in the RAID group, which in turn can prevent the creation of new LUNs in the group.
Free This measure indicates the percentage of free space in this RAID group. Percent A high value is generally desired for this measure. A very low value or a consistent dip in this value could indicate a space crunch in the RAID group, which in turn can prevent the creation of new LUNs in the group.
Defragmented This measure indicates the progress (in percentage) of the defragmentation process on this RAID group. Percent As you unbind and rebind LUNs on a RAID Group, gaps may be created in the contiguous space across the Group's disks, fragmenting the RAID Group. Fragmentation makes less space available for creating new LUNs. Defragment a RAID Group to compress these gaps and provide more contiguous free space across the disks. Using this measure, you can easily track the progress of the defragmentation activity on each RAID group, and can receive a fair idea as to how long it would take for the defragmentation to complete.
Expanded This measure indicates the progress (in percentage) of a RAID group expansion performed on this RAID group. Percent You can expand an existing RAID group by adding more disks to it. Expansion makes have more space available in the raid group to create new LUNs.

Using this measure, you can easily track the progress of the expansion of each RAID group, and can receive a fair idea as to how long it would take for the expansion to complete.
Max_disk This measure indicates the maximum number of disks that this RAID group can contain. Number  
Max_lun This measure indicates the maximum number of LUNs that can be created in this RAID group. Number  
Free_contiguous This measure indicates the size of the largest contiguous span of free space in this RAID group. GB The larger this space, higher will be the number of LUNs that can be created on the corresponding RAID group.
Defrag_expand_priority This measure indicates the current expansion / defragmentation priority of this RAID group.   This measure can report one of the following values:

  • High
  • Medium
  • Low

The higher the priority, the more system resources that are used, which can reduce system performance.

The numeric values that correspond to each of the priorities discussed above are as follows:

Numeric Value Priority
0 Low
1 Medium
2 High

Note:

By default, this measure reports the Priorities listed in the table above to indicate the defrag/expansion priority of a RAID group. The graph of this measure however, represents priorities using the numeric equivalents - 0 to 2.
Disk_expanding This measure indicates whether any disk in this RAID group is currently expanding or not.   If no disks in the RAID group are expanding currently, then this measure will report the value N/A. If one or more disks are currently expanding, then this measure will report the value Available.

The numeric values that correspond to each of the expansion states discussed above are as follows:

Numeric Value State
0 N/A
1 Available

Note:

By default, this measure reports the States listed in the table above to indicate the expansion state of a RAID group. The graph of this measure however, represents expansion states using the numeric equivalents - 0 and 1.
Lun_expansion This measure indicates whether LUN expansion is enabled or disabled for this RAID group.   If LUN expansion is enabled for a RAID group, then this measure will report the value Enabled. If not, then the value would be Disabled.

The numeric values that correspond to each of the expansion states discussed above are as follows:

Numeric Value State
0 Disabled
1 Enabled

Note:

By default, this measure reports the States listed in the table above to indicate the LUN expansion state of a RAID group. The graph of this measure however, represents expansion states using the numeric equivalents - 0 and 1.