Administrator Guide

• Current data throughput (MB/s) for all ports, calculated over the interval since these statistics were last requested or reset.
Capacity information
The Capacity block shows two color-coded bars. The lower bar represents the physical capacity of the system, showing the capacity of
disk groups, spares, and unused disk space, if any. The upper bar identifies how the capacity is allocated and used.
The upper bar shows the reserved, allocated, and unallocated space for the system. Reserved space refers to space that is unavailable for
host use. It consists of RAID parity and the metadata that is needed for internal management of data structures. The terms allocated
space and unallocated space have the following meanings:
For virtual storage:
• Allocated space is the amount of space that the data written to the pools takes.
• Unallocated space is space that is designated for a pool but has not been allocated to a volume within that pool.
• Uncommitted space is the overall space minus the allocated and unallocated space.
For linear storage:
• Allocated space is the space that is designated for all volumes. When a linear volume is created, space equivalent to the volume size is
reserved for it. This is not the case for virtual volumes.
• Unallocated space is the difference between the overall and allocated space.
If virtual storage is overcommitted, which means that the amount of storage capacity that is designated for use by volumes exceeds the
physical capacity of the storage system, then the right upper bar is longer than the lower bar.
Hover the cursor over a segment of a bar to see the storage size of that segment. Point anywhere in this block to see the following
information about capacity utilization in the Capacity Utilization panel:
• Total Disk Capacity: The total physical capacity of the system.
• Unsued: The total unused disk capacity of the system.
• Total Spares: The total spare capacity of the system
• Virtual/Linear Disk Groups: The capacity of disk groups, both total and by pool.
• Reserved: The reserved space for disk groups, both total and by pool.
• Allocated: The allocated space for disk groups, both total and by pool.
• Unallocated: The unallocated space for disk groups, both total and by pool.
• Uncommitted: The uncommitted space in each pool (total space minus the allocated and unallocated space) and total uncommitted
space.
Storage information
The Storage A and Storage B blocks provide more detailed information about the logical storage of the system. The Storage A block
shows information about virtual pool A, which is owned by controller A. For linear storage, it shows most of the same information for all of
the linear pools owned by controller A. The Storage B block shows the same types of information about virtual pool B or the linear pools
owned by controller B. In a single-controller system, only the storage block relevant to that controller will be shown (for example, only the
Storage A block will be shown if controller A is the sole operating controller).
Each storage block contains color-coded graphs for virtual and linear storage.
For virtual storage, the block contains a pool capacity graph, a disk group utilization graph, and—if read cache is configured—a cache
utilization graph. The pool capacity graph consists of two horizontal bars. The top bar represents the allocated and unallocated storage for
the pool with the same information as the capacity top bar graph, but for the pool instead of the system. The bottom horizontal bar
represents the size of the pool.
The disk group utilization graph consists of a graph with vertical measurements. The size of each disk group in the virtual pool is
proportionally represented by a horizontal section of the graph. Vertical shading for each disk group section represents the relative space
allocated in that disk group. A tool tip for each section shows the disk group name, size, and amount of unallocated space. The color for
each disk group represents the tier to which it belongs.
The cache utilization graph also consists of a graph with vertical measurements. However, since read cache does not cache pool capacity,
it is represented independently.
For linear storage, the pool capacity graph consists of a single horizontal bar that shows the overall storage for the pool(s) owned by the
controller. Unlike with virtual storage, there is no bottom horizontal bar. The disk group utilization graph is similar to that shown for virtual
storage. The size of each linear disk group in the storage block is proportionally represented by a horizontal section of the graph. Vertical
shading for each disk group section represents the relative space allocated in that disk group. A tool tip for each section shows the disk
group name, size, and amount of unallocated space. The sections are all the same color since linear disk groups are not tiered.
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