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# Device Groups analyze view (Diagnostic and Historical)

Analyze views provide in-depth drill-down on storage system data for various collection ranges.

Attribute | Description
--- | ---
ID | The name that is assigned to the device group
Host IOs/sec | The number of host operations performed each second by the group
Read RT (ms) | The average time that it took the storage system to serve one read I/O for this group
Write RT (ms) | The average time that it took the storage system to serve one write I/O for this group
% Hit | The percent of I/O operations, performed by the group, that were immediately satisfied by cache
% Writes | The percent of I/O operations that were writes
% Read Miss | The percent of read miss operations performed each second by the group. A miss occurs when the requested read data is not found in cache.
Allocated Capacity | The total allocated array capacity
Total Capacity (GB) | The capacity of the device group in GBs
Members | The number of volumes that are in this device group