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# BE Directors (DA) analyze view (Diagnostic and Historical)

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

Table 1. BE Directors (DA) analyze view (Diagnostic and Historical)
Attribute | Description
--- | ---
Name | The ID of each back-end director
% Busy | The percentage of time that a director is busy
IOs/sec | The number of I/O operations per second commands to the disk
Reqs/sec | The number of data transfers that occur between the director and the cache. An I/O may require multiple requests depending on I/O size, alignment or both. For writes the request counter is incremented at the time that the write pending flag is removed from the cache slot. If multiple DAs are involved in the I/O operation (such as RAID 1), the request count may not reconcile with the I/O count and I/O size.
MBs Read/sec | The average size of host MBs read (per second) by the director
MBs Written/sec | The average size of host MBs written (per second) by the director

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