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To support the differing security, backup, performance, and data sharing needs of your users, you group the physical data storage resources on your storage system into one or more aggregates. These aggregates provide storage to the volume or volumes that they contain. Each aggregate has its own RAID configuration, plex structure, and set of assigned disks or array LUNs.

Periodically, you must monitor the I/O activity of each of the aggregates configured on your cluster, so that probable I/O overloads can be rapidly detected from time to time. This test provides these performance insights. This test auto-discovers the aggregates configured on a NetApp Cluster, periodically reports the distribution of I/O load across all aggregates and helps you to identify the aggregate that is overloaded with read-write requests.

Measurement	Description	Measurement Unit	Interpretation
Cpreads	Indicates the rate at which the read requests from the user is serviced during a Consistency Point (CP) operation in this aggregate.	Reads/Sec	A consistent decrease in the value of this measure could indicate that CP operations are slowing down the processing of read requests.
Total_transfers	Indicates the rate at which the transfers are serviced by this aggregate.	Transfers/Sec	Compare the value of this measure across aggregates to identify the busy aggregates.
User_read_blocks	Indicates the rate at which the blocks are read from this aggregate upon a user request.	Blocks/Sec	A consistent decrease in the value of this measure could indicate a bottleneck when processing read requests. Compare the value of this measure across aggregates to know which aggregates service block read requests slowly.
User_reads	Indicates the rate at which the read request from the user is serviced by this aggregate.	Reads/Sec	A consistent decrease in the value of this measure could indicate a bottleneck when processing read requests. Compare the value of this measure across aggregates to know which aggregates service read requests slowly.
User_write_blocks	Indicates the rate at which the blocks are written to this aggregate upon a user request.	Blocks/Sec	A consistent decrease in the value of this measure could indicate a bottleneck when processing write requests. Compare the value of this measure across aggregates to know which aggregates are servicing block write requests slowly.
User_writes	Indicates the rate at which the write request from the user is serviced in this aggregate.	Writes/Sec	A consistent decrease in the value of this measure could indicate a bottleneck when processing write requests. Compare the value of this measure across aggregates to know which aggregates are servicing write requests slowly.