Detailed LUN Statistics Descriptions

Detailed statistics for each LUN is available from the LUNs page.

The following statistical data is refreshed every two minutes.
Name

Identifies the name of the selected LUN.

Oracle FS System Performance

Specifies throughput and IOPS data divided by the CPU cycles needed to process those I/O requests from the LUN. The difference between Oracle FS System Performance and System Load is thatOracle FS System Performance includes the CPU cycles needed to perform read operations or write operations.
Read Throughput

Indicates the data transfer rate for read operations.

Write Throughput

Indicates the data transfer rate for write operations.

Total Throughput

Indicates the data transfer rate for read operations and write operations.

Read IOPS

Indicates the average number of read operations per second.

Write IOPS

Indicates the average number of write operations per second.

Total IOPS

Indicates the total read and writes operations per second.

System Load

Specifies throughput and IOPS data if the system devoted all resources to process those I/O requests from the LUN. The difference between System Load and Oracle FS System Performance is that the System Load does not include the CPU cycles needed to perform read operations or write operations.

Read Throughput

Indicates what the data transfer rate for data inputs, which are read operations, of the specified LUN would be if the system devoted all of the CPU resources to the LUN.

Write Throughput

Indicates the data transfer rate for data outputs, which are write operations, of the specified LUN would be if the system devoted all of the CPU resources to the LUN.

Total Throughput

Indicates the average data transfer rate for data read operations and write operations of the specified LUN would be if the system devoted all of the CPU resources to the LUN.

Read IOPS

Indicates the average number of read operations per second for read operations would be if the system devoted all of the CPU resources to the LUN.

Write IOPS

Indicates the average number of write operations per second for write operations would be if the system devoted all of the CPU resources to the LUN.

Total IOPS

Indicates the combined read and write operations per second would be if the system devoted all of the CPU resources to the LUN.

I/O Latency

Specifies the average time to complete a read or write operation (in milliseconds) and the average operation size (in KB).

Read Response Time

Identifies the average time to perform a read operation in the last sample period.

Write Response Time

Identifies the average time to perform a write operation in the last sample period.

Response Time

Identifies the average time to perform a read or write operation in the last sample period.

Read Operation Size

Identifies the average size of a read operation in the last sample period.

Write Operation Size

Identifies the average size of a write operation in the last sample period.

General

Specifies the I/O activity of the cache usage.

Cache Flushes per Second

Indicates the rate per second for which cache lines were flushed (written) to disk in the last sample period.

Cache Hit Ratio

Indicates the percentage of read operations that were completed from the read cache, which is also called cache hits, in the last sample period.

Read-Ahead IOPS

Indicates the average read operations per second from read-ahead fetching in the last sample period.  Read-ahead fetching utilizes read access behavior in the sample period to determine read-ahead IOPS.

Non-Optimized IOPS

Indicates the total read operations and write operations per second that passed through non-optimized data paths in the last sample period. Optimized paths are preferred over  non-optimized paths for performance. Non-optimized paths occur when there is no path management software used to manage data paths, the path management software is not configured correctly, or an optimized path is not available.

Path management software and applications provide load balancing and path management for improved performance