Performance metrics for storage system volumes on block servers

You can include performance data for volumes and caches for storage system volumes on block servers in performance reports.

Volume data

You can create performance reports that include the following information:

Overall Read I/O Rate (ops/s): The average number of read operations per second. This value includes both sequential and nonsequential read operations.
Overall Write I/O Rate (ops/s): The average number of write operations per second. This value includes both sequential and nonsequential write operations.
Total Overall I/O Rate (ops/s): The average number of read operations and write operations per second. This value includes both sequential and nonsequential operations.
Read Data Rate (MiB/s): The average number of MiBs per second that are transferred for read operations.
Write Data Rate (MiB/s): The average number of MiBs per second that are transferred for write operations.
Total Data Rate (MiB/s): The average number of MiB per second that are transferred for read operations and write operations.
Read Response Time (ms/op): The average number of milliseconds to complete a read operation.
Write Response Time (ms/op): The average number of milliseconds to complete a write operation.
Overall Response Time (ms/op): The average number of milliseconds to complete an I/O operation. This value includes both read and write operations.
Read Transfer Size (KiB/op): The average number of KiB that are transferred per read operation.
Write Transfer Size (KiB/op): The average number of KiB that are transferred per write operation.
Overall Transfer Size (KiB/op): The average number of KiB that are transferred per I/O operation. This value includes both read and write operations.
Volume Utilization: The average percentage of time that the volume is busy.

Cache data

You can create performance reports that include the following information:

Overall Read Cache Hit Percentage: The percentage of all read operations that find data in the cache. This value includes both sequential and random read operations, and read operations in the volume cache and volume copy cache where applicable.; You can use this value to understand throughput or response times. Low cache-hit percentages can increase response times because in the event of a cache miss, the data must be read from the back-end storage resources.
Overall Write Cache Hit Percentage: The percentage of all write operations that are handled in the cache. This value includes both sequential and random write operations, and write operations in the volume cache and volume copy cache where applicable.
Total Overall Cache Hit Percentage: The percentage of all read operations and write operations that are handled in the cache. This value includes both sequential and random read and write operations, and read and write operations in the volume cache and volume copy cache where applicable.; You can use this value to understand throughput or response times. Low cache-hit percentages can increase response times because a cache miss requires access to the back-end storage resources.