2.1.9 Exascale Direct Volume Observability

Oracle Exadata System Software release 26.1.0 introduces the Exascale Direct Volume Statistics utility (edvstat), which provides real-time statistics about Exascale Direct Volume (EDV).

The edvstat utility improves observability on EDV client systems and enables administrators to understand:

• How much read and write I/O is being performed on each EDV attachment.

• How read and write I/O is being serviced through disk, flash cache, XRMEM cache, and remote direct memory access (RDMA).

• How read and write I/O further breaks down into various categories, including:

  • Large and small I/O.

  • Total number of I/O operations.

  • Total amount of I/O performed.

  • Number of I/O operations each second.

  • Amount of I/O performed each second.

The edvstat utility is conceptually similar to the Linux iostat utility, providing periodic snapshots of I/O performance for each storage and cache device. Storage administrators can run edvstat on demand to view real-time I/O performance and use flexible filtering to identify top-consuming volumes and volume groups. The output can use an iostat-like format or JSON format. ExaWatcher also includes edvstat output in its log files.

Use this feature for faster root-cause analysis of EDV performance issues, including cache hit rates, RDMA read throughput, queue times, and average transfer rates.