Exadata Cell Disks
This page shows IO requests and latency to the disks on the Exadata Storage Servers (cells): Flash Disks and Hard Disks.
The data is sourced from CellCLI where the objectType is CELLDISK.
Note: Spotlight on Oracle RAC may include monitoring of Exadata systems depending on the license purchased.
To open the Cell Disks page
- Select the Spotlight on Oracle RAC connection in the Spotlight Browser.
-
Click Exadata | Cell Disks.
Cell Host
Will the charts / grid on this drilldown page be for all cells, or filtered on one cell? Select as you require.
Charts on the Cell Disks page
Notes:
- These charts only show the top 10 items.
- Every chart has a legend (list of symbols) to its right that describes the various series (line graphs) on the chart.
- Click an item in the legend to highlight its series (line) in the chart. Click a second time to return the series to its normal appearance.
- Move the mouse pointer over an item in the legend to view the current value for that series within the chart.
| Chart | Description |
|---|---|
| Total IO by Cell Disk (Top 20) |
Total I/O requests (read and write for large and small blocks) per Cell Disk. The cell disks with the most active IO (Top 20) are listed. |
| Average Latency by Disk (Top 20) |
The average time delay experienced by reading single blocks per request from a cell disk. The cell disks with the highest average latency (Top 20) are listed. |
IO by Cell Disk Grid
| Column | Description |
|---|---|
| Cell Host | The name of the Exadata Storage Server (Cell) host |
| Cell Disk |
The Exadata Storage Server (Cell) disk.
|
| Latency(ms/request) | The time delay experienced by the disk per I/O request for a single block read. |
| Total Reads/Sec | The rate of I/O read requests (number per second) to the disk. |
| Total Writes/Sec | The rate of I/O write requests (number per second) to the disk. |
| Cumulative Read Latency (seconds) | The cumulative time spent reading from the disk (single block reads). |
| Cumulative Write Latency (seconds) | The cumulative time spent writing to the disk. |
| Mbytes Read/Sec | The rate of I/O read requests (megabytes per second) to the disk. |
| Mbytes Written/Sec | The rate of I/O write requests (megabytes per second) to the disk. |
| Total Read Mbytes | The total number of megabytes read from the disk. |
| Total Write Mbytes | The total number of megabytes written to the disk. |
| Total Read Requests | The total number of read requests to the disk. |
| Total Write Requests | The total number of write requests to the disk. |