Engineered Platform Storage Systems - Policy on monitoring free memory in cell servers.
Last updated on JUNE 04, 2013
Applies to:Oracle Exadata Storage Server Software - Version 188.8.131.52.0 and later
Cell servers running on linux operating systems can use all memory via the Cellsrv software running on the cell nodes. This can utilize most of the memory and there should not be any monitoring
thresholds set by customers to address low memory issues . In addition, restart server (RS) on the cells detects low swap space and restarts cellsrv. This will cause an alert which can be reported to Oracle support. We do not expect such an alert to be generated as cellsrv has preemptive checks to prevent over-utilization of memory. However, should such an alert occur, then it should be reported to Oracle support.
Other than this, we do not recommend any other alerts to be set for memory thresholds on the cell. So, this setting of alerts for 85% memory threshold by the customer for cell memory is not correct and not recommended.
High cell server memory utilization can be seen on cell servers (all nodes or some nodes) for any of the combinations X2-2 / X2-8 (Quarter , Half, Full, with / without expansion RACKs)
Memory monitoring on cell server for free memory availability, alerts on the EM 12c console.
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