Which two are true concerning the allocation of I/O resources by the IORM within the CELLSRV process?
Correct Answer: C,D
Explanation/Reference:
*(not A, Not B) Rules in an interdatabase resource plan specify allocations to databases, not consumer groups.
* IORM Rules
IORM is only "engaged" when needed.
/(D) Redo and control file writes always take precedence.
/(Not E) DBWR (database writer) writes are scheduled at the same priority as user IO.
/IORM does not intervene if there is only one active consumer group on one database.
/Any disk allocation that is not fully utilized is made available to other workloads in relation to the configured resource plans.
/Background IO is scheduled based on their priority relative to user IO.
/For each cell disk, each database accessing the cell has one IO queue per consumer group and three background queues
Note:
* Use IORM metrics to track
/I/O load per Consumer Group (IOPS, MBPS, disk utilization %)
/I/O throttling per Consumer Group
Reference: Using IORM with Exadata