Which three statements are true concerning node evictions and reboots performed by Oracle Clusterware 12c?
A.
All node evictions require that the evicted node or nodes be rebooted.
B.
A node whose performance is severely degraded can be evicted.
C.
The OCSSD process may evict a node after an escalation request from a database instance LMON process.
D.
The CSSDMONITOR process can request a node eviction.
E.
The OCLSKD process is used for node eviction requests originating on the node to be evicted.
F.
The reboot advisory broadcasts reboot decisions only over the interconnect.
Explanation:
D: The cssdagent and cssdmonitor provide the following services to guarantee data integrity:
Monitors the CSS daemon; if the CSS daemon stops, then it shuts down the node
Monitors the node scheduling to verify that the node is not hung, and shuts down the node on recovery from a hang.
Note If the Oracle Clusterware itself is working perfectly but one of the RAC instances is hanging , the database LMON process will request a member kill
escalation and ask the CSS process to remove the hanging database instance from the cluster.
On a Linux/Unix system CSS consists of ocssd.bin, cssdmonitor, and cssdagent.
E: Cluster kill daemon (oclskd) handles instance/node evictions requests that have been escalated to the Cluster Synchronization Service (CSS).
Incorrect Answers:
C: Ocssd manages cluster node membership and runs as the oracle user; failure of this process results in a node restart.
I think B,D,E but what about C I think C correct also
Failure to correctly configure the network interface cards and switches used for the
interconnect results in severe performance degradation and possible node evictions or node fencing.
The ocssd process can also evict a node after escalation of a member kill from a client (such as a database LMON process). This is a multithreaded process that runs at an elevated priority and runs as the Oracle user.
The following processes can evict nodes from the cluster
or cause a node reboot:
– oclskd: Is used by CSS to reboot a node based on
requests from other nodes in the cluster
– cssdagent and cssdmonitor: Monitor node hangs and
vendor clusterware
– ocssd: Internode health monitoring
BDE is correct,
Not A
. Node that are evicted from the cluster do not requirea restart; they need only a cluster software
restart. (Flex cluster)
B
. Oracle Clusterware is designed to performa node eviction by removing one or more nodes from the cluster if some
critical problem is detedted. A critical problem could be …severely degraded machine….
C
. The ocssd process can also evict a node after escalation of a member kill from a client (such as a database LMON
process).
D
. The cssdmonitor daemon monitors the ocssd daemon for hangs or scheduling issues and can reboot a node if there is a perceived hang.
Not E
. oclskd is used by CSS to reboot a node based on request from other nodes in the cluster
NOt F
. The reboot decision is broadcase over all available network interfaces…
BCD