11 GR 2 RAC - on SCAN with DNS

Hi guys,.

Just finished 2-node RAC with Oracle VM Virtualbox Setup to test the object.

I was not a DNS use so, basically, I do the file/etc/hosts as a workaround.

# SCAN

192.168.56.91 myrac - scan.localdomain myrac-scan

192.168.56.92 myrac - scan.localdomain myrac-scan

192.168.56.93 myrac - scan.localdomain myrac-scan

A certain documents actually mentioned that if we use the hosts file to resolve the name SCAN, we can have only one address IP SCAN

I don't really understand what that means. In my setup, I did 3 IPs, and I see no problem with that.

In my customer tnsnames.ora, I actually use below. Either specify it as 91, 92 or 93, it will happen to load balancing. (or connect to rac1 or rac2)

RACDB =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP) (HOST = 192.168.56.91)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = myracpoc.localdomain)
)
)

The below also shows, I have 3 fps. As I am quite new to the CARS, I'm trying to understand why the documents mentioned that we should have an ip in/etc/hosts instead of 3.

Enjoy your advice!

[oracle@myrac1 ~] $
Scan of $GRID_HOME/bin/srvctl config

SCAN name: myrac - scan.localdomain,.
Network: 1/192.168.56.0/255.255.255.0/eth0

SCAN VIP name: scan1, IP:
/myrac-scan.localdomain/192.168.56.91

SCAN VIP name: scan2, IP:
/myrac-scan.localdomain/192.168.56.92

SCAN VIP name: scan3, IP:
/myrac-scan.localdomain/192.168.56.93

Just curious. But think about it, if scan main objective is to simplify the configuration of the client tnsnames file (in this case if additional nodes increase or remove), is not to have a scan in/etc/hosts to achieve this? Just add the below in all clients.

However, I agree that he will lose the SCAN (IP) load balancing and if the individual scan listener down, the whole cluster is not achievable.

I probably rephrased it wrong in my previous responses, but simplifying the client configuration is only one of the objectives. Having the ability to load balance through DNS connections would be another of his goals. You have answered your question in your second sentence :). In the case of having 1 SCAN IP in/etc/hosts, in your cas.91, if this SCAN listener becomes congested or unavailable, all clients configured to use this IP SCAN will not be able to join the cluster.

Tags: Database

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