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Changing access nodes online?
Dear All,
I have a Centera (C* 4.1.1) , it contains two cubes. There are 4 access nodes in c001 and two in c002. I want to move all the four acces node roles from c001 to c002. The Centera is a replication source too.
Is it possible to do it online, without any interruption to the archiving applications?
There is one Enterprise Vault 9 (doing file and email archiving) and one CUA 4.1 providing one CIFS share (4888.bin) using this Centera.
What if I unconfigure one access node in c001 and right after configure one in c002 using the same IP? Can the application (Centera API) handle this change?
Thank You!
Regards, Krisztian
EMCDennis
124 Posts
1
August 8th, 2012 13:00
This depends on the connection string used by the applications. If the application is configured to use a single IP address as it’s connection string (not recommended) then by removing the access role for that node, the application will no longer be able to connect to the Centera.
The SDK built within the application does a probe which returns all the IP addresses of all the access nodes and then establishes threads to these.
As such, removing an access node or adding new access nodes should not impact the ability of the SDK to function normally. Established threads on a removed access node will be recreated elsewhere and the transactions retried.
If the connection string contains multiple comma separated IP’s, then you are good to go.
szekelyk
129 Posts
0
August 8th, 2012 13:00
I think the apps connections are configured using hostnames not IP addresses.
Regards, Krisztian
EMCDennis
124 Posts
0
August 8th, 2012 13:00
Same applies. The connection string used by the application will only use the second or subsequent IP addresses (or hostnames) if the first is unreachable.
Regards
Dennis
Phukon
337 Posts
0
August 8th, 2012 20:00
The Node roles should be defined to Access and Replication only from Centera Viewer and I agree with Dennis, the application should failover to the next assigned ip Address, if the first one becomes unreachable.
Regards,
Bashanta Phukon
Satish_Kutty
216 Posts
0
August 15th, 2012 04:00
Hi Krisztian,
Normally there are more than one access nodes in the Cluster. The IP address of all the access nodes would be listed on the pea file used by the API to access the Cluster, so there shouldn’t be any problem accessing the cluster if you are changing one of the nodes online.Please confirm the same before changing the IP address on the nodes.
Regards
Satish.N.Kutty