procedure and aprox estimated down time regarding single node cluster/two node cluster

Did you look at following link for adding a node to VCS cluster?

https://sort.symantec.com/public/documents/vcs/6.0/solaris/productguides/html/vcs_install/ch33.htm

To use the above link, You should have install node-A using following information. 

https://sort.symantec.com/public/documents/vcs/6.0/solaris/productguides/html/vcs_install/apes02s01.htm

https://sort.symantec.com/public/documents/vcs/6.0/solaris/productguides/html/vcs_install/apes02s02.htm

The node-B is also set-up using the same instructions, except that you may not start VCS on node-B. 

Beyond that you will use the information given in first link above.

 

 

and following for removing a node:

https://sort.symantec.com/public/documents/vcs/6.0/solaris/productguides/html/vcs_install/ch33s05.htm

 

https://sort.symantec.com/public/documents/vcs/6.0/solaris/productguides/html/vcs_install/ch33s02.htm

As per the above steps , can we run the below command on a single node cluster ?

# cd /opt/VRTS/install

# ./installvcs -addnode

 

the above assumes that you have a single-node cluster running configured as "single node cluster to join a larger cluster". 

if you have configured single-node cluster "to be a stand-alone single node cluster", then you will have to follow the instructions given at  following link. 

(pasting 6.0 solaris link instead of 5.1sp1 link provided in first post)

https://sort.symantec.com/public/documents/vcs/6.0/solaris/productguides/html/vcs_install/ch32.htm

this may have the downtime. 

 

The suggestion i gave are assuming that you going to install fresh VCS 6.0 node and hence you have option to install single-node cluster to join a larger cluster. 

i hope the difference between the following two is understood - 

https://sort.symantec.com/public/documents/vcs/6.0/solaris/productguides/html/vcs_install/apes02s01.htm

[snip]

 

You can use the installer program to install a cluster on a single system for either of the two following purposes:

• To prepare the single node cluster to join a larger cluster

• To prepare the single node cluster to be a stand-alone single node cluster

[/snip]

 

I think customer is in first situation.

 

First thanks arangari for your kind replies.

Got it. What I asume is below:

To prepare the single node cluster to join a larger cluster

The above term means suppose there is a two/three or more node cluster configured and service group are online on it .. and we install vcs on a new machine and add this new machine to a two/three or more node cluster.

To prepare the single node cluster to be a stand-alone single node cluster

The above term means we installed vcs on a single machine and configured this machine as a single node cluster and service group is online on it... (In this phase if I want to make this single node cluster to a two nodes cluster then we must need down time as per the below document)

https://sort.symantec.com/public/documents/vcs/6.0/solaris/productguides/html/vcs_install/ch32.htm

=====================================

 

 

 

Zahid,

your understanding is correct. however the larger cluster could also have just a single node to start with. 

also the groups should be present on original cluster and the new node should get added into the SystemList of the SGs after new node joins.

You made my both point same amit :( .. but still I am very thankful of yours to repling on my queries.

Let me make very simple and to the point:

( Right now there is no cluster implemented just planning on the behalf of SYMANTEC CONNECT comments which I always feel very informative )

 

a,.) In a single node cluster can we join/add a new node to make this single node cluster in to two node cluster without any down time ?

b.) In a two node cluster (whose HB are connected back to back and no switch is installed in between two node cluster so we cant add a third node).... can we remove passive node(who hardware is actually old) and add a new node( whose hardware is as same as active node which we get after few weeks ) in place of passive node without any down time ?

Zahid:

 

a:  Yes. There is no downtime needed for node to be joined. There may be a down-time for joining node. If the new node is fresh, then i do not see any issue there either. This is all assuming that you have made sure that node to be joined was created for joining into larger cluster. Essentially, it is already using LLT and GAB, and hence extending should be no issue.

 

b. lets call HB as LLT links. If the LLT links are connected without any switch,  back-to-back between two nodes, then one can shut-down the node to be replaced. This will make sure that (based on configuration), the service groups running will be evacuated to the other node.  once the LLT links are connected, one can run 'installvcs -addnode'.  Please note that the original node name may still be present in /etc/llthosts and in VCS configuration, which need to be removed by editing the file, and deleteing system (hasys -delete). 

Let me know if you get into any issues here. 

 

 

point a

- There may be a down-time for joining node. If the new node is fresh,

Could nt understand what are you saying

- I means that single node cluster means there is a cluster which has only one node. Then how you assume that LLT and GAB is running in a cluster which has only one node. ( Can I install a single node cluster with LLT and GAB ?) Essentially, it is already using LLT and GAB, and hence extending should be no issue.

Yes- you could start cluster with one node with GAB and LLT. Just try following: Set llttab normally Set llthosts with only one node Gabtab will have 'gabconfig -c -n1' Start VCS without -onenode

Zahid, i will attempt responding to you by monday - with proper illustrations. :)