Data Backup and Recovery

using commands to create shared luns for MSCS

netappmagic

Please verify following steps in create shared luns in a 2-nodes cluster environment, ignored some of details in options.

-     igroup create igroup_node1 wwn_node1

-     igroup create igroup_node2 wwn_node2

-    vol create

-     lun create shared_lun1

-     lun map shared_lun1 igroup_node1

-     lun map shared_lun1 igroup_node2

If I want to create 2nd shared lun then add the following:
-     lun creaet shared_lun2

-     lun map shared_lun2 igroup_node1     # map to the same igroup

-     lun map shared_lun2 igroup_node2

then on two nodes, disk scan to discover the new created shanred lun.

Are above steps seem correct?

Thnaks!

6 REPLIES 6

arunchak

Yes they use separate initiators for SDW. Also if you want to map the same LUN on one node using iSCSI and other using FCP, then you would need separate igroups as above.

aborzenkov

I prefer to use single initiator group for all nodes in cluster, that ensure that every LUN is always mapped to all nodes. But your way will work as wll, and is actually used by SnapDrive.

netappmagic

Got your point.

A follow-up questions: Will you create a igroup for each one of shared LUN's and mapped to all nodes, or create a single igroup for all lun's and mapped to all nodes?

aborzenkov

Single group for all LUNs and all nodes in a cluster.

netappmagic

Thanks for your time and patience.

One more question:

What benifits I am getting by creating a single igroup for them all, instead of the way I initially wrote?

aborzenkov

It ensures that any change in configuration is always applied to the whole cluster. When you add LUN, it is ensured that all nodes see it. When you a node, it is ensured it sees all LUNs.

Whether this is beneficial or not, it is up to you after all ...

Announcements
NetApp on Discord Image

We're on Discord, are you?

Live Chat, Watch Parties, and More!

Explore Banner

Meet Explore, NetApp’s digital sales platform

Engage digitally throughout the sales process, from product discovery to configuration, and handle all your post-purchase needs.

NetApp Insights to Action
I2A Banner
Public