topic Re: address for san switch, presentation to a clusters system in HPE EVA Storage

address for san switch, presentation to a clusters system

WilliamSmith11 — Mon, 26 Jul 2004 08:24:10 GMT

Hi I have some question about SAN.

If I am going to install a cluster system running Open Vms , and I install two FCA per each system,
1-is necesary to set some ID to the fiber channel adapter such was necessary in the SCSI configurarion when where installed two kzpsa on each system?

When I am going to present a virtual disk to the cluster system

2-Only I have to select the host folder where I have assigned the four fiber channel adapters WWID?

I know that is important to take care about the unit_ID for OpenVms that must be unique in the system,

3-Is ok the way as I think to present the virtual disk to the cluster?

Re: address for san switch, presentation to a clusters system

Uwe Zessin — Mon, 26 Jul 2004 08:41:01 GMT

Richard,

1: no, the fibre channel address is assigned by the switch. Just turn on fabric protocol:
>>> wwidmgr -set adapter -item 9999 -topo fabric

2: I am not sure if I understand your question correctly. When you are in the virtual disk dialogue for presentations you choose a HOST, not a HOST FOLDER. It sounds like you have created a HOST object and assigned it all 4 fibre channel adapter WWNs from both servers.

Make sure you have assigned the correct operating system type, here.

3: The OS Unit ID is a characteristic of the virtual disk, not the individual mapping of a virtual disk to a single host. The OS Unit ID defines the unit number of the fibre channel disk - e.g. ID=5 gives device "$1$DGA5:". These IDs must be unique within the whole cluster.

Re: address for san switch, presentation to a clusters system

WilliamSmith11 — Mon, 26 Jul 2004 13:52:05 GMT

Uwe
I think that have done my second question in wrong manner.

I have HOST FOLDERS
In this host folder there are HOSTS
Host1 and Host2
Host1 and Host2 have 2 FCA each one

If I have a virtual disk with ID=5

and this disk is going to be part of this cluster,

1-There is not problem when presenting this virtual disk to both hosts.

How do cluster system knows that only one node have permission to write to the presented disk eg $1$DGA5

both system are able to see this virtual disk, the system is a cluster right now , we are adding a virtual array at this moments.

thank you

Re: address for san switch, presentation to a clusters system

Uwe Zessin — Tue, 27 Jul 2004 00:10:03 GMT

Huh? If this is an OpenVMS cluster, then ALL cluster members are allowed to mount the disks and write to them! OpenVMS uses its built-in distributed lock manager to synchronize access to the disks - this is not a failover system like MSCS.