Originally posted by: SystemAdmin

Hi,

need advice on this.

Is it possible to assign a mountpoint from a SAN storage to server1 & server2.
Use NFS to the same mountpoint from server2 so that concurrent access is allowed.
Can this setup be used together with HACMP?
If server1 crash, the mountpoint resource will swing to server2, will it automatically remove the NFS and server2 take over the mountpoint resource and become active.

Simpler approach is to use PFSS?

Any ideas?

Regards
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Originally posted by: grukrz1

I am not sure I get right your question but NFS in HACMP are possible.

For example, you have two resource groups in the 2 node cluster: RG1 and RG2 with following startup/fallover/fallback policies:
Resource Group Name RG1
Participating Node Name(s) CLNODE1 CLNODE2
Startup Policy Online On Home Node Only
Fallover Policy Fallover To Next Priority Node In The List
Fallback Policy Fallback To Higher Priority Node In The List

Resource Group Name RG2
Participating Node Name(s) CLNODE2 CLNODE1
Startup Policy Online On Home Node Only
Fallover Policy Fallover To Next Priority Node In The List
Fallback Policy Fallback To Higher Priority Node In The List

You have shared VG built on shared SAN disks (configured on both cluster nodes)

In RG1 (lets call it primary or parent RG) you configure shared VG and NFS:
Filesystems/Directories to be exported /fs_on_shared_VG Filesystems to be NFS mounted /fs_on_shared_VG_NFS;/fs_on_shared_VG
Volume Groups sharedvg

Having above, when the cluster is started:

on CLNODE1:

• RG1 is brought ONLINE
• sharevg is "active" and shared fs are mounted
• NFS filesystem CLNODE1:/fs_on_shared_VG is mounted to mountpoint /fs_on_shared_VG_NFS

on CLNODE2:

• RG2 is brought ONLINE
• NFS filesystem CLNODE1:/fs_on_shared_VG is mounted to mountpoint /fs_on_shared_VG_NFS

When you takeover RG1 to RG2 you will have on CLNODE2:

• RG1 & RG2 ONLINE
• sharevg "active" and shared fs are mounted
• NFS filesystem CLNODE1:/fs_on_shared_VG mounted to mountpoint /fs_on_shared_VG_NFS

Is that what you were asking about?
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Originally posted by: SystemAdmin

Hi grukrz1,
thanks for replying.
I am a newbie at this so not very sure of the setup.

1) Server A and B both are assigned same VG from SAN storage.

2) Server A takes possession of resources /TEST and is active (HACMP)

3) Server B using NFS shares the /TEST from Server A.

Cluster WAS Application (active:active) in Server A & B concurrently writes to /TEST.

4) When Server A crashes or goes offline, HACMP auto swing resources /TEST over to Server B and becomes active.

Server B NFS connection to Server A is lost when Server A becomes offline but empty mountpoint remains. When HACMP swing resources over (same mountpoint name), will there be problems?
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Originally posted by: SystemAdmin

I got the solution already. Actually the feature and function can be configured inside HACMP.

NFS can be configured via HACMP.
Primary node via hacmp can configure sharedvg on SAN storage
Include to export out
Specify folder name to mount
Sync the HA clusters

/NFS_share (sharedvg seen by primary node)
/abc (mounted slice seen by both primary & secondary node)

When primary node goes down, /NFS_share resource will swing over to secondary node, /abc remains intact.

Cheers

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