santechie
1 Nickel

failover single CIFS server on VDM

Jump to solution

I've only done VDM failover where there was only a single CIFS server

if we have a VDM with multiple servers, is it possible to failover an individual CIFS server?

thanks

Tags (1)
0 Kudos
1 Solution

Accepted Solutions

Re: failover single CIFS server on VDM

Jump to solution

Using standard Celerra Replicator tools, only an entire VDM can be failed over, all CIFS servers and filesystems inclusive of that VDM.

For temporary use, you could snapshot the target filesystem, create a new CIFS server and mount that but the CIFS server would have to be a different name, or in an isolated AD Domain if you need the same name and it would not be something you can keep running for production.

If you wanted to be able to individually fail over each CIFS server, they would need to be in separate VDMs with dedicated IP interfaces on both sides.

0 Kudos
12 Replies

Re: failover single CIFS server on VDM

Jump to solution

Using standard Celerra Replicator tools, only an entire VDM can be failed over, all CIFS servers and filesystems inclusive of that VDM.

For temporary use, you could snapshot the target filesystem, create a new CIFS server and mount that but the CIFS server would have to be a different name, or in an isolated AD Domain if you need the same name and it would not be something you can keep running for production.

If you wanted to be able to individually fail over each CIFS server, they would need to be in separate VDMs with dedicated IP interfaces on both sides.

0 Kudos
santechie
1 Nickel

Re: failover single CIFS server on VDM

Jump to solution

Thanks Richard that confirms what I suspected to be the case

the other issue my client had with the celerra is that he feels NFS should be supported on a VDM so that during a failover

it would seamlessly bring up the CIFS for windows and NFS for the unix environment at the target site

any thoughts on this? to me it doesn't seem like that big of a deal, the target NFS should already be exported so that during failover it just becomes RW enabled and your unix hosts would just need run a mount script

0 Kudos
Highlighted

Re: failover single CIFS server on VDM

Jump to solution

You can actually create NFS exports on VDM filesystems (useful for multiprotocol filesystems) but it has to be done at the command line.  So you could export the VDM owned filesystem on the target side, and use DNS for the NFS clients...  When the VDM fails over and updates DNS for the CIFS server/share, the NFS filesystem will be there as well (same FS as CIFS in a multiprotocol filesystem example), NFS clients using DNS will fail over to the new IP address on the target Celerra and mount the export.  It would take a little up front planning but can be done in a pretty automated fashion.

dynamox
6 Thallium

Re: failover single CIFS server on VDM

Jump to solution

Can you export file system while VDM is not mounted on target Celerra ?

0 Kudos

Re: failover single CIFS server on VDM

Jump to solution

I haven't tried that, I'll see if I can attempt this on my Celerra VSA VM.

0 Kudos

Re: failover single CIFS server on VDM

Jump to solution

Okay, it doesn't appear that you can create an NFS Export for a non-existent file system but it does look like you could fail over the VDM to the target, create the NFS export, then fail back.  This would set the export for future failover operations.  Before a failover, the replication target has no shares, no mounts, and the VDM is set to unloaded.  I created a VDM, filesystem, and NFS export, then deleted the mount and unloaded the VDM, the export is still showing up in the config.

When using NFS exports in a VDM you will want to Alias the export, so use the -name option in the server_export command to give the export a short path.  The actual export path will look something like /root_vdm_#/filesystemname/...  You will want the alias to exclude the root_vdm_x portion at a minimum so that you can make the NFS export match on both sides of the replication.

The command I used (which did not include any client ACLs) was...

server_export server_2 -Protocol nfs -name testnfs /root_vdm_1/testfs

So the NFS export is just "testnfs" but that connects users to the /root_vdm_1/testfs filesystem root which is owned by my test VDM.

You can view the VDM paths with the "server_mount server_2" command in order to create the correct exports.

0 Kudos
dynamox
6 Thallium

Re: failover single CIFS server on VDM

Jump to solution

thanks for testing Richard, while this is good to know ..it's not practical in the real world. I am not going to failover and failback everytime i create new NFS exports on source.

0 Kudos

Re: failover single CIFS server on VDM

Jump to solution

Dynamox,

Out of curiosity, what are the NFS exports being used for?  Is this user data? VMWare VMs? or Oracle DNFS? other?

0 Kudos
dynamox
6 Thallium

Re: failover single CIFS server on VDM

Jump to solution

Yes

You name it Richard ..stores for vSphere, digital image repository, data stores for Confluence (our web infrastructure), learning system (Blackboard). Some of our smaller clients like to use Celerra to dump oracle db exports.

0 Kudos