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тАО07-29-2010 05:39 AM
тАО07-29-2010 05:39 AM
That being said, I'm having a small issue with a cluster. I have it created with two nodes. When I try to point my initiator at the cluster IP, I get a target error. If I instead try to use the IP of either cluster node, it connects without any problem. I've been reading about the failover manager but I'm not sure if that is the missing piece or not.
What am I doing wrong?
Solved! Go to Solution.
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тАО07-29-2010 09:54 AM
тАО07-29-2010 09:54 AM
Re: Can't attach to new cluster
FOM is only needed when you have multiple sites as backup. It shouldn't be necessary with your two units.
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тАО07-29-2010 10:35 AM
тАО07-29-2010 10:35 AM
Re: Can't attach to new cluster
Are you saying that I should attach to one of the nodes directly instead? What happens when that node dies, as there is nothing to redirect the request to the other node?
btw thanks for the reply. It's not easy not knowing what you're doing ;)
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тАО07-29-2010 06:31 PM
тАО07-29-2010 06:31 PM
Re: Can't attach to new cluster
1) Create Management group and cluster
2) Create server and assign initiator iqn
3) Create volume and assign to the server created in step 2.
4) Connect initiator point it to the VIP.
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тАО07-30-2010 04:43 AM
тАО07-30-2010 04:43 AM
Re: Can't attach to new cluster
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тАО07-30-2010 05:17 AM
тАО07-30-2010 05:17 AM
Re: Can't attach to new cluster
(http://secadmin.wordpress.com/2009/01/16/iscsi-configuration-with-lefthand-and-quorum-management/)
"So at work we decided to go with a Lefthand Implementation of iSCSI, I am rather unhappy to find out that with only 2 units you have to run a virtual machine to complete the Quorum for redundancy."
So now I am confused as to whether or not I need something between the two SANs to act as the quorum. Is this the case? If I have two units in my cluster, do they handle everything themselves with the VIP or is there a missing piece to this puzzle? In the first reply, Bryan said I just need a manager, but not the failover manager. Which manager was he referring to?
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тАО07-30-2010 05:54 AM
тАО07-30-2010 05:54 AM
SolutionThe way that the P4000 / Lefthand works is that you need to maintain quorum or you will lose access to your volumes if it is lost in the management group.
With a two node cluster then if you lose 1 node quorum will be lost. To get round this you can use a failover manager (FOM) OR a virtual manager (VM).
The FOM is installed under ESX and has no storage capabilities - just a vote really. Therefore in a two node cluster + FOM you have 3 votes. Q = 2. Lose a storage node - no problem Q mainatained by FOM. This is all automatic so volumes stay online.
With the VM you need to create this but you may find that CMC has already created it for you when you created your management group/cluster in the first place. If not just create it.
However DO NOT start the VM! You only start the VM if you lose a node and then if this happens you have to manually start the VM on the surviving node to regain quorum. Note you will lose access to volumes until you start the VM.
When the "failed" node is back/fixed then just stop the VM.
Hopefully that will clear that up for you ?
Mark...
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тАО07-30-2010 06:12 AM
тАО07-30-2010 06:12 AM
Re: Can't attach to new cluster
If I want automatic redundancy, it would appear that I do need to run the FOM. I can't have a node go down and then wait for some alert so that I can run to the console and manually activate the VMan. If I install the FOM under ESX and bring it up, do I just scan for it with the CMC? There doesn't seem to be much in the way of options for FOM. Can I assume that the CMC will find the FOM and link it in automagically? Otherwise, I can't see a way to make the FOM aware of the cluster nodes.
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тАО07-30-2010 06:30 AM
тАО07-30-2010 06:30 AM
Re: Can't attach to new cluster
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тАО07-30-2010 06:45 AM
тАО07-30-2010 06:45 AM
Re: Can't attach to new cluster
Looks like you're on the right path though.