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тАО11-14-2010 08:11 AM
тАО11-14-2010 08:11 AM
a customer wants to use standard instead of multi-site, so there will be a single VLAN/ IP-subnet over both sited. With two nodes no problem, but what about four nodes and two-way replication?
Thanks for you help.
Regards,
Patrick
Patrick
Solved! Go to Solution.
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тАО11-14-2010 09:21 AM
тАО11-14-2010 09:21 AM
Re: Four node P4000 cluster stretched over two sites
Steven
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
RHCE
NPP3 (Nutanix Platform Professional)
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тАО11-14-2010 10:13 AM
тАО11-14-2010 10:13 AM
Re: Four node P4000 cluster stretched over two sites
that's the point. As far as I remember correctly this is only guaranteed if you're using a multi-site cluster. But in this case, customer has to route the iscsi traffic between the VLANs and you have to use "fixed" path policy for VMware vSphere, so you can't use multipathing with the round-robin policy.
Regards,
Patrick
Patrick
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тАО11-14-2010 11:22 AM
тАО11-14-2010 11:22 AM
Re: Four node P4000 cluster stretched over two sites
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тАО11-14-2010 12:14 PM
тАО11-14-2010 12:14 PM
Re: Four node P4000 cluster stretched over two sites
I thought that two VIPs are mandatory for a multi-site cluster, as well as two sites and two subnets?! Is there any doc where this is described?
Thank.
Regard,
Patrick
Patrick
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тАО11-14-2010 12:30 PM
тАО11-14-2010 12:30 PM
SolutionAX696-96004
On page 1:
1 Designing a Multi-Site SAN
...
* Multi-Site clusters that @@can@@:
-- Span up to three sites
-- Span multiple subnets
-- Have multiple VIPs
On page 22:
* Creating Multi-Site clusters and volumes
...
Add one or more VIPs, depending on the number of subnets you have configured.
And I have set up a Multi-Site cluster with one VIP.
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тАО11-14-2010 08:30 PM
тАО11-14-2010 08:30 PM
Re: Four node P4000 cluster stretched over two sites
thanks for clarification.
Regards,
Patrick
Patrick
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тАО11-15-2010 06:57 AM
тАО11-15-2010 06:57 AM
Re: Four node P4000 cluster stretched over two sites
Anyway, we are using one VIP and one subnet. Technically we have Multi-Site setup from the LeftHand Management Console as we have defined multiple sites so the cluster reports as multi-site, but from talking to LeftHand, this is more logical than functional.
The real important part is understanding how two-way replication works with more than two nodes. Simply put, you need to make sure that the nodes listed in the "Edit Cluster" window are ordered Site A, Site B, Site A, Site B.
This will have the effect that each two way replication node will have site resiliency, but it does not mean you can lose one node from each site without LUN's going offline. You can lose one node or both nodes from one site and keep all your LUN's online.
I hope this makes sense.
Kevin