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11-25-2012 05:59 AM - last edited on 11-26-2012 06:26 PM by Cathy_xu
11-25-2012 05:59 AM - last edited on 11-26-2012 06:26 PM by Cathy_xu
Only 2 Controllers to implement Multi site HA/VMWare with HP P4000
Hi all,
I want to know if I can implement a multisite HA/VMWare olution using P4000 with only 2 controllers.
I will put each one controllers in each site, and implement Network RAID 10.
Is it possible ?
Regards.
Rafael Bianchini
P.S.This thread has been moved from Storage Area Networks (SAN) (Small and Medium Business) to HP StoreVirtual / HP LeftHand Storage- HP Forums Moderator
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11-27-2012 06:26 AM
11-27-2012 06:26 AM
Re: Only 2 Controllers to implement Multi site HA/VMWare with HP P4000
Yes you can. However, you'll also need to implement a virtual FOM instance for best practice and to keep the SAN up if a node goes offline.
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11-27-2012 07:56 AM
11-27-2012 07:56 AM
Re: Only 2 Controllers to implement Multi site HA/VMWare with HP P4000
if this is really just for DR and you are thinking about it just because the features are included for free with the SAN/iQ software, I would advise you read the multi-site HA/DR readme first and then read it again. A multi-site cluster, while available with the software you purchased, adds significant complications to your setup. You really need three sites (the third can be a cheap hosted site w/ minimal bandwidth, but you really do need that third site) and bandwidth and latency between your two main sites become a major concern and any interruption to that will interrupt your SAN.
Look at remote snapshot replaction before going to a multi-site san and only go to the multi-site option if you 100% have to have 100% uptime. If you go remote snapshot, best practice is to run two management groups so you don't have to worry about multi-site quorum as well. You can still do a good DR solution w/ remote snapshots with failover as well.
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11-28-2012 05:45 PM
11-28-2012 05:45 PM
Re: Only 2 Controllers to implement Multi site HA/VMWare with HP P4000
Thank you for your reply.
I'm looking for other information about this solution. Can you help me ?
I intend put one VMWare ESXi host more one P4300 Controller, with 7.2 Tb, in each local (2 sites in this case) and establish a Network RAID 10 with a dedicated and redundant optical fiber.
So, after i will configure VMWare HA to complete the DR and High Avaiability solution.
What do you think about this ? And the FOM, is it realy necessary in this case ? Remember, i will use only 2 controllers (enclousers) ( not 4 - 2 per site).
Basicaly, my project is (the SAN part) :
Site A Site B
Host ESXi A Host ESXi B
| | | |
SW ------------FO------------- SW
| | | |
P4000 A P4000 B (just 1 controller per site)
Please, make comments.
Best regards.
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11-29-2012 05:35 AM
11-29-2012 05:35 AM
Re: Only 2 Controllers to implement Multi site HA/VMWare with HP P4000
read the manual and HA guide as listed on the P4000 software page. It will answer all of your questions.
Yes you must have a FOM and technially a 3rd site. Think about a failover solution and how it will be handled. Control of the cluster is handled through a voting quorum... it is impossible to get a majority vote with TWO members, the minimum needed is three which means a FOM for automatic failover or a virtual manager for manual failover, but if you are actually trying to do a multi-site cluster, you would be totally contradicting yourself if in one breath you say you require multi-site and the other breath you say I'm ok with manually restoring quorum.
Why do you think you need a true multi-site cluster and not just go with using remote replication for DR?
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11-29-2012 06:26 AM
11-29-2012 06:26 AM
Re: Only 2 Controllers to implement Multi site HA/VMWare with HP P4000
I'm thinking about P4000 multisite because i want to delivery a automatic failover / dr project whithout VMWare SRM.
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11-29-2012 07:24 AM
11-29-2012 07:24 AM
Re: Only 2 Controllers to implement Multi site HA/VMWare with HP P4000
really read that HA manual HP provides. The multi-site feature is included with the Lafthand software, but the cost for you to actually impliment it successfully is typically much more significant. Have you considered latency/bandwidth/uptime of your VPN? Those costs typically make multi-sites a no-go for anybody who is thinking about doing it just because its available.
The HA/DR manual from HP is very complete with what is needed so it shoudl answer all of your questions. The critical issue is that you cannot skimp on the latency/bandwith to the remote site as that is likely to be your slowest point in the system and for a multi-site cluster the data has to be written to both before the write is confirmed.