SAN/cluster drive mirroring following on http://www.experts-exchange.com/Storage/Misc/Q_27715600.html

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Following up on this post:
http://www.experts-exchange.com/Storage/Misc/Q_27715600.html

Assume I have a system set up as described in the post above. I have one server - Server1 - in a cluster that has directly attached storage and the other - server2 - sees that directly attached storage as ISCSI or via some virtualized ISCSI arrangement or any other protocol that would allow clustering of drives.  In that situation the directly attached storage on server 1 is a single point of failure. Assume I have the resources to attach an equivalent amount of directly attached storage to server B. Would any of the Virtual Storage Appliance software described in the original post - or any other software - allow me to mirror the directly attached storage on server A to the directly attached storage on server B?  I am willing to look at both 'live' synchronization and not-so-live but very frequent synchronization - no more than an hour between synchronizations?
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VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
All the software listed previously provides Highly Available Clustered and Mirrored Storage, there is no single point of failure.

if a server node fails storage is still available on other nodes.

storage is replicated between server nodes.

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Commented:
Thanks as always for your quick reply and knowledge.  This mirroring is above and beyond Windows clustering, correct?  So in my example if the physically directly attached storage on server1 crashes/suffers catastrophic failure - dunked with a vat of acid - the directly attached drives on server 2 will be a mirror of the last synch time - possibly right up to date if that type of synching is available?
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
Yes, this mirroring and replication is part of the Virtual Storage Array, its nothing to do with any OS or Microsoft.

This is what makes this VSA SAN powerful, as it does not have a single point of failure, like most hardware SANs.

Yes Correct, and the more Host Servers you have the better the resilience.

All are available as trials, its impressive to turn OFF a node, and your VMs are still running!

No single point of failure.
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In the op scenario , YES you do have a SPoF as the failure of Server1 will mean that Server2 cannot see/access the storage that was directly connected to Server1.

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Commented:
Connollyg:
If I understood Hancocka when Server1 goes down and the drives directly attached to it go down as well at the same time Server2 will see the drives directly attached to it which were a mirror of the drives attached to Server1 up to the time Server 1 went down if I chose to have that type of 'instant' mirroring via the Virtual Storage Appliance software.
Right, using the VSA means your data is still available, but if it is not RAID protected it will be at risk, as you now have no redundancy!

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Commented:
Thanks for all the good info.

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