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[Discuss] HA storage

Derek Martin wrote:
>  - provide redundant, replicating data storage (expensive: think
>    redundant replicating disk array, such as the expensive solutions
>    EMC provides for this purpose)
>  - connect your storage to all of the nodes in your cluster
> The only hard part is paying for the redundant storage.  My now-
> defunct former employer was developing a (relatively) cheap solution
> that replaced the expensive EMC array with cheaper redundant RAID
> arrays, but that product was subsumed by Red Hat.

Rich Braun wrote:
> I'm posting this after a frustrating 24 hours with old technologies
> AoE (ATA over Ethernet)...  AoE comes up OK but by itself
> accomplishes nothing beyond a collection of universally accessible
> raw disk blocks.

How about iSCSI? Is that any more solid on Linux than AoE?

You'll still need a clustering file system to layer on top if you're are
going to have multiple storage nodes, which is assumed. I guess once
you've take on that complexity, then there is less to be gained by
separating your storage nodes from your compute nodes (from an HA
perspective; may still make sense from a performance perspective).

(The old way to address this was with a dual-headed NAS, but clustering
file systems with multiple nodes seems to be the way the cloud providers
are heading. Software is cheaper than hardware...)


Tom Metro
The Perl Shop, Newton, MA, USA
"Predictable On-demand Perl Consulting."

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