Details
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Improvement
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Resolution: Fixed
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Major
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2.5.1, 3.0.1
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None
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Security Level: Public
Description
In the Couchbase Server manual we state that iSCSI block devices and SANs are supported, but we make no reference at all to them being a Single Point of Failure.
The manual should be updated to include a strong recommendation against using shared storage, probably in the "Cluster design considerations" section.
For example, from Perry's blog (http://blog.couchbase.com/how-many-nodes-part-3-hardware-considerations):
"Use the best "local" storage you have available. Our best practice and architecture revolves around a distributed system. We recommend against using a centralized backend storage system such as a SAN or NAS. While these may be able to live up to the performance needs, they present a single bottleneck / point of failure (even if HA) that limits the distributed nature of Couchbase. The benefits of having a shared storage may outweigh this, but it’s something to take into consideration."