[Openstack] Using swift with a single replica on software-defined storage

Vincenzo Pii vinc.pii at gmail.com
Wed May 27 08:28:53 UTC 2015


Let's assume that a software-defined storage system provides extremely
reliable filesystems to be used as devices in Swift rings.

For the sake of reliability, this underlying storage can be considered to
provide data integrity and availability in 100% of the cases (strong
assumption, but helpful to get to the point).

Performance in this context is really not a concern.

To avoid reducing the storage efficiency, an idea could be to use swift
with number of replicas set to 1 in this context.

My question is the following: when performance doesn't matter and
reliability is taken care of "below" swift (so swift will always manage to
read/write an object as devices will always be consistent and available),
are there other aspects that should be considered if swift runs with a
replica counter of 1?

Many thanks,
Vincenzo.
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