On Sat, 27 Dec 2014 04:59:51 PM you wrote:
> Power supply means bigger capex and less redundancy, as the emergency
> procedure in case of power failure is less deterministic than with
> controlled battery-backed cache. 

Yes, the whole  auto shut-down procedure is rather more complex and fragile 
for a UPS than a controller cache

> Anyway XFS nobarrier
> does not bring enough performance boost to be enabled by my
> experience.

It makes a non-trivial difference on my (admittedly slow) setup, with write 
bandwidth going from 35 MB/s to 51 MB/s

-- 
Lindsay

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