Craig Sanders <[email protected]> writes:

> it's only safe to turn barriers off if disable any write-caching in
> the drive OR if you have a non-volatile write cache (e.g. hardware
> raid, something like bcache with an SSD, or ZFS with an SSD for ZIL),
  ^^^^

Not just hw raid, but hardware raid with a BBU or equivalent.  I've seen
at least one case where the BBU was an "optional extra" to make the base
price look more reasonable, and $manager didn't notice it was a separate
line item until it was too late...

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