Henry Vermaak wrote:
The first of those can at least be initiated using a sync() call, and
it's reasonable to assume that a filesystem designed for the purpose
won't get screwed if the driver finds it can no longer talk to the
storage device. However if the storage device itself is susceptible to
errors caused by power removal that is far more sinister.
The only delay I can see (after fsync) would be due to the hardware
cache of the disk in use (or a defective drive). On linux you can call
hdparm to flush on-disk caches.
But is hdparm fully supported by external Flash cards, and does it
return before or after data is guaranteed to be filly committed?
I suspect that the answer to this is going to depend on what the card
"looks like" and how it's connected.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
--
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