Ragnar Sundblad wrote:
I was referring to the case where zfs has written data to the drive but
still hasen't issued a cache flush, and before the cache flush the drive
is reset. If zfs finally issues a cache flush and then isn't informed
that the drive has been reset, data is lost.
I hope this is not the case, on any SCSI-based protocol or SATA.
The nasty race that occurs is if your system crashes or is powered off
*after* the log has acknowledged the write, but before the bits get
shoved to main pool storage. This is a data loss situation.
With "log", do you mean the ZIL (with or without a slog device)?
If so, that should not be an issue and is exactly with the ZIL
is for - it will be replayed at the next filesystem attach and the
data will be pushed to the main pool storage. Do I misunderstand you?
See your case above - written, ack'd, but not cache flushed. We're
talking about the same thing.
--
Carson
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