On Nov 30, 2009, at 8:30 PM, Chris Frost wrote:
Will a write(2) to a ZFS file be made durable atomically?
Yes or no, as specified by the options set at open(2).
Note: it is worthwhile to know if your hardware honors cache flush
requests, otherwise all bets are off.
Under the hood in ZFS, writes are committed using either shadow
paging or
logging, as I understand it. So I believe that I mean to ask whether a
write(2), pushed to ZPL, and pushed on down the stack, can be split
into
multiple transactions? Or, instead, is it guaranteed to be committed
in a
single transaction, and so committed atomically?
ZPL is the ZFS POSIX Layer. I believe you meant to say the ZFS intent
log (ZIL) instead. There is a lot of material online about the ZIL
and how
it works. Neil's blog is often cited:
http://blogs.sun.com/perrin/entry/the_lumberjack
-- richard
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