On Mon, 14 Jun 2010, Roy Sigurd Karlsbakk wrote:
There is absolutely no sense in having slog devices larger than
then main memory, because it will never be used, right?
ZFS will rather flush the txg to disk than reading back from
zil? So there is a guideline to have enough slog to hold about 10
seconds of zil, but the absolute maximum value is the size of
main memory. Is this correct?
ZFS uses at most RAM/2 for ZIL
It is good to keep in mind that only small writes go to the dedicated
slog. Large writes to to main store. A succession of that many small
writes (to fill RAM/2) is highly unlikely. Also, that the zil is not
read back unless the system is improperly shut down.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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