On 08/07/09 10:54, Scott Meilicke wrote:
ZFS absolutely observes synchronous write requests (e.g. by NFS or a
database). The synchronous write requests do not benefit from the
long write aggregation delay so the result may not be written as
ideally as ordinary write requests. Recently zfs has added support
for using a SSD as a synchronous write log, and this allows zfs to
turn synchronous writes into more ordinary writes which can be written
more intelligently while returning to the user with minimal latency.
Bob, since the ZIL is used always, whether a separate device or not,
won't writes to a system without a separate ZIL also be written as
intelligently as with a separate ZIL?
- Yes. ZFS uses the same code path (intelligence?) to write out the data
from NFS - regardless of whether there's a separate log (slog) or not.
Thanks,
Scott
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