Jim Dunham wrote:
ZFS the filesystem is always on disk consistent, and ZFS does maintain
filesystem consistency through coordination between the ZPL (ZFS POSIX
Layer) and the ZIL (ZFS Intent Log). Unfortunately for SNDR, ZFS
caches a lot of an applications filesystem data in the ZIL, therefore
the data is in memory, not written to disk, so SNDR does not know this
data exists. ZIL flushes to disk can be seconds behind the actual
application writes completing, and if SNDR is running asynchronously,
these replicated writes to the SNDR secondary can be additional
seconds behind the actual application writes.
Unlike UFS filesystems and lockfs -f, or lockfs -w, there is no
'supported' way to get ZFS to empty the ZIL to disk on demand.
I'm wondering if you really meant ZIL here, or ARC?
In either case, creating a snapshot should get both flushed to disk, I
think?
(If you don't actually need a snapshot, simply destroy it immediately
afterwards.)
--
Andrew
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
