On Mar 6, 2009, at 8:58 AM, Andrew Gabriel wrote:
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.)
not sure if there's another way to trigger a full flush or lockfs, but
to make sure you do have all transactions that may not have been
flushed from the ARC you could just unmount the filesystem or export
the zpool .. with the latter, then you wouldn't have to worry about
the "-f" on the import
---
.je
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