From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mikhail Pershin Date: Wed, 20 Aug 2008 23:42:39 +0400 Subject: [Lustre-devel] [RFC] "lctl readonly" modification proposal In-Reply-To: References: Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lustre-devel@lists.lustre.org On Wed, 20 Aug 2008 21:39:13 +0400, Peter Braam wrote: > If I remember correctly the flush is only there to try to reduce > rollback. Also to be sure that all before barrier is on disk, many test cases about recovery rely on the fact that operations before barrier are on disk. This is important with HARD failure case especially, without sync before barrier the operations before barrier may be lost and affect the tests. I agree that syncless variant of barrier is needed but we also need barrier with sync depending on test case. -- Mikhail Pershin Staff Engineer Lustre Group Sun Microsystems, Inc.