From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Lelsie Rhorer" Subject: RE: RAID halting Date: Sat, 4 Apr 2009 01:44:28 -0500 Message-ID: <20090404064430.NVRF28081.cdptpa-omta04.mail.rr.com@Leslie> References: <20090402065648.GA15574@maude.comedia.it> Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20090402065648.GA15574@maude.comedia.it> Sender: linux-raid-owner@vger.kernel.org To: 'Linux RAID' List-Id: linux-raid.ids >>The issue is the entire array will occasionally pause completely for about >>40 seconds when a file is created. This does not always happen, but the >>situation is easily reproducible. The frequency at which the symptom >i wonder how costly b-tree operaton are for a 8Tb filesystem... I expect somewhat costly, but a 4 second to 2 minute halt just to create a file of between 0 and 1000 bytes is ridiculous. That, and as I said, it doesn't always happen, by a long shot, not even when transfers in the 400 Mbps range are underway. OTOH, I have had it happen when only a few Mbps transfers were underway.