From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Brown Subject: Re: Events? Date: Sun, 31 May 2009 07:46:32 +1000 Message-ID: <18977.43320.811246.171065@notabene.brown> References: <20090530194545885.SLWT5991@cdptpa-omta01.mail.rr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: message from Leslie Rhorer on Saturday May 30 Sender: linux-raid-owner@vger.kernel.org To: lrhorer@satx.rr.com Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Saturday May 30, lrhorer@satx.rr.com wrote: > > What does the "Events" field reported by -Dt signify, and why does the > number sometimes decrease? I've seen the number change, but I don't see > anything in any of the system logs corresponding to something that would > seem to relate. Changes just as device failure and adding or removing a device. Also transitions from 'active' to 'clean' and back. Sometimes the dirty->transition causes the event counter to retreat if md is use the new 'clean' state is indistinguishable from the old 'clean' state. This allows us not to always be waking up spare drives just to tell them about clean->active->clean transitions. NeilBrown