From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfgang Denk Subject: Re: Huge values of mismatch_cnt on RAID 6 arrays under Fedora 18 Date: Mon, 28 Jan 2013 00:10:04 +0100 Message-ID: <20130127231004.6C4082033CC@gemini.denx.de> References: <20130127192656.634892005AD@gemini.denx.de> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Return-path: In-reply-to: Sender: linux-raid-owner@vger.kernel.org To: Chris Murphy Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Dear Chris Murphy, In message you wrote: > > Well, you have a block on each drive that's supposed to be identical, > and if there's a mismatch that means they're not identical and it's > ambiguous which one is correct. So if the data on the drives is > unimportant to retrieve correctly, then I guess it's not a critical > error. Heh, would I be running a RAID 6 array if the data was unimportant? > What's the smartctl -a look like for all drives? I imagine one or more > have bad sectors, ECC errors, or UDMA/CRD errors. I see a some Hardware_ECC_Recovered; very few disks have 1 Reallocated_Sector_Ct; there are no (0) Current_Pending_Sector, Offline_Uncorrectable, UDMA_CRC_Error_Count, Multi_Zone_Error_Rate, or Data_Address_Mark_Errs. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de If God wanted me to touch my toes, he'd have put them on my knees.