From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stan Hoeppner Subject: Re: Array created by mdadm 3.2 & 3.3 have different array size Date: Thu, 27 Mar 2014 00:52:06 -0500 Message-ID: <5333BC86.8090205@hardwarefreak.com> References: <53334347.4050108@hardwarefreak.com> Reply-To: stan@hardwarefreak.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Tide , linux-raid@vger.kernel.org List-Id: linux-raid.ids On 3/26/2014 9:44 PM, Tide wrote: > Stan Hoeppner hardwarefreak.com> writes: >> >> On 3/26/2014 3:00 PM, Tide wrote: >> ... >>> ================= >>> Array 2 (RAID 6): >>> ================= >>> # mdadm --examine /dev/sdb1 >> ... >>> Raid Level : raid6 >>> Raid Devices : 5 >> ... >>> Bad Block Log : 512 entries available at offset 72 sectors >> >> The RAID6 array has sectors on each drive reserved for bad block >> reassignment. The RAID5 array does not. >> >> This is the answer to your mystery. > "The RAID6/RAID5 array", do you mean my RAID array (just this instance), or > you mean "all RAID6/RAID5 arrays created by mdadm" ? My reply above is unambiguous. I quoted your array data and gave an answer that applies to your provided array data. WRT your other questions, I do not have time to research the answer to those, and wouldn't spend it on that if I did. I have never used CentOS nor Fedora, and don't plan to ever use either. For those answers, either wait for someone to answer, or research it yourself. Cheers, Stan