From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandre Oliva Subject: modifying degraded raid 1 then re-adding other members is bad Date: Tue, 08 Aug 2006 06:38:19 -0300 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid , linux-kernel List-Id: linux-raid.ids Assume I have a fully-functional raid 1 between two disks, one hot-pluggable and the other fixed. If I unplug the hot-pluggable disk and reboot, the array will come up degraded, as intended. If I then modify a lot of the data in the raid device (say it's my root fs and I'm running daily Fedora development updates :-), which modifies only the fixed disk, and then plug the hot-pluggable disk in and re-add its members, it appears that it comes up without resyncing and, well, major filesystem corruption ensues. Is this a known issue, or should I try to gather more info about it? This happened with 2.6.18rc3-git[367] (not sure which), plus Fedora development patches. -- Alexandre Oliva http://www.lsd.ic.unicamp.br/~oliva/ Secretary for FSF Latin America http://www.fsfla.org/ Red Hat Compiler Engineer aoliva@{redhat.com, gcc.gnu.org} Free Software Evangelist oliva@{lsd.ic.unicamp.br, gnu.org}