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The lvchange-raid[456].sh test checks that mismatches can be detected properly. It does this by writing garbage to the back half of one of the legs directly. When performing a "check" or "repair" of mismatches, MD does a good job going directly to disk and bypassing any buffers that may prevent it from seeing mismatches. However, in the case of RAID4/5/6 we have the stripe cache to contend with and this is not bypassed. Thus, mismatches which have /just/ happened to an area that now populates the stripe cache may be overlooked. This isn't a serious issue, however, because the stripe cache is short-lived and reasonably small. So, while there may be a small window of time between the disk changing underneath the RAID array and when you run a "check"/"repair" - causing a mismatch to be missed - that would be no worse than if a user had simply run a "check" a few seconds before the disk changed. IOW, it simply isn't worth making a fuss over dropping the stripe cache before beginning a "check" or "repair" (which we actually did attempt to do a while back). So, to get the test running smoothly, we simply deactivate and reactivate the LV to force the stripe cache to be dropped and then proceed. We could just as easily wait a few seconds for the stripe cache to empty also.
This tree contains the LVM2 and device-mapper tools and libraries. For more information about LVM2 read the changelog in the WHATS_NEW file. Installation instructions are in INSTALL. There is no warranty - see COPYING and COPYING.LIB. Tarballs are available from: ftp://sourceware.org/pub/lvm2/ ftp://sources.redhat.com/pub/lvm2/ https://github.com/lvmteam/lvm2/releases The source code is stored in git: https://sourceware.org/git/?p=lvm2.git git clone git://sourceware.org/git/lvm2.git mirrored to: https://github.com/lvmteam/lvm2 git clone https://github.com/lvmteam/lvm2.git git clone git@github.com:lvmteam/lvm2.git Mailing list for general discussion related to LVM2: linux-lvm@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/linux-lvm Mailing lists for LVM2 development, patches and commits: lvm-devel@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/lvm-devel lvm2-commits@lists.fedorahosted.org (Read-only archive of commits) Subscribe from https://fedorahosted.org/mailman/listinfo/lvm2-commits Mailing list for device-mapper development, including kernel patches and multipath-tools: dm-devel@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/dm-devel Website: https://sourceware.org/lvm2/ Report upstream bugs at: https://bugzilla.redhat.com/enter_bug.cgi?product=LVM%20and%20device-mapper or open issues at: https://github.com/lvmteam/lvm2/issues The source code repository used until 7th June 2012 is accessible here: http://sources.redhat.com/cgi-bin/cvsweb.cgi/LVM2/?cvsroot=lvm2.