On Sun, 08 Jan 2012 20:51:06 -0800 Keith Keller <kkeller@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > On 2012-01-09, Keith Keller <kkeller@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > md/raid:md0: cannot start dirty degraded array. > > Upon further reading (specifically man md), it looks like this is the > tail reason for the array not starting--the kernel will refuse to start > arrays in this condition. If I'm reading the docs and other posts > accurately, it seems like I can use a kernel parameter (since this isn't > my /, I should also be able to unload and re-load the md module) to > force the kernel to start the array, at which point in theory I should > be able to work with it (including, ultimately, an xfs_repair if > needed). But OTOH, it seems like this parameter applies only to / on > mdraid, and --force should have started the array, so I'm not really > sure what to make of it. > > I've posted this before, but the kernel I'm using is fairly recent, > 2.6.39-4.el5 from ELrepo. > > --keith > --assemble --force certainly should start dirty/degraded array. There was a bug a while back where it didn't. Maybe you should try a newer mdadm. Alternately: echo 1 > /sys/module/md_mod/parameters/start_dirty_degraded and try again. That is an easy way to set the module parameter after the module is loaded. NeilBrown
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