lvm1 on raid1 devices not working after upgrade from 2.4 to 2.6.8 on debian upgrade from woody -> sarge

[Thomas Stegbauer]

Thomas Stegbauer schrieb:

>hi lvm-maintainer's,
>hi mario,
>
>we run several machines with software-raid1 on a debian woody with a
>selfcompiled vanilla 2.4.?? kernel with lvm and raid1 compiled-in (not
>as a module).
>
>we mostly used /dev/md1 (sda1 and sdb1) as boot, /dev/md0 (sda2 and
>sdb2) as / and /dev/md2 (sda3 and sdb3) as one big volume-group vg0.
>sda4 and sdb4 are used as swap without raid.
>
>this worked fine the last years.
>
>we use dual-i686, single-i686, amd-k6 with scsi-disk's and ide-disk's.
>(ide disks as hda and hdc ;)
>
>now me made several upgrades to debian sarge what worked fine and
>upgraded also to kernel 2.6.8-2 from debian-sarge (which means mdadm and
>lvm2)
>
>after the next reboot, mdadm and lvm starts from rcS.d with S25 in parallel.
>
>at this point, the lvm script complains about:
>found duplicate PV xxxxx: using /dev/sdb3 not /dev/sda3 what is wrong at
>this point!! cause it should only use /dev/md2 instead!
>
>afterwards mdadm complains:
>failed to add /dev/sda3 to /dev/md2 device or resource busy
>could not lock unknown-block (8,3)
>and builds md2 only with sdb3
>
>the machine works afterwards fine, with a broken mirror.
>
>afterwards i set md_component_detection = 1 in /etc/lvmconf/lvm.conf
>this causes, no lvm is found and the machine have no usr, var and so on,
>what comes from the lvm!
>
>but the really bad thing is; /dev/md2 is ok and looks to be in a fine
>state, it does not recognize that it is not consistent!!!
>
>the same happens if someone have the bad idea and start the old kernel
>2.4.x!!
>
>
>now set md_component_detection = 0 and move /etc/rcS.d/S25lvm to S26lvm.
>after the reboot you have desaster and you lost your data from the lvm
>(by the way the same happens, if you start the old 2.4.x)!
>
>cause mdadm builds the raid and set it consistent, but it isn't!! and
>lvm starts of a inconsistent array, where the system thinks it is
>consistent!
>
>voila and xfs on the volume crashes
>
>any ideas?
>
>btw: i dont have any editor anymore when i dont have a /usr :(
>
>greetings
>thomas
>
>  
>
hi lvm-maintainer's,

it looks like i have a fix.

/etc/rcS.d/S25lvm needs to be moved to /etc/rcS.d/S26lvm


i dont know how to go on, cause imho it is very important to provide
fixed installation-medium's, so the user NEVER start's the system with
the scripts in parallel.

cause if the system get once started with lvm and mdadm-raid get started
with S25, you are nearly to loose all your data on lvm!

greetings
thomas



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# Thomas Stegbauer
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