[Lustre-discuss] OST targets not mountable after disabling/enabling MMP

[Edward Walter]

Using 'tune2fs -f -E clear-mmp' causes tune2fs to segfault:
tune2fs 1.40.11.sun1 (17-June-2008)

Bad options specified.

Extended options are separated by commas, and may take an argument which
        is set off by an equals ('=') sign.

Valid extended options are:
        stride=<RAID per-disk chunk size in blocks>
        stripe-width=<RAID stride*data disks in blocks>
        test_fs
        ^test_fs
Segmentation fault

Did you use a newer version of tune2fs/e2fsprogs?  Our current version 
is e2fsprogs-1.40.11.sun1-0redhat.  Do you know if it's safe to rev up 
versions on e2fsprogs while running an older lustre kernel revision (1.6.6)?

Thanks again.

-Ed



Ken Hornstein wrote:
>> This gives me an MMP error though:
>> [root at oss-0-25 log]# tune2fs -E clear-mmp /dev/sdd
>> tune2fs 1.40.11.sun1 (17-June-2008)
>> tune2fs: MMP: appears fsck currently being run on the filesystem while 
>> trying to open /dev/sdd
>> Couldn't find valid filesystem superblock.
>>     
>
> Oh, I forgot ... did you try adding the -f flag?  E.g.:
>
> # tune2fs -f -E clear-mmp /dev/sdd
>
> According to the tune2fs man page, when you use clear-mmp, you also need
> the -f flag.  Still being able to mount the filesystm read-only would
> make sense to me, since that wouldn't affect fsck being run.
>
> --Ken
>
>