[lustre-discuss] Target names changing when mounting

[Andrus, Brian Contractor]

All,

I find this very confusing..
I created a new lustre filesystem (WORK2) by creating and MDT and a single OST.
When I first create them, the names shown for Target have different values from 'Read precious values' and 'Permanent disk data'
The difference is a hyphen '-' versus a colon ':'

   Read previous values:
Target:     WORK2-MDT0000

   Permanent disk data:
Target:     WORK2:MDT0000

The ext2 label on the disk matches the Permanent disk data.
BUT....
When I mount it (mount -t lustre) the Permanent disk data changes to use a colon and the e2label changes....
   Read previous values:
Target:     WORK2-MDT0000

   Permanent disk data:
Target:     WORK2-MDT0000

THEN...
If I do a tunefs.lustre --writeconf , it changes the Permanent disk data AND the e2label to use an equal '=' sign:

   Read previous values:
Target:     WORK2-MDT0000

   Permanent disk data:
Target:     WORK2=MDT0000

Next time I mount it changes it back to the hyphen '-'
So.. What the heck???
This is all with the stock lustre RPMs:
lustre-osd-ldiskfs-2.7.0-2.6.32_504.8.1.el6_lustre.x86_64.x86_64
lustre-osd-ldiskfs-mount-2.7.0-2.6.32_504.8.1.el6_lustre.x86_64.x86_64
lustre-modules-2.7.0-2.6.32_504.8.1.el6_lustre.x86_64.x86_64
lustre-2.7.0-2.6.32_504.8.1.el6_lustre.x86_64.x86_64
kernel-2.6.32-504.8.1.el6_lustre.x86_64

Now the problem/annoyance is the fact that this changes links in /dev...
And an equal sign '=' is NOT a happy character for device names...
I am also highly suspicious this affects some of the mappings in the MGS and MDT which is causing great grief...


Brian Andrus
ITACS/Research Computing
Naval Postgraduate School
Monterey, California
voice: 831-656-6238

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