[Lustre-discuss] how to add force_over_8tb to MDS

[Cliff White]

This error message you are seeing is what Andreas was talking about - you
must use the
ext4-based version, as you will not need any option with your size LUNS. The
'must use force_over_8tb'
error is the key here, you most certainly want/need to *.ext4.rpm versions
of stuff.
cliffw


On Thu, Jul 14, 2011 at 11:10 AM, Theodore Omtzigt
<theo at stillwater-sc.com>wrote:

> Michael:
>
>    The reason I had to do it on the OST's is because when issuing the
> mkfs.lustre command to build the OST it would error out with the message
> that I should use the force_over_8tb mount option. I was not able to
> create an OST on that device without the force_over_8tb option.
>
> Your insights on the writeconf are excellent: good to know that
> writeconf is solid. Thank you.
>
> Theo
>
> On 7/14/2011 1:29 PM, Michael Barnes wrote:
> > On Jul 14, 2011, at 1:15 PM, Theodore Omtzigt wrote:
> >
> >> Two part question:
> >> 1- do I need to set that parameter on the MGS/MDS server as well
> > No, they are different filesystems.  You shouldn't need to do this on the
> OSTs either.  You must be using an older lustre release.
> >
> >> 2- if yes, how do I properly add this parameter on this running Lustre
> >> file system (100TB on 9 storage servers)
> > covered
> >
> >> I can't resolve the ambiguity in the documentation as I can't find a
> >> good explanation of the configuration log mechanism that is being
> >> referenced in the man pages. The fact that the doc for --writeconf
> >> states "This is very dangerous", I am hesitant to pull the trigger as
> >> there is 60TB of data on this file system that I rather not lose.
> > I've had no issues with writeconf.  Its nice because it shows you the old
> and new parameters.  Make sure that the changes that you made were the what
> you want, and that the old parameters that you want to keep are still in
> tact.  I don't remember the exact circumstances, but I've found settings
> were lost when doing a writeconf, and I had to explictly put these settings
> in tunefs.lustre command to preserve them.
> >
> > -mb
> >
> > --
> > +-----------------------------------------------
> > | Michael Barnes
> > |
> > | Thomas Jefferson National Accelerator Facility
> > | Scientific Computing Group
> > | 12000 Jefferson Ave.
> > | Newport News, VA 23606
> > | (757) 269-7634
> > +-----------------------------------------------
> >
> >
> >
> >
> >
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-- 
cliffw
Support Guy
WhamCloud, Inc.
www.whamcloud.com
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