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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