[Lustre-discuss] when reformat doesn't mean reformat

[Jim Harm]

I believe it would be better to have mkfs.lustre with the option 
"--reformat" do a reformat
instead of saving configuration and rebuilding the OST and then 
restoring the old, obsolete configuration
that I was trying to change.

If you want to reformat an OST and keep the configuration, it should 
be some other option.
This "--reformat" retains the OST name and mount options and 
last_rcvd and volume name.
That does not seem to me to be a "reformat".

Instead, I have to (after the "--reformat"), tunefs.lustre with 
writeconf and erase_params
(repeating the options that I thought would be written with the 
mkfs.lustre) and
then I have to go in and tune.ldiskfs the volume name, too.

It appears the only way to REALLY reformat is to dd 0s into first 10k 
blocks, or so.
then redo the mkfs.lustre with desired options.

sigh; maybe i missed it in the manual or previous email, sorry, if 
that's the case.

-- 
}}}===============>>  LLNL
James E. Harm (Jim); jharm at llnl.gov
System Administrator, ICCD Clusters
(925) 422-4018 Page: 423-7705x57152