[Lustre-discuss] Renaming an existing lustre filesystem

[James Robnett]

    I re-read the 1.8 manual and man8 of tunefs and I don't feel any
more confident in the exact syntax than I did Friday.   There's some
1.4 to 1.6 migration examples and a renaming snapshot example but
they differ in ways that concern me.

In fact my initial attempt

    I'm fairly certain with a combined MDT/MGS the command
tunefs.lustre --writeconf --fsname={name} /dev/{dev}

is incorrect as it generated MGS errors, resubmitting the command
with --fsname={origname} allowed the MDT to be mounted but now
MGS complains when the OST's try to mount that it doesn't know about
them.

   I assume the proper sequence (with everything unmounted) is

   tunefs.lustre --writeconf --mgs --fsname="foobar" /dev/XXX
on the MDT/MGS

   and for each OST

  tunefs.lustre --writeconf --mgsnode={MGS_IP_ADDR}@tcp0 
--fsname="foobar" /dev/XXX

   but I'm leary of mucking things up further.

   BTW,  this is my test lustre install not the production one so it's
not exactly the end of the world if it's destroyed though there is some
benchmark data on it I'd like to recover so I'd prefer not.

James


James Robnett wrote:
> I thought this would be trivial but after looking at the tunefs.lustre
> docs I find I'm not 100% positive.
> 
> I have a single MDS server and 4 OSSes each with 2 OSTs.  Currently
> all OST's and the MDT are unmounted.
> 
> I would like to change the filesystem name without damaging any data.
> 
> Looking at examples it's not entirely clear to me whether I need to do
> anything on the OSSes and what the exact syntax for tunefs should be
> on the MDS.
> 
> Could somebody provide the proper options/flags I need and whether the
> OSSes do or don't need to be informed.
> 
> for example
> 
> 
> James Robnett
> 
> 
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