[Lustre-discuss] 1.6.4.2 -> 1.8.0.1 Upgrade Question

[Charles Taylor]

We are about to upgrade our standalone MGS/MDS (no failover) from  
1.6.4.2 to 1.8.0.1.    I'm a little confused by section 13.2.4 of the  
Lustre 1.8 Operations Manual.     What is the purpose of the

mdt1# tunefs.lustre --mgs --mdt --fsname=testfs /dev/sda1

command?    I assume it is writing this information to the MDT (/dev/ 
sda1) but wan't that information alright put there when the file  
system was created under 1.6.4.2?    Has the format changed between  
the two versions?    Why is the tunefs.lustre step necessary?    I'm  
concerned about overwriting *anything* on the MDT and rendering our  
file system unusable.   I just want to be sure we understand what we  
are doing.

The paragraph labeled "Description" in section 32.2 (describing  
tunefs.lustre) did not exactly give me a warm-fuzzy.

BTW, we already have a number of 1.8.0.1 clients running against the  
1.6.4.2 servers.     Working great so far!

Thanks,

Charlie Taylor
UF HPC Center
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/attachments/20090722/3243a384/attachment.htm>