[lustre-discuss] Wrong --index set for OST

[rodger]

Dear All,

In the process of upgrading 1.8.x to 2.x I've messed up a number of the 
index values for OSTs by running tune2fs with the --index value set. To 
compound matters while trying to get the OSTs to mount I erased the 
last_rcvd files on the OSTs. I'm looking for a way to confirm what the 
index should be for each device. Part of the reason for my difficulty is 
that in the evolution of the filesystem some OSTs were decommissioned 
and so the full set no longer has a sequential set of index values. In 
practicing for the upgrade the trial sets that I created did have nice 
neat sequential indexes and the process I developed broke when I used 
the real data. :-(

The result is that although the lustre filesystem mounts and all 
directories appear to be listed files in directories mostly have 
question marks for attributes and are not available for access. I'm 
assuming this is because the index for the OST holding the file is wrong.

Any pointers to recovery would be much appreciated!

Regards,
Rodger