[Lustre-discuss] Replacing faulty OSS/OST

Jon Tegner tegner at foi.se
Tue Oct 21 00:44:09 PDT 2014

Hi again,

We are running lustre 2.5.3 on a small system, consisting of one 
combined MGS/MDT and four combined OSS/OSTs. One of the OSS/OSTs has 
faulty hardware, and need to be replaced. The procedure I plan on using 
is the following.

1. Deactivate the faulty OSS.
2. Make a file-level backup of it (not much data on it).
3. Temporarily deactivate it.

The manual seems clear on how to perform these steps, what I'm a bit 
uncertain about is how I introduce the replacement machine (which will 
be a complete new one). Are there certain steps I need to take into 
account, e.g., can will it be possible to create the new OST file system 
with the old ost_index?

4. Once the replacement is up, and its OST activated, the backup should 
be restored. In the manual it is stated that e2label should be used to 
set the file system label (based on the old ost_index in hex as I 
understand it - a bit curious on this point, since I thought that would 
be taken care of "automatically" (I have never done this when creating 
OSTs before).

Thanks again!



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