[Lustre-discuss] Removing OSTs

[Mervini, Joseph A]

It is possible but it's painful and probably depends on the reason. I had a situation a while back where the script I was using to mkfs.lustre had the wrong fsname applied and as a result added the OST to the wrong lustre file system. 

After realizing my mistake I backed out and reformatted the OSTs with the right parameters. The problem was that file system still had those OSTs registered and produced lots of errors. I tried to fix it by doing things like deactivate the OSTs, etc., but nothing worked. My only option appeared to be to reformat the entire file system. However, since I had nothing to lose I tried and successfully used tunefs.lustre --writeconf on the OSTs and MDT to remove and re-registration the OSTs with the MDS and everything came back fine. 

That being said, there was no data on the OSTs that I removed. I can't say what might happen to the file system if there is. 

-----Original Message-----
From: lustre-discuss-bounces at lists.lustre.org [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Mag Gam
Sent: Monday, November 02, 2009 7:15 PM
To: lustre-discuss at lists.lustre.org
Subject: [Lustre-discuss] Removing OSTs

Is it possible to remove a OST permanently on 1.8.x?
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