[Lustre-discuss] questions about an OST content

[Ashley Pittman]

On 6 Nov 2010, at 14:24, Bob Ball wrote:

> I am emptying a set of OST so that I can reformat the underlying RAID-6 
> more efficiently.  Two questions:
> 1. Is there a quick way to tell if the OST is really empty?  lfs_find 
> takes many hours to run.

lfs df -i from a client or simply df -i from the OSS node will tell you whilst the OST in on-line, when it's offline you can remount it as type ldiskfs and use ls to verify that it's really empty.

> 2. When I reformat, I want it to retain the same ID so as to not make 
> "holes" in the list.  From the following information, am I correct to 
> assume that the id is 24?  If not, how do I determine the correct ID to 
> use when we re-create the file system?

"tunefs.lustre --print /dev/sdj" will tell you the index in base 10.

Ashley.