[Linux-cluster] Asking information about NFS /CS4 Cookbook

[Abhijith Das]

Hi Pattabhi,

> Hello All,
>
>  
>
>
> I have just enabled quotas on one of my GFS file system, but when i 
> run the gfs_quota list -f /GCSHome command it gives me the output of 
> the command and gets stuck, meaning it does not return back to the 
> prompt. i have to press a ctrl C to get back to the prompt.
>
>  
>
> And idea what is happening here??
>
This bug was fixed in the latest version of gfs_quota. Please update 
your packages accordingly. 
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=210362

The quota file is a hidden sparse file and quota information for 
users/groups is stored at offsets derived from their userids/groupids 
within the quota file. eg: For a userid x, the quota information would 
be at an offset 2*x*QSIZE, where QSIZE is the size of the quota 
information. Large parts of the quota file is sparse; holes with no 
valid quota information.
For the list operation gfs_quota scans through the entire quota file 
(holes and all) and only displays valid quota information.
Accidentally or intentionally assigning quota information for a big 
userid/groupid (value x from the above example) you essentially make the 
filesize 2*x*QSIZE. where x is a really big number.
It takes forever for gfs_quota to scan this huge file and gives the 
impression that it's hung.
gfs_quota is now smarter, in that, it skips all the holes in the quota 
file and reads only valid information.
Hope this helps.

>  Pattabhi Raman
>
--Abhi