[Lustre-discuss] Excluding OSTs

[Jonathan Buch]

Hello group,

I'm trying to exclude a dead OST but I'm having trouble.  When I use 
`df`, it hangs until I use `lctl --device "" deactivate`.


Environment:
  * Lustre 1.8.3 RHEL5 on server-side
  * Lustre 1.8.2 patchless client-side


 From reading mailing-list entries and the Lustre 1.8 documentation, the 
deactivating has to be done on the server as well as the clients.  The 
server-side deactivation seems only to forbid creation of new objects on 
the OST.

The OST shows up as an inactive device with `lfs` on the client after 
mounting (regardless of mount options).

   mount -t lustre -o localflock,exclude=eu01-OST0003 
192.168.21.173 at tcp1:/eu01 /tmp/mnt

When mounting with the exclude= option, it should disable the OST 
completely on the client.  My problem now is, that the option does not 
seem to do what I expect.

Should the exclude= option prevent df from locking up?


Jonathan Buch

# lfs df -h
UUID                     bytes      Used Available  Use% Mounted on
eu01-MDT0000_UUID        24.4G      3.4G     19.7G   13% /tmp/mnt[MDT:0]
eu01-OST0000_UUID         3.5T      3.1T    224.0G   88% /tmp/mnt[OST:0]
eu01-OST0001_UUID         3.7T      3.2T    313.5G   86% /tmp/mnt[OST:1]
eu01-OST0002_UUID         3.7T      3.3T    146.0G   91% /tmp/mnt[OST:2]
eu01-OST0003_UUID   : inactive device
eu01-OST0004_UUID       889.2G    488.6G    355.4G   54% /tmp/mnt[OST:4]
eu01-OST0005_UUID         6.3T      2.3T      3.7T   36% /tmp/mnt[OST:5]
eu01-OST0006_UUID         6.3T      2.5T      3.4T   40% /tmp/mnt[OST:6]

filesystem summary:      24.2T     14.9T      8.1T   61% /tmp/mnt


-- 
---------------------------------------------------------------
Jonathan Buch, B.Sc.
Karlsruhe University of Applied Sciences
Institute of Materials and Processes (IMP)
Moltkestrasse 30
D-76133 Karlsruhe
Germany

E-mail:  jonathan.buch at hs-karlsruhe.de
Phone:   +49 721 925 1415
Fax:     +49 721 925 1503
http://www.iaf.hs-karlsruhe.de/ice
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