[Lustre-discuss] removing ost

Marc Boisis-Delavaud mdelavau at univ-lr.fr
Fri Mar 23 02:15:07 PDT 2012


Hello,
I want to remove an ost from my lustre filsystem. My version is 1.8.4.

I've deactivated home-OST0004 on my mds
lctl > dl
  0 UP mgc MGC10.149.0.2 at o2ib d00cdda9-5757-d58d-c5a5-073225015995 5
  1 UP mdt MDS MDS_uuid 3
  2 UP lov home-mdtlov home-mdtlov_UUID 4
  3 UP mds home-MDT0000 home-MDT0000_UUID 89
  4 IN osc home-OST0004-osc home-mdtlov_UUID 5
  5 UP osc home-OST0003-osc home-mdtlov_UUID 5
  6 UP osc home-OST0002-osc home-mdtlov_UUID 5
  7 UP osc home-OST0001-osc home-mdtlov_UUID 5
  8 UP osc home-OST0000-osc home-mdtlov_UUID 5
  9 UP lov scratch-mdtlov scratch-mdtlov_UUID 4
 10 UP mds scratch-MDT0000 scratch-MDT0000_UUID 85
 11 UP mgs MGS MGS 91
 12 UP osc scratch-OST0000-osc scratch-mdtlov_UUID 5


From a client I've made : lfs find --obd home-OST0004_UUID /Recherche | lfs_migrate -y

Most of the files have been moved to the others OST but now the "lfs find --obd home-OST0004_UUID /Recherche"  find nothing but the home-OST0004  is not empty !

 # lfs df -i
UUID                      Inodes       IUsed       IFree IUse% Mounted on
home-MDT0000_UUID       24275160     5268561    19006599  21% /Recherche[MDT:0]
home-OST0000_UUID      335544320     2627858   332916462   0% /Recherche[OST:0]
home-OST0001_UUID      335544320      673756   334870564   0% /Recherche[OST:1]
home-OST0002_UUID      335544320      917063   334627257   0% /Recherche[OST:2]
home-OST0003_UUID      335544320      927120   334617200   0% /Recherche[OST:3]
home-OST0004_UUID      335544320         560   335543760   0% /Recherche[OST:4]
filesystem summary:     24275160     5268561    19006599  21% /Recherche

# lfs df  -h
UUID                       bytes        Used   Available Use% Mounted on
home-MDT0000_UUID          81.0G        1.1G       75.3G   1% /Recherche[MDT:0]
home-OST0000_UUID           4.9T        2.0T        2.7T  39% /Recherche[OST:0]
home-OST0001_UUID           4.9T        1.0T        3.7T  20% /Recherche[OST:1]
home-OST0002_UUID           4.9T        1.4T        3.3T  28% /Recherche[OST:2]
home-OST0003_UUID           4.9T        1.3T        3.3T  27% /Recherche[OST:3]
home-OST0004_UUID           4.9T      480.0M        4.7T   0% /Recherche[OST:4]

filesystem summary:        24.6T        5.7T       17.7T  23% /Recherche



How can I see what stay on home-OST0004  ?








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