For one Lustre filesystem, inode count in the summary is notably less than what the individual OST inode counts would add up to:
# lfs df -i /lfs01 UUID Inodes IUsed IFree IUse% Mounted on lustrefs-MDT0000_UUID 2402287616 46560885 2355726731 2% /share/lfs01[MDT:0] lustrefs-OST0001_UUID 24117248 22883788 1233460 95% /share/lfs01[OST:1] lustrefs-OST0003_UUID 24117248 22903308 1213940 95% /share/lfs01[OST:3] lustrefs-OST0004_UUID 24117248 22895442 1221806 95% /share/lfs01[OST:4] lustrefs-OST0006_UUID 24117248 22890201 1227047 95% /share/lfs01[OST:6] filesystem_summary: 51457138 46560885 4896253 90% /share/lfs01 On another filesystem, this is not the case: # lfs df -i /lfs02 UUID Inodes IUsed IFree IUse% Mounted on lustrefs-MDT0000_UUID 1288503296 19222318 1269280978 1% /share/lfs02[MDT:0] lustrefs-OST0001_UUID 24117248 5942156 18175092 25% /share/lfs02[OST:1] lustrefs-OST0002_UUID 24117248 5816469 18300779 24% /share/lfs02[OST:2] lustrefs-OST0003_UUID 24117248 5982962 18134286 25% /share/lfs02[OST:3] filesystem_summary: 73832475 19222318 54610157 26% /share/lfs02 In fact, in the latter case, the whole is slightly greater than the sum of its parts. Any pointers regarding where I would look for an explanation would be appreciated. Youssef Eldakar Bibliotheca Alexandrina
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