[lustre-discuss] inodes not adding up

[Youssef Eldakar]

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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