We are running Lustre 2.4.0-21chaos (see http://github/com/chaos/lustre), and most likely of particular interest are these two patches that we are carrying:

• LU-3934 scrub: detect upgraded from 1.8 correctly
• LU-3420 scrub: trigger OI scrub properly

We now find that, at least on the ldiskfs MDS nodes, OI scrub runs on every start up of the MDS. The console message looks something like this:

2014-01-28 09:27:28 sumom-mds1 login: LustreError: 0-0: lsc-MDT0000: trigger OI scrub by RPC for [0x7e4d2310f09:0x2ddf:0x0], rc = 0 [1]

Given the frequency of MDS reboots (i.e. often) required lately for other bugs, OI scrub is running far too much.