You are correct. These options are no longer required, though they continue to be accepted as no-ops because they are saved on disk. Please file an LUDOC bug for fixing the manual. If you are interested, you could also submit a patch to fix the manual as well: https://urldefense.proofpoint.com/v2/url?u=https-3A__wiki.hpdd.intel.com_... Cheers, Andreas > On Apr 11, 2015, at 10:21, Chris Hunter <chris.hunter(a)yale.edu&gt; wrote: > > Hi, > > In previous lustre versions, when creating ldiskfs OSTs, the default mount options were "errors=remount-ro,extents,mballoc". Somewhere along the way (lustre 2.5.1?) the mount options changed to "errors=remount-ro". > > I suspect the change is because mballoc & extents are now defaults of the underlying ext4 filesystem. > > FYI Section 33 of lustre admin guide documents the ldiskfs persistent mount options for commands "mkfs.lustre" & "tunefs.lustre" but the doco in these two places are different. YMMV. > > chris hunter > yale hpc group > _______________________________________________ > HPDD-discuss mailing list > HPDD-discuss(a)lists.01.org > https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.01.org_mailman...