[lustre-discuss] Disabling max creates and migrating data doesn't seem to be reducing the usage on an OST

Kurt Strosahl strosahl at jlab.org
Thu Feb 11 07:51:01 PST 2021

Good Morning,

One of the OSTs in a lustre file system I manage is showing a higher usage.  I attempted to stop writes by setting the max_create_count to zero and then moving data off it but that doesn't seem to be working.

> lfs df | grep OST:15lustre19-OST000f_UUID 71145018368 62653382656  8491631616  89% /lustre19[OST:15]

MDS> lctl set_param osp.lustre19-OST000f*.max_create_count=0
MDS> lctl get_param osp.lustre19-OST000f*.max_create_count

lfs find /lustre19/expphy/volatile --ost lustre19-OST000f -size +50M | lfs_migrate -y

I've been watching it, and the ost in question isn't shrinking.  I can see its size usage go down a bit... and then tick up a bit


Kurt J. Strosahl
System Administrator: Lustre, HPC
Scientific Computing Group, Thomas Jefferson National Accelerator Facility
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