On Tue, Feb 16, 2021 at 9:46 AM Kurt Strosahl <[email protected]> wrote:
> During a maintenance window today I revooted the OSS that OST had been > mounted on, after it came up the usage dropped significantly > Kurt, That behavior you describe sounds a bit like issues reported on this list a while back: Data migration from one OST to anther http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/2019-March/016304.html Migrating files doesn't free space on the OST http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/2019-January/016196.html I thought that those problems were addressed in more recent versions of Lustre though. Perhaps someone else can verify that. You aren't running a very old version, are you? Hope this helps, Nathan > ------------------------------ > > *From:* Iannetti, Gabriele <[email protected]> > *Sent:* Tuesday, February 16, 2021 10:02 AM > *To:* Kurt Strosahl <[email protected]>; [email protected] < > [email protected]> > *Subject:* [EXTERNAL] Re: Disabling max creates and migrating data > doesn't seem to be reducing the usage on an OST > > Hi Kurt, > > one more thing... > > The I-Node count should not increase, since new files should not be > created on that OST. > You can check the I-Node count with `lfs df -i | grep "\[OST:15\]"`. > > Modifications on existing files are still possible e.g. file increases in > it's size... > > ~Gabriele > > ________________________________________ > From: lustre-discuss <[email protected]> on behalf > of Kurt Strosahl <[email protected]> > Sent: Thursday, February 11, 2021 16:51 > To: [email protected] > Subject: [lustre-discuss] Disabling max creates and migrating data doesn't > seem to be reducing the usage on an OST > > 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 > losp.lustre19-OST000f-osc-MDT0000.max_create_count=0 > > 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 > > w/r, > > Kurt J. Strosahl > System Administrator: Lustre, HPC > Scientific Computing Group, Thomas Jefferson National Accelerator Facility > > _______________________________________________ > lustre-discuss mailing list > [email protected] > http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org >
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