[lustre-discuss] a question about max_create_count

[Degremont, Aurelien]

Hello Kurt,

max_create_count is a tunable per OST. It controls how many object pre-creations could be done on each OST, by the MDT. If you set this to 0 for one OST, no additional object will be allocated there and no new file will have file stripes on it.

With the appropriate hardware, Lustre can create much more than 20,000 files simultaneously.

Aurélien

De : lustre-discuss <lustre-discuss-bounces at lists.lustre.org> au nom de Kurt Strosahl <strosahl at jlab.org>
Date : mercredi 19 juin 2019 à 22:43
À : "lustre-discuss at lists.lustre.org" <lustre-discuss at lists.lustre.org>
Objet : [lustre-discuss] a question about max_create_count

Good Afternoon,

    I'm in the process of testing a new lustre file system at 2.12, and in going through the documentation I saw that to stop writes from going to the system we now set the max_create_count to 0 on the mdt.

   I looked at that value on my system and the default seems to be 20000, am I correct in thinking that this is the maximum number of simultaneous creates that can happen on an OST?

w/r,

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