[lustre-discuss] Large directory feature is not enabled

[Mohr Jr, Richard Frank (Rick Mohr)]

What options are enabled on your MDT when you run this command:

   tune2fs -l <mdt_device> | grep "Filesystem features"

--
Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences
http://www.nics.tennessee.edu

> On Apr 28, 2015, at 4:15 PM, Scott Shaw <sshaw at sgi.com> wrote:
> 
> I am running into a problem with a MDTEST benchmark with a single directory.  It appears I hit a file limit per directory using a single directory but a unique directory test completes successfully.  While running the metadata benchmark I ran into the following error message.   
> 
> MDS Server log file:
> Apr 24 08:45:38 lst-ddn kernel: LDISKFS-fs warning (device md0): ldiskfs_dx_add_entry: Large directory feature isnot enabled on this filesystem
> Apr 24 08:45:39 lst-ddn kernel: LDISKFS-fs warning (device md0): ldiskfs_dx_add_entry: Directory (ino: 1149763587) index full, reach max htree level :2
> Apr 24 08:45:39 lst-ddn kernel: LDISKFS-fs warning (device md0): ldiskfs_dx_add_entry: Large directory feature isnot enabled on this filesystem
> 
> How do I enable the "Large directory feature"?  Checking HPDD Intel site, this feature htree level 3 is still in the works.  We are using Lustre v2.6 but the website is not clear to me if there is a temporary workaround to solve this issue.
> 
> Following is the MDTEST command line executed on the compute nodes and the output;
> 
> Command line used: ../mdtest-1.9.3/mdtest -d /lustre/sshaw/mdtest -z 0 -b 0 -n 65536 -C -T -r -F
> Path: /lustre/sshaw
> FS: 1198.9 TiB   Used FS: 2.1%   Inodes: 1185.5 Mi   Used Inodes: 0.3%
> 
> 384 tasks, 25165824 files
> 04/24/2015 08:46:07: Process 14(r1i0n0): FAILED in create_remove_items_helper, unable to create file: No space left on device
> 04/24/2015 08:46:08: Process 23(r1i0n0): FAILED in create_remove_items_helper, unable to create file: No space left on device
> 
> Any ideas how to resolve this issue by enabling "large directory feature"?  
> 
> Scott
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