Details
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Bug
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Resolution: Fixed
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Major
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Lustre 2.14.0, Lustre 2.15.0
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None
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3
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9223372036854775807
Description
For filesystems with a large number of remote entries, either because of widespread striped directory usage, migration, or rename, the REMOTE_PARENT_DIR may become full without the large_dir, causing problems for new mkdirs, rename, and other remote directory operations.
Currently, osd-ldiskfs prints an error message:
LDISKFS-fs warning (device dm-14): ldiskfs_dx_add_entry:2625: inode 203423745: comm mdt_out01_005: index 2: reach max htree level 2 LDISKFS-fs warning (device dm-14): ldiskfs_dx_add_entry:2629: Large directory feature is not enabled on this filesystem
but this is not very useful for the user, as enabling the large_dir feature requires the MDT to be unmounted (tune2fs is prevented from enabling it on the mounted filesystem due to MMP).
It makes sense to enable the large_dir feature automatically on existing ldiskfs MDT filesystems at mount time to prevent the problems associated with REMOTE_PARENT_DIR becoming full. This feature has been well supported for several releases already and is in e2fsprogs since 1.44, so there is little risk in enabling it automatically.
