[LU-1388] Maximum Number of Files per Directory

• Type: Bug
• Resolution: Duplicate
• Priority: Minor
• Affects Version/s: Lustre 1.8.7
• Environment: 1.8.x; 2.1.x
• Severity: 4
• Assignee: Peter Jones
• Reporter: Roger Spellman (Inactive)

Description

Both the 1.8 and 2.1 manuals say the following in section 33.8.

Maximum Number of Files or
Subdirectories in a Single Directory
Lustre uses the ext3 hashed directory code, which has a limit of about 25 million files.
On reaching this limit, the directory grows to more than 2 GB depending on the
length of the filenames. The limit on subdirectories is the same as the limit on regular
files in all later versions of Lustre due to a small ext3 format change.

Is this still accurate? Isn't Lustre using ext4 by default, so shouldn't the limit be higher?

What is the limit now for 1.8.7 and 2.1.x ?

Thanks.