[LUDOC-171] Document "lfs setstripe" behavior when the second setstripe with a different attribute reset the first attribute value

• Status: Resolved
• Project: Lustre Documentation
• Type: Improvement
• Priority: Minor
• Reporter: Young Jong Pao
• Assignee: Lustre Manual Triage
• Resolution: Won't Fix

Environment

Lustre 2.0 Operations Manual
32.1 lfs

Description

If one stripe attribute is changed on a default directory, then a 2nd setstripe command is issued to change a different stripe attribute, the first change is lost. e.g. if lfs setstripe is used to adjust the stripe size from default, and another lfs setstripe cmd is issued to adjust the stripe count, the stripe size reverts back to the default.

1. lfs setstripe -s 65536 /mnt/lustre/dir
   crystal:/lus/scratch # lfs getstripe /mnt/lustre/dir
   /mnt/lustre/dir
   stripe_count: 1 stripe_size: 65536 stripe_offset: -1

1. lfs setstripe -c 2 /mnt/lustre/dir
2. lfs getstripe /mnt/lustre/dir
   /mnt/lustre/dir
   stripe_count: 2 stripe_size: 1048576 stripe_offset: -1

stripe_size is reset to its default value of 1048576.

Is it possible to document this in the Lustre 2.X Operations Manual and/or in the man page?

Issue Links

• duplicates: LU-11603 lfs setstripe of directory one stripe...

Comments

[Cory Spitz]

Another way of characterizing this quirk is that setstripe is not 'additive'.

[Andreas Dilger]

This was fixed in the Lustre code in 2.9+ - the setstripe will inherit the parameters that are not specified from the directory.