[LU-20013] 'lfs mirror extend/create -N 1 FILE` tries to process file '1'

• Type: Bug
• Resolution: Fixed
• Priority: Medium
• Fix Version/s: Lustre 2.18.0
• Affects Version/s: Lustre 2.17.0
• Labels: easy flr-improvement lfs
• Severity: 3
• Assignee: Chakshu Kansal
• Reporter: Andreas Dilger

Description

Running "lfs mirror extend -N 1 FILE" (or "mirror create -N 1") tries to add a mirror to (or create) the file "1" instead of setting the mirror count to 1:

# lfs mirror extend -N 1 /myth/tmp/adilger/pflfile
error: lfs extend: 1: cannot get layout: Invalid argument
# lfs mirror create -N 2 /myth/tmp/adilger/mirror_file2
lfs mirror mirror: lfs create: cannot create composite file '2': Permission denied (13)

While the correct syntax is "-N1", and this behavior is strictly correct, it is counter-intuitive for users.

It would be better to handle this as users expect, by checking if a the mirror count has not been specified, but a filename of "1-9" is specified, and use that to set the mirror count.

Issue Links

• is related to: LU-18770 lfs mirror extend -N=<count> does not set mirror count correctly
• is related to: LU-16446 'lfs mirror extend' should allow specifying total mirror count