[LU-17655] lfs setstripe --stripe-count 0 --stripe-size 0 cannot change the pfl file/dir to use default attribute

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: WC Triage
• Reporter: Sarah Liu

Description

I am not sure if this is a problem or suppose to work this way, but I found if use
"lfs setstripe --stripe-count 0" or "--stripe-size 0" won't change the PFL layout to default stripe count or size, but the --stripe-index 0 can do.

This related to the sanity 204a/204e failure in LU-16904 patch:
https://testing.whamcloud.com/test_sets/dc893d55-0536-47b7-a21d-5e88d8fd584f

[root@trevis-88vm4 lustre]# mkdir tdir
[root@trevis-88vm4 lustre]# lfs getstripe tdir/
tdir/
  lcm_layout_gen:    0
  lcm_mirror_count:  1
  lcm_entry_count:   2
    lcme_id:             N/A
    lcme_mirror_id:      N/A
    lcme_flags:          0
    lcme_extent.e_start: 0
    lcme_extent.e_end:   65536
      stripe_count:  1       stripe_size:   4194304       pattern:       raid0       stripe_offset: -1

    lcme_id:             N/A
    lcme_mirror_id:      N/A
    lcme_flags:          0
    lcme_extent.e_start: 65536
    lcme_extent.e_end:   EOF
      stripe_count:  2       stripe_size:   1048576       pattern:       raid0       stripe_offset: -1

[root@trevis-88vm4 lustre]# lfs setstripe --stripe-size 0 /mnt/lustre/tdir/
[root@trevis-88vm4 lustre]# lfs getstripe tdir/
tdir/
  lcm_layout_gen:    0
  lcm_mirror_count:  1
  lcm_entry_count:   2
    lcme_id:             N/A
    lcme_mirror_id:      N/A
    lcme_flags:          0
    lcme_extent.e_start: 0
    lcme_extent.e_end:   65536
      stripe_count:  1       stripe_size:   4194304       pattern:       raid0       stripe_offset: -1

    lcme_id:             N/A
    lcme_mirror_id:      N/A
    lcme_flags:          0
    lcme_extent.e_start: 65536
    lcme_extent.e_end:   EOF
      stripe_count:  2       stripe_size:   1048576       pattern:       raid0       stripe_offset: -1

[root@trevis-88vm4 lustre]# lfs setstripe --stripe-count 0 /mnt/lustre/tdir/
[root@trevis-88vm4 lustre]# lfs getstripe tdir/
tdir/
  lcm_layout_gen:    0
  lcm_mirror_count:  1
  lcm_entry_count:   2
    lcme_id:             N/A
    lcme_mirror_id:      N/A
    lcme_flags:          0
    lcme_extent.e_start: 0
    lcme_extent.e_end:   65536
      stripe_count:  1       stripe_size:   4194304       pattern:       raid0       stripe_offset: -1

    lcme_id:             N/A
    lcme_mirror_id:      N/A
    lcme_flags:          0
    lcme_extent.e_start: 65536
    lcme_extent.e_end:   EOF
      stripe_count:  2       stripe_size:   1048576       pattern:       raid0       stripe_offset: -1

[root@trevis-88vm4 lustre]# lfs setstripe --stripe-index 0 /mnt/lustre/tdir/
[root@trevis-88vm4 lustre]# lfs getstripe tdir/
tdir/
stripe_count:  1 stripe_size:   4194304 pattern:       raid0 stripe_offset: 0

[root@trevis-88vm4 lustre]# 
[root@trevis-88vm4 lustre]# lctl get_param -n lov.lustre-clilov-\*.stripesize
4194304
[root@trevis-88vm4 lustre]# lctl get_param -n lov.lustre-clilov-\*.stripecount
1

Issue Links

• is related to: LU-64 lfs getstripe output inconsistent for directory default value
• is related to: LU-16904 initial test script to run sanity.sh and sanityn.sh with PFL layout