[LU-13748] 'lfs setstripe -C -1' stripes too widely

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Labels: easy
• Severity: 3
• Assignee: Andreas Dilger
• Reporter: Andreas Dilger

Description

Creating a file with overstriping using "-C -1" exceeds the maximum stripe count of 2000, resulting in a file that has an excessively-large xattr, which the client may have difficulty accessing:

# lfs setstripe -E 128M -c 1 --comp-flags=prefer -E eof -C -1 /mnt/lustre/file0

# lfs getstripe /lustre/fs0a92/client/file129
/lustre/fs0a92/client/file129
  lcm_layout_gen:	3
  lcm_mirror_count:  1
  lcm_entry_count:   2
	lcme_id:         	1
	lcme_mirror_id:  	0
	lcme_flags:      	init,prefer
	lcme_extent.e_start: 0
	lcme_extent.e_end:   134217728
  	lmm_stripe_count:  1
  	lmm_stripe_size:   1048576
  	lmm_pattern:   	raid0
  	lmm_layout_gen:	0
  	lmm_stripe_offset: 7
  	lmm_objects:
  	- 0: { l_ost_idx: 7, l_fid: [0x100070000:0xcef:0x0] }

	lcme_id:         	2
	lcme_mirror_id:  	0
	lcme_flags:      	init
	lcme_extent.e_start: 134217728
	lcme_extent.e_end:   EOF
  	lmm_stripe_count:  2719
  	lmm_stripe_size:   1048576
  	lmm_pattern:   	raid0,overstriped
  	lmm_layout_gen:	0
  	lmm_stripe_offset: 9
  	lmm_objects:
  	- 0: { l_ost_idx: 9, l_fid: [0x100090000:0xe5:0x0] }
  	- 1: { l_ost_idx: 10, l_fid: [0x1000a0000:0xc5:0x0] }
  	- 2: { l_ost_idx: 11, l_fid: [0x1000b0000:0xc5:0x0] }
  	- 3: { l_ost_idx: 12, l_fid: [0x1000c0000:0xe5:0x0] }
  	- 4: { l_ost_idx: 13, l_fid: [0x1000d0000:0xe5:0x0] }
...

In some cases, running "lfs getstripe -v" on the file causes the client to crash.

Issue Links

• is duplicated by: LU-17199 'lfs setstripe -C -1' can be set beyond overstripe count > 2000
• is related to: LU-16420 sanity test_51d: FAIL: stripecount=3: OST 1 has more objects vs. OST 0
• is related to: LU-16938 "lfs setstripe -C -1" stripes too widely, should be limited to OST_COUNT
• is related to: LU-9162 Option to set max stripe count per filesystem