[LU-7813] default pool not inherited when specifying any layout parameter

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.9.0, Lustre 2.11.0
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Andreas Dilger

Description

When creating a new file with a specific layout in a directory that has a default layout, none of the default layout parameters are inherited at all. For example, setting the default striping to use size 65536 bytes on OST2 in the video pool:

# lfs pool_list myth.audio
Pool: myth.audio
myth-OST0001_UUID
myth-OST0002_UUID
# mkdir /myth/tmp/ost2
# lfs setstripe -S 65536 -i 1 -p audio /myth/tmp/ost1audio
# lfs getstripe -d /myth/tmp/ost3audio
stripe_count:   1 stripe_size:    65536 stripe_offset:  1 pool:           audio
# touch /myth/tmp/ost1audio/orig
touch /myth/tmp/ost1audio/orig
[adilger@twoshoes ~]$ lfs getstripe /myth/tmp/ost1audio/orig
lmm_stripe_count:   1
lmm_stripe_size:    65536 ✅
lmm_stripe_offset:  1 ✅
lmm_pool:           audio ✅
	obdidx		 objid		 objid		 group
	     1	       1147360	     0x1181e0	             0
# lfs setstripe -S 1M /myth/tmp/ost1audio/new
# lfs getstripe /myth/tmp/ost1audio/new
lmm_stripe_count:   1
lmm_stripe_size:    1048576 ✅
lmm_stripe_offset:  3 ❌
	obdidx		 objid		 objid		 group
	     3 	       1147358	     0x1181de	             0

This file did not inherit the the OST pool from the default layout, and as a result it was also allocated from a file that was not in the pool.

# lfs setstripe -c 2 /myth/tmp/ost1audio/next
# lfs getstripe /myth/tmp/ost1audio/next
lmm_stripe_count:   2 ✅
lmm_stripe_size:    65536  ✅
lmm_stripe_offset:  3 ❌
obdidx        objid    objid        group
     3	       1147359	     0x1181df             0
	     1	        859771	      0xd1e7b	             0

The stripe_size was used for the new allocation, but the OST pool was not inherited, and as a result a of that the stripes are not constrained to which OSTs are involved.

Issue Links

• is related to: LU-10369 running "lfs setstripe -c3 /mnt/lustre/pooldir/newfile" doesn't inherit pool
• is related to: LU-8264 lfs setstripe without -p pool_name doesn't inherit pool from parent/ROOT directory
• is related to: LU-7660 FS default striping settings only honored on MDT 0
• is related to: LU-7335 store default filesystem layout directly on root inode