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

Related — Tue, 12 Dec 2017 19:30:31 +0000

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.

Whamcloud Community JIRA

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