From Wei Zhou: 

The problem is when the resizing started somehow drbd-overview showed “Connected” instead of “SyncSource" or "PausedSyncS" in the output; therefore “resize2fs drbd0” cmd didn’t run. See here: 

  0:drbd-pgsql/0 Connected Primary/Secondary UpToDate/UpToDate C r----- /var/lib/postgresql ext4 99G 102M 95G 1% 

This issue happened before. When it happened though, there was no indication that resize2fs didn’t occur and that caused problem later on when the file system was in use. My commit https://git.starlingx.io/cgit/stx-config/commit/?id=0bc78c4c44492f588d43e1f77f750b06e4381d80 added error indication like what you saw in the sysinv.log that resizing not complete. 

I resized database fs again and this time it passed.

[root@controller-1 conductor(keystone_admin)]# system controllerfs-list 
+--------------------------------------+---------------------+------+-----------------------+------------+-----------+ 
| UUID | FS Name | Size | Logical Volume | Replicated | State | 
| | | in | | | | 
| | | GiB | | | | 
+--------------------------------------+---------------------+------+-----------------------+------------+-----------+ 
| 14d87794-3528-43f5-bd9b-ee2f4100a1c6 | backup | 96 | backup-lv | False | available | 
| 13b6ac56-9948-4785-b0a9-60039a812343 | database | 38 | pgsql-lv | True | available | 
| a548b0da-fa40-403b-9aa8-517609b73487 | docker | 30 | docker-lv | False | available | 
| 837ccfcd-98a0-433f-bb3b-e51026a16f90 | docker-distribution | 16 | dockerdistribution-lv | True | available | 
| 845735ec-b46c-48cc-ab46-083e60ae804d | etcd | 5 | etcd-lv | True | available | 
| afb9ac97-7567-4695-9130-d288bfdb2cfd | extension | 1 | extension-lv | True | available | 
| 9bd1fbc4-5042-4201-830e-0590e00f909e | glance | 10 | cgcs-lv | True | available | 
| 508281f7-4e23-40d8-b720-794bda97240a | gnocchi | 5 | gnocchi-lv | False | available | 
| 1ff1aa08-7c10-4fd4-9a10-59dbba87add0 | img-conversions | 38 | img-conversions-lv | False | available | 
| 310035f7-523a-4343-9073-67065ae525cf | scratch | 8 | scratch-lv | False | available | 


2019-03-29 08:56:49.051 93401 INFO sysinv.conductor.manager [-] _controller_config_active_apply about to resize the filesystem 
2019-03-29 08:56:49.054 93401 WARNING sysinv.conductor.manager [-] resizing filesystems 
2019-03-29 08:56:49.275 93401 INFO sysinv.conductor.manager [-] resizing filesystems drbd connected 
2019-03-29 08:56:49.370 93401 INFO sysinv.openstack.common.rpc.common [req-e2b6f39f-366a-49fc-b638-d1f3a35709b8 None None] Connected to AMQP server on 192.168.204.2:5672 
2019-03-29 08:56:49.499 93401 INFO sysinv.conductor.manager [-] Performed drbdadm resize all 
2019-03-29 08:56:49.883 93401 INFO sysinv.conductor.manager [-] drbd-overview: pgsql-75.0, cgcs-9.9, extension-0.96875, patch-vault-0, etcd-4.8, dockerdistribution-16.0 
2019-03-29 08:56:49.884 93401 INFO sysinv.conductor.manager [-] lvdisplay: pgsql-76.0, cgcs-10.0, extension-1.0, patch-vault-0, etcd-5.0, dockerdistribution-16.0 
2019-03-29 08:56:57.342 93401 WARNING sysinv.conductor.manager [-] resizing filesystems not completed 
2019-03-29 08:57:45.283 93401 INFO sysinv.conductor.manager [-] _controller_config_active_apply about to resize the filesystem 
2019-03-29 08:57:45.283 93401 WARNING sysinv.conductor.manager [-] resizing filesystems 
2019-03-29 08:57:45.660 93401 INFO sysinv.conductor.manager [-] resizing filesystems drbd connected 
2019-03-29 08:57:45.869 93401 INFO sysinv.conductor.manager [-] drbd-overview: pgsql-75.0, cgcs-9.9, extension-0.96875, patch-vault-0, etcd-4.8, dockerdistribution-16.0 
2019-03-29 08:57:45.870 93401 INFO sysinv.conductor.manager [-] lvdisplay: pgsql-76.0, cgcs-10.0, extension-1.0, patch-vault-0, etcd-5.0, dockerdistribution-16.0 
2019-03-29 08:57:52.709 93401 WARNING sysinv.conductor.manager [-] resizing filesystems not completed