[LU-13030] pcc: auto_attach doesn't work after client cache cleared

Thu, 5 Dec 2019 13:13:56 +0000

PCC auto_attach feature doesn't work and no re-attach after clear caches on client.
Here is a reproducer.

PCC auto_attach feature doesn't work and no re-attach after clear caches on client.

Enable HSM
[root@c01 ~]# clush -w mds[01-02] lctl set_param mdt.*.hsm_control=enabled
mds01: mdt.ai400-MDT0000.hsm_control=enabled
mds02: mdt.ai400-MDT0001.hsm_control=enabled

Create PCC cache space
[root@c01 ~]# mkfs.ext4 /dev/sdb 
[root@c01 ~]# mount /dev/sdb /pcc 

Start HSM copytool
[root@c01 ~]# lhsmtool_posix --daemon --hsm-root /pcc --archive=1 /ai400
[root@c01 ~]# ps -ef | grep hsm
root      2872     1  0 15:09 ?        00:00:00 lhsmtool_posix --daemon --hsm-root /pcc --archive=1 /ai400
root      2874  2340  0 15:09 pts/0    00:00:00 grep --color=auto hsm

Enable PCC with projid=100
[root@c01 ~]# lctl pcc add /ai400 /pcc -p "projid={100} auto_attach=1 rwid=1"
[root@c01 ~]# lctl pcc list /ai400
/pcc:
  rwid: 1
  flags: 1f
  autocache: projid={100}

Reproducer
[root@c01 ~]# mkdir /ai400/lpcc
[root@c01 ~]# lfs project -sp 100 /ai400/lpcc/
[root@c01 ~]# echo "QQQ" > /ai400/lpcc/test
[root@c01 ~]# lfs pcc state /ai400/lpcc/test
file: /ai400/lpcc/test, type: readwrite, PCC file: /0082/0000/0403/0000/0002/0000/0x200000403:0x82:0x0, user number: 0, flags: 1c
[root@c01 ~]# echo 3 > /proc/sys/vm/drop_caches

[root@c01 ~]# lfs pcc state /ai400/lpcc/test
file: /ai400/lpcc/test, type: none
[root@c01 ~]# lfs pcc state /ai400/lpcc/test
file: /ai400/lpcc/test, type: none

After drop cache on client, 'lfs pcc state' should trigger auto_attach, but it doesn't.

Whamcloud Community JIRA

[LU-13030] pcc: auto_attach doesn't work after client cache cleared