[LU-9751] ZFS snapshot doesn't work when using RSH

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.12.0
• Affects Version/s: Lustre 2.10.0
• Severity: 3
• Assignee: nasf (Inactive)
• Reporter: Sarah Liu

Description

build: b2_10 #2 tag-RC1

When testing the ZFS Snapshot with Subdir Mount, I found that the lctl snapshot_* command only works with ssh, with rsh, it returns error. I have tried with both snapshot_create and list, both return the same error.

with ssh:

[root@onyx-69 ~]# lctl snapshot_list -d -F lustre --name test-snap
Password: 

filesystem_name: lustre
snapshot_name: test-snap

snapshot_role: MDT0000
Password: 
modify_time: Fri Jul  7 21:26:41 2017
create_time: Fri Jul  7 21:26:41 2017
snapshot_fsname: 55284e9 
Password: 
status: not mount

snapshot_role: OST0000
modify_time: Fri Jul  7 21:26:41 2017
create_time: Fri Jul  7 21:26:41 2017
snapshot_fsname: 55284e9 
status: not mount

try with same environment but with rsh option

[root@onyx-69 ~]# lctl snapshot_list -d -F lustre --name test-snap -r rsh
bash: zfs: command not found
Can't list the snapshot test-snap
[root@onyx-69 ~]# 

The rsh did work between nodes.

[root@onyx-69 ~]# rsh onyx-70
Last login: Fri Jul  7 21:26:07 from onyx-69.onyx.hpdd.intel.com
[root@onyx-70 ~]#

Comments

[Gerrit Updater]

Fan Yong ([e-mail]) uploaded a new patch: https://review.whamcloud.com/27999
Subject: LU-9751 snapshot: set PATH for remote zfs commands
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: aaadad709778cba02bdb22aaac17613df63356e2

[Sarah Liu]

env is
MDS/MDT onyx-69
OST onyx-70
client onyx-23vm1

[root@onyx-69 ~]# lctl snapshot_list -F lustre -n test -r ssh

filesystem_name: lustre
snapshot_name: test
snapshot_fsname: 7cf6c78 
create_time: Tue Jul 11 18:55:53 2017
modify_time: Tue Jul 11 18:55:53 2017
status: not mount
[root@onyx-69 ~]# lctl snapshot_list -F lustre -n test -r rsh
bash: zfs: command not found
Can't list the snapshot test
[root@onyx-69 ~]# lctl snapshot_list -F lustre -n test

filesystem_name: lustre
snapshot_name: test
snapshot_fsname: 7cf6c78 
create_time: Tue Jul 11 18:55:53 2017
modify_time: Tue Jul 11 18:55:53 2017
status: not mount

[nasf (Inactive)]

Thanks Sarah. If you still have the environment, I can login and try by myself.

[Sarah Liu]

yes, before rsh, it failed with ssh since I didn't setup the keyless. Then I want to try with the easy way(rsh) and failed.
I will try the commands and update you.

[nasf (Inactive)]

Sat Jul  8 01:33:28 2017 (33860:jt_snapshot_list:2161:lustre:ssh): Can't list snapshot test with detail <no>: -22
Sat Jul  8 01:37:17 2017 (33964:jt_snapshot_list:2161:lustre:rsh): Can't list snapshot test with detail <no>: -22

The log shows that the snapshot_list has ever failed with "ssh" before the "rsh" failure, right? Would you please to try the following:

lctl snapshot_list -F lustre --name test-snap -r ssh
lctl snapshot_list -F lustre --name test-snap -r rsh
lctl snapshot_list -F lustre --name test-snap

Thanks!

[nasf (Inactive)]

Sarah,

Would you please to attach the log file /var/log/lsnapshot.log? Thanks!

[Peter Jones]

Fan Yong

Can you please advise on this one?

Thanks

Peter