[Samba] shadow_copy and glusterfs not working

[Stefan Kania]

Hello,

we are trying to configure a CTDB-Cluster with Glusterfs. We are using
Samba 4.5 together with gluster 3.9. We set up a lvm2 thin-provisioned
volume to use gluster-snapshots.
Then we configured the first share without using shadow_copy2 and
everything was working fine.

Then we added the shadow_copy2 parameters, when we did a "smbclient" we
got the following message:

root at ng-data1:~# smbclient -m SMB3 //ctdb/gluster -k
smb: \> ls
NT_STATUS_NOT_FOUND listing \*

On a windows-system we got the message "Element not found"

Here is our smb.conf:
-------------------
[global]
        workgroup = uni
        netbios name = ctdb
        security = ads
        realm = UNI.DE
        idmap config *: range = 10000-19999
        idmap config uni: range = 1000000-1999999
        idmap config uni: backend = rid
        winbind use default domain = yes
        winbind refresh tickets = yes
        store dos attributes = yes
        map acl inherit = yes
        vfs objects = acl_xattr
        server min protocol = SMB2


[gluster]
        comment = Daten im Cluster
        guest ok = no
        read only = no
        vfs objects = acl_xattr glusterfs shadow_copy2
        glusterfs:volume = gv1
        glusterfs:logfile = /var/log/samba/gluster-gv1.log
        glusterfs:loglevel = 10
        gluster:volfile_server = localhost
        kernel share modes = no
        path = /win-share
        shadow:snapdir = /win-share/.snaps
        shadow:basedir = /win-share
        shadow:sort = desc
        shadow:snapprefix = ^S[A-Za-z0-9]*p$
        shadow:format = _GMT-%Y.%m.%d-%H.%M.%S
-------------

when we try to excess the share we get the following errormessage insite
the logfile:
--------------------
[2017-01-03 13:55:14.757049] T [rpc-clnt.c:1659:rpc_clnt_submit]
0-rpc-clnt: submitted request (XID: 0x4a Program: GlusterFS 3.3,
ProgVers: 330, Proc: 18) to rpc-transport (gv1-client-1
)
[2017-01-03 13:55:14.757291] T [rpc-clnt.c:687:rpc_clnt_reply_init]
0-gv1-client-2: received rpc message (RPC XID: 0x4b Program: GlusterFS
3.3, ProgVers: 330, Proc: 18) from rpc-transpo
rt (gv1-client-2)
[2017-01-03 13:55:14.757320] T [rpc-clnt.c:687:rpc_clnt_reply_init]
0-gv1-client-1: received rpc message (RPC XID: 0x4a Program: GlusterFS
3.3, ProgVers: 330, Proc: 18) from rpc-transpo
rt (gv1-client-1)
[2017-01-03 13:55:14.757347] D [MSGID: 0]
[client-rpc-fops.c:1095:client3_3_getxattr_cbk] 0-gv1-client-2: remote
operation failed: No data available. Path: /win-share/. (0dafa3a2-5928-4
b05-8cb2-bd90ac84d7c4). Key: security.NTACL
[2017-01-03 13:55:14.757355] D [MSGID: 0]
[client-rpc-fops.c:1095:client3_3_getxattr_cbk] 0-gv1-client-1: remote
operation failed: No data available. Path: /win-share/. (0dafa3a2-5928-4
b05-8cb2-bd90ac84d7c4). Key: security.NTACL
[2017-01-03 13:55:14.757378] D [MSGID: 0]
[client-rpc-fops.c:1106:client3_3_getxattr_cbk] 0-stack-trace:
stack-address: 0x7fd99d682310, gv1-client-1 returned -1 error: No data
available
 [No data available]
[2017-01-03 13:55:14.757378] D [MSGID: 0]
[client-rpc-fops.c:1106:client3_3_getxattr_cbk] 0-stack-trace:
stack-address: 0x7fd99d682310, gv1-client-2 returned -1 error: No data
available
 [No data available]
[2017-01-03 13:55:14.757400] D [MSGID: 0]
[afr-inode-read.c:505:afr_getxattr_cbk] 0-stack-trace: stack-address:
0x7fd99d682310, gv1-replicate-0 returned -1 error: No data available [No
data available]
[2017-01-03 13:55:14.757409] D [MSGID: 0]
[afr-inode-read.c:505:afr_getxattr_cbk] 0-stack-trace: stack-address:
0x7fd99d682310, gv1-replicate-1 returned -1 error: No data available [No
data available]
[2017-01-03 13:55:14.757429] D [MSGID: 0]
[dht-common.c:3032:dht_getxattr_cbk] 0-stack-trace: stack-address:
0x7fd99d682310, gv1-dht returned -1 error: No data available [No data availa
ble]
[2017-01-03 13:55:14.757445] D [MSGID: 0]
[defaults.c:1346:default_getxattr_cbk] 0-stack-trace: stack-address:
0x7fd99d682310, gv1-io-threads returned -1 error: No data available [No da
ta available]
[2017-01-03 13:55:14.757461] D [MSGID: 0]
[io-stats.c:2349:io_stats_getxattr_cbk] 0-stack-trace: stack-address:
0x7fd99d682310, gv1 returned -1 error: No data available [No data availab
le]
--------------------
When we do a "gluster snapshot create Snap1 gv1" we can create and use
the snapshot on the commandline, so the snapshot it self is working.
Problem seams to be the settings for shadow_copy2.

Any help will help ;-)

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