[Samba] samba connection problem when volume is under LVM snapshot

[Warren Beldad]

Hello,

I have a problem when uploading file to samba server when the share's volume
is under lvm snapshot. I always got "The specified network name is no longer
available", this happens when uploading large files like 500MB and the
volume has a lvm snapshot(even 1 snapshot).  If there are no snapshots,
everything is ok, I can transfer large files without problem. my client is
windows XP.
samba version 3.0.22

What would be the caused of this kind of problem? To me it looks like samba
is closing the connection, is this because of the file system busy because
of snapshot? I can see also in the log that samba connects to the same
service a lot of times until it reaches the max connection option, then I
need again to increase the maximum connections. I have here attached a log
file during user logon then transfer files until the connection problem.

[global]
        workgroup = VM2K-MIXED0
        realm = VM2K-MIXED.NET
        server string = NAS
        smb passwd file = /etc/sysconfig/sambad/smbpasswd
        log level = 2
        log file = /var/log/samba
        max log size = 300
        debug timestamp = No
        socket options = TCP_NODELAY IPTOS_LOWDELAY
        disable spoolss = Yes
        os level = 8
        idmap uid = 10000-30000
        idmap gid = 10000-30000
        template homedir = /mnt/NAS/home/%D/%U
        template shell = /bin/bash
        winbind cache time = 15
[share1]
        comment = <new share description>
        path = /mnt/NAS/share1/share1
        valid users = admin, @users
        read only = No
        security mask = 0760
        force security mode = 0760
        directory security mask = 0770
        force directory security mode = 0770
        max connections = 200
        case sensitive = No
        volume = share1-nas

level 2 log file-------------

check_ntlm_password:  authentication for user [admin] -> [admin] -> [admin]
succeeded
warrenlt (192.168.100.170) connect to service share1 initially as user admin
(uid=500, gid=500) (pid 18058)
admin opened file 6.1-RELEASE-i386-disc1.iso read=No write=Yes (numopen=2)
netbios connect: name1=NAS164       name2=WARRENLT
netbios connect: local=nas164 remote=warrenlt, name type = 0
Closing connections
setup_new_vc_session: New VC == 0, if NT4.x compatible we would close all
old resources.
setup_new_vc_session: New VC == 0, if NT4.x compatible we would close all
old resources.
check_ntlm_password:  authentication for user [admin] -> [admin] -> [admin]
succeeded
warrenlt (192.168.100.170) connect to service share1 initially as user admin
(uid=500, gid=500) (pid 18372)
Closing connections
admin closed file 6.1-RELEASE-i386-disc1.iso (numopen=0)
warrenlt (192.168.100.170) closed connection to service share1
admin opened file 6.1-RELEASE-i386-disc1.iso read=Yes write=No (numopen=1)
admin closed file 6.1-RELEASE-i386-disc1.iso (numopen=0)
admin opened file 6.1-RELEASE-i386-disc1.iso read=No write=No (numopen=1)
admin closed file 6.1-RELEASE-i386-disc1.iso (numopen=0)
warrenlt (192.168.100.170) closed connection to service share1

thanks,
warren