Error:

mount error(6): No such device or address
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

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Samba server Settings:
[root@test1 ~]#cat /etc/samba/smb.conf
Global Settings:
[global]

    workgroup = test
    server string = Samba Server Version %v
    #log files split per-machine:
    log file = /var/log/samba/log.%m
    #maximum size of 50KB per log file, then rotate:
    max log size = 50
    security = user
    passdb backend = tdbsam
    load printers = no
    cups options = raw

The home Settings
[homes]

    comment = Home Directories
    browseable = no
    writable = yes
    create mode = 0664
    directory =0755

Projects

    comment = smbuser's home
    path    = /share
    browseable = yes
    writable = yes
    write list = @users

3 . font – family: tahoma; mso – bidi – font – family: tahoma;从/etc/samba/smb.Load smb configuration file conf
rlimit_max: increase rlimit_max(1024) to the minimum window limit (16384)
Process section “[homes]”
Processing section “[project]”
Loaded service file OK.
Server role:ROLE_STANDALONE
View service definition dumps by enter
# global parameters
(Global)

    server string = Samba Server Version %v
    workgroup = TEST
    log file = /var/log/samba/log.%m
    max log size = 50
    load printers = No
    security = USER
    idmap config * : backend = tdb
    cups options = raw

(home)

    comment = Home Directories
    path = 0755
    browseable = No
    create mask = 0664
    read only = No

(project)

    comment = smbuser's home
    path = /share
    read only = No
    write list = @users

Client mount
[root@test2 ~]# mount -t cifs //2.2.1.2/user1/mnt-o username=user1,password=4321
Retrying with upper case share name
mount error(6): No such device or address
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

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Check found an error setting for the server:
Solution: Change directory = 0755 in the home directory to Directory Mode = 0755
[homes]

    comment = Home Directories
    browseable = no
    writable = yes
    create mode = 0664
    directory **mode** = 0755

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Testparm didn’t detect a problem, so it took a long time. The key is carefulness, carefulness!