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[Samba] Samba - slow performance




Hello,

We have a small setup where we write files on a Windows system to a
samba mounted location coming from a linux system.  This linux system
has NVME disks and 10gige connections.  We are getting slow write
performance and our setup should be able to get better write speeds.
I am attaching our config files and hoping someone can assist with
tuning our smb.conf for getting better performance:

--
# cat /etc/samba/smb.conf
[global]
workgroup = XXX
server string = Samba Server %V
security = ADS
realm = XXX.XXX.XXX.XXX
encrypt passwords = yes
netbios name = newark
netbios aliases = newark
map to guest = bad user
dns proxy = no
log level = 1
log file = /var/log/samba/log.%m
max log size = 1000
keepalive = 0
local master = No
domain master = No
strict locking = no

[local_scratch]
follow symlinks = yes
wide links = yes
comment = “local data collection”
path = /local/scratch/
browseable = yes
guest ok = no
writable = yes
valid users = @cfygrp4
create mask = 764
directory mask = 775
force group = cfygrp4

# cat /etc/redhat-release
CentOS release 6.9 (Final)

# rpm -qa | grep -i samba | sort
samba-3.6.23-45.el6_9.x86_64
samba4-libs-4.2.10-12.el6_9.x86_64
samba-client-3.6.23-45.el6_9.x86_64
samba-common-3.6.23-45.el6_9.x86_64
samba-winbind-3.6.23-45.el6_9.x86_64
samba-winbind-clients-3.6.23-45.el6_9.x86_64

**dump of all options via testparm -vs**
# testparm -vs
Load smb config files from /etc/samba/smb.conf
rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
Processing section “[local_scratch]"
Loaded services file OK.
WARNING: You have some share names that are longer than 12 characters.
These may not be accessible to some older clients.
(Eg. Windows9x, WindowsMe, and smbclient prior to Samba 3.0.)
Server role: ROLE_DOMAIN_MEMBER
[global]
    dos charset = CP850
    unix charset = UTF-8
    display charset = LOCALE
    workgroup = XXX
    realm = XXX.XXX.XXX.XXX
    netbios name = NEWARK
    netbios aliases = newark
    netbios scope =
    server string = Samba Server %V
    interfaces =
    bind interfaces only = No
    security = ADS
    auth methods =
    encrypt passwords = Yes
    client schannel = Auto
    server schannel = Auto
    allow trusted domains = Yes
    map to guest = Bad User
    null passwords = No
    obey pam restrictions = No
    password server = *
    smb passwd file = /var/lib/samba/private/smbpasswd
    private dir = /var/lib/samba/private
    passdb backend = tdbsam
    algorithmic rid base = 1000
    root directory =
    guest account = nobody
    enable privileges = Yes
    pam password change = No
    passwd program =
    passwd chat = *new*password* %n\n *new*password* %n\n *changed*
    passwd chat debug = No
    passwd chat timeout = 2
    check password script =
    username map =
    password level = 0
    username level = 0
    unix password sync = No
    restrict anonymous = 0
    lanman auth = No
    ntlm auth = Yes
    raw NTLMv2 auth = No
    client NTLMv2 auth = Yes
    client lanman auth = No
    client plaintext auth = No
    client use spnego principal = No
    send spnego principal = No
    preload modules =
    dedicated keytab file =
    kerberos method = default
    map untrusted to domain = No
    log level = 2
    syslog = 1
    syslog only = No
    log file = /var/log/samba/log.%m
    max log size = 1000
    debug timestamp = Yes
    debug prefix timestamp = No
    debug hires timestamp = Yes
    debug pid = No
    debug uid = No
    debug class = No
    enable core files = Yes
    smb ports = 445 139
    large readwrite = Yes
    max protocol = NT1
    min protocol = CORE
    min receivefile size = 0
    read raw = Yes
    write raw = Yes
    disable netbios = No
    reset on zero vc = No
    log writeable files on exit = No
    acl compatibility = auto
    defer sharing violations = Yes
    nt pipe support = Yes
    nt status support = Yes
    announce version = 4.9
    announce as = NT
    max mux = 50
    max xmit = 16644
    name resolve order = lmhosts wins host bcast
    max ttl = 259200
    max wins ttl = 518400
    min wins ttl = 21600
    time server = No
    unix extensions = Yes
    allow dcerpc auth level connect = No
    use spnego = Yes
    client signing = required
    client ipc signing = required
    server signing = No
    client use spnego = Yes
    client ldap sasl wrapping = sign
    enable asu support = No
    svcctl list =
    deadtime = 0
    getwd cache = Yes
    keepalive = 0
    lpq cache time = 30
    max smbd processes = 0
    paranoid server security = Yes
    max disk size = 0
    max open files = 16384
    socket options = TCP_NODELAY
    use mmap = Yes
    hostname lookups = No
    name cache timeout = 660
    ctdbd socket =
    cluster addresses =
    clustering = No
    ctdb timeout = 0
    ctdb locktime warn threshold = 0
    smb2 max read = 65536
    smb2 max write = 65536
    smb2 max trans = 65536
    smb2 max credits = 8192
    load printers = Yes
    printcap cache time = 750
    printcap name =
    cups server =
    cups encrypt = No
    cups connection timeout = 30
    iprint server =
    disable spoolss = No
    addport command =
    enumports command =
    addprinter command =
    deleteprinter command =
    show add printer wizard = Yes
    os2 driver map =
    mangling method = hash2
    mangle prefix = 1
    max stat cache size = 256
    stat cache = Yes
    machine password timeout = 604800
    add user script =
    rename user script =
    delete user script =
    add group script =
    delete group script =
    add user to group script =
    delete user from group script =
    set primary group script =
    add machine script =
    shutdown script =
    abort shutdown script =
    username map script =
    username map cache time = 0
    logon script =
    logon path = \\%N\%U\profile
    logon drive =
    logon home = \\%N\%U
    domain logons = No
    init logon delayed hosts =
    init logon delay = 100
    os level = 20
    lm announce = Auto
    lm interval = 60
    preferred master = No
    local master = No
    domain master = No
    browse list = Yes
    enhanced browsing = Yes
    dns proxy = No
    wins proxy = No
    wins server =
    wins support = No
    wins hook =
    kernel oplocks = Yes
    lock spin time = 200
    oplock break wait time = 0
    ldap admin dn =
    ldap delete dn = No
    ldap group suffix =
    ldap idmap suffix =
    ldap machine suffix =
    ldap passwd sync = no
    ldap replication sleep = 1000
    ldap suffix =
    ldap ssl = start tls
    ldap ssl ads = No
    ldap deref = auto
    ldap follow referral = Auto
    ldap timeout = 15
    ldap connection timeout = 2
    ldap page size = 1024
    ldap user suffix =
    ldap debug level = 0
    ldap debug threshold = 10
    eventlog list =
    add share command =
    change share command =
    delete share command =
    preload =
    lock directory = /var/lib/samba
    state directory = /var/lib/samba
    cache directory = /var/lib/samba
    pid directory = /var/run
    utmp directory =
    wtmp directory =
    utmp = No
    default service =
    message command =
    get quota command =
    set quota command =
    remote announce =
    remote browse sync =
    socket address = 0.0.0.0
    nmbd bind explicit broadcast = Yes
    homedir map = auto.home
    afs username map =
    afs token lifetime = 604800
    log nt token command =
    time offset = 0
    NIS homedir = No
    registry shares = No
    usershare allow guests = No
    usershare max shares = 0
    usershare owner only = Yes
    usershare path = /var/lib/samba/usershares
    usershare prefix allow list =
    usershare prefix deny list =
    usershare template share =
    allow insecure wide links = No
    async smb echo handler = No
    multicast dns register = Yes
    panic action =
    perfcount module =
    host msdfs = Yes
    passdb expand explicit = No
    idmap backend = tdb
    idmap cache time = 604800
    idmap negative cache time = 120
    idmap uid =
    idmap gid =
    template homedir = /home/%D/%U
    template shell = /bin/false
    winbind separator = \
    winbind cache time = 300
    winbind reconnect delay = 30
    winbind max clients = 200
    winbind enum users = No
    winbind enum groups = No
    winbind use default domain = No
    winbind trusted domains only = No
    winbind nested groups = Yes
    winbind expand groups = 1
    winbind nss info = template
    winbind refresh tickets = No
    winbind offline logon = No
    winbind sealed pipes = Yes
    winbind normalize names = No
    winbind rpc only = No
    create krb5 conf = Yes
    ncalrpc dir = /var/ncalrpc
    winbind max domain connections = 1
    idmap config * : backend = tdb
    comment =
    path =
    username =
    invalid users =
    valid users =
    admin users =
    read list =
    write list =
    printer admin =
    force user =
    force group =
    read only = Yes
    acl check permissions = Yes
    acl group control = No
    acl map full control = Yes
    create mask = 0744
    force create mode = 00
    security mask = 0777
    force security mode = 00
    directory mask = 0755
    force directory mode = 00
    directory security mask = 0777
    force directory security mode = 00
    force unknown acl user = No
    inherit permissions = No
    inherit acls = No
    inherit owner = No
    guest only = No
    administrative share = No
    guest ok = No
    only user = No
    hosts allow =
    hosts deny =
    allocation roundup size = 1048576
    aio read size = 0
    aio write size = 0
    aio write behind =
    ea support = No
    nt acl support = Yes
    profile acls = No
    map acl inherit = No
    afs share = No
    smb encrypt = auto
    block size = 1024
    change notify = Yes
    directory name cache size = 100
    kernel change notify = Yes
    max connections = 0
    min print space = 0
    strict allocate = No
    strict sync = No
    sync always = No
    use sendfile = No
    write cache size = 0
    max reported print jobs = 0
    max print jobs = 1000
    printable = No
    print notify backchannel = Yes
    print ok = No
    printing = cups
    cups options =
    print command =
    lpq command = %p
    lprm command =
    lppause command =
    lpresume command =
    queuepause command =
    queueresume command =
    printer name =
    use client driver = No
    default devmode = Yes
    force printername = No
    printjob username = %U
    default case = lower
    case sensitive = Auto
    preserve case = Yes
    short preserve case = Yes
    mangling char = ~
    hide dot files = Yes
    hide special files = No
    hide unreadable = No
    hide unwriteable files = No
    delete veto files = No
    veto files =
    hide files =
    veto oplock files =
    map archive = Yes
    map hidden = No
    map system = No
    map readonly = yes
    mangled names = Yes
    store dos attributes = No
    dmapi support = No
    browseable = Yes
    access based share enum = No
    blocking locks = Yes
    csc policy = manual
    fake oplocks = No
    locking = Yes
    oplocks = Yes
    level2 oplocks = Yes
    oplock contention limit = 2
    posix locking = Yes
    strict locking = No
    share modes = Yes
    dfree cache time = 0
    dfree command =
    copy =
    preexec =
    preexec close = No
    postexec =
    root preexec =
    root preexec close = No
    root postexec =
    available = Yes
    volume =
    fstype = NTFS
    set directory = No
    wide links = No
    follow symlinks = Yes
    dont descend =
    magic script =
    magic output =
    delete readonly = No
    dos filemode = No
    dos filetimes = Yes
    dos filetime resolution = No
    fake directory create times = No
    vfs objects =
    msdfs root = No
    msdfs proxy =
--

Thanks in advance for your help!
-J

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