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[Samba] Server-Side Copy Offload Limitations




Hello,

Server-Side Copy Offload wiki page states in Limitations section that

   - Both source and destination files must reside on the same Samba share!

I was able to copy file between different shares located on the same zfs
Pool without generating network traffic. Shares were created on Debian 8
with zfs filesystem and client was Windows Server 2016 machine mapping
shares as separate drives. Is it new functionality or I'm misunderstanding
something about server-side copy?

Samba version 4.7.3

testparm -vvvv
Load smb config files from /etc/samba/smb.conf
rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
Processing section "[share1]"
Processing section "[share2]"
Loaded services file OK.
'winbind separator = +' might cause problems with group membership.

Server role: ROLE_STANDALONE

Press enter to see a dump of your service definitions

# Global parameters
[global]
abort shutdown script =
add group script =
add machine script =
addport command =
addprinter command =
add share command =
add user script =
add user to group script =
afs token lifetime = 604800
afs username map =
aio max threads = 100
algorithmic rid base = 1000
allow dcerpc auth level connect = No
allow dns updates = secure only
allow insecure wide links = No
allow nt4 crypto = No
allow trusted domains = Yes
allow unsafe cluster upgrade = No
async smb echo handler = No
auth event notification = No
auth methods =
auto services =
bind interfaces only = No
browse list = Yes
cache directory = /var/cache/samba
change notify = Yes
change share command =
check password script =
cldap port = 389
client ipc max protocol = default
client ipc min protocol = default
client ipc signing = default
client lanman auth = No
client ldap sasl wrapping = sign
client max protocol = default
client min protocol = CORE
client NTLMv2 auth = Yes
client plaintext auth = No
client schannel = Auto
client signing = default
client use spnego principal = No
client use spnego = Yes
cluster addresses =
clustering = No
config backend = file
config file =
create krb5 conf = Yes
ctdbd socket =
ctdb locktime warn threshold = 0
ctdb timeout = 0
cups connection timeout = 30
cups encrypt = No
cups server =
dcerpc endpoint servers = epmapper, wkssvc, rpcecho, samr, netlogon,
lsarpc, drsuapi, dssetup, unixinfo, browser, eventlog6, backupkey, dnsserver
deadtime = 0
debug class = No
debug hires timestamp = Yes
debug pid = No
debug prefix timestamp = No
debug uid = No
dedicated keytab file =
default service =
defer sharing violations = Yes
delete group script =
deleteprinter command =
delete share command =
delete user from group script =
delete user script =
dgram port = 138
disable netbios = No
disable spoolss = No
dns forwarder =
dns proxy = Yes
dns update command = /usr/sbin/samba_dnsupdate
domain logons = Yes
domain master = No
dos charset = CP850
enable asu support = No
enable core files = Yes
enable privileges = Yes
encrypt passwords = Yes
enhanced browsing = Yes
enumports command =
eventlog list =
get quota command =
getwd cache = Yes
guest account = nobody
homedir map = auto.home
host msdfs = Yes
hostname lookups = No
idmap backend = tdb
idmap cache time = 604800
idmap gid =
idmap negative cache time = 120
idmap uid =
include system krb5 conf = Yes
init logon delay = 100
init logon delayed hosts =
interfaces =
iprint server =
keepalive = 300
kerberos encryption types = all
kerberos method = default
kernel change notify = Yes
kpasswd port = 464
krb5 port = 88
lanman auth = No
large readwrite = Yes
ldap admin dn =
ldap connection timeout = 2
ldap debug level = 0
ldap debug threshold = 10
ldap delete dn = No
ldap deref = auto
ldap follow referral = Auto
ldap group suffix =
ldap idmap suffix =
ldap machine suffix =
ldap page size = 1000
ldap passwd sync = no
ldap replication sleep = 1000
ldap server require strong auth = Yes
ldap ssl = start tls
ldap ssl ads = No
ldap suffix =
ldap timeout = 15
ldap user suffix =
lm announce = Auto
lm interval = 60
load printers = Yes
local master = No
lock directory = /var/run/samba
lock spin time = 200
log file = /var/log/samba/log.%m
logging =
log level = 2
log nt token command =
logon drive =
logon home = \\%N\%U
logon path = \\%N\%U\profile
logon script =
log writeable files on exit = No
lpq cache time = 30
lsa over netlogon = No
machine password timeout = 604800
mangle prefix = 1
mangling method = hash2
map to guest = Bad User
map untrusted to domain = Auto
max disk size = 0
max log size = 6000
max mux = 50
max open files = 16384
max smbd processes = 0
max stat cache size = 256
max ttl = 259200
max wins ttl = 518400
max xmit = 16644
message command =
min receivefile size = 0
min wins ttl = 21600
mit kdc command =
multicast dns register = Yes
name cache timeout = 660
name resolve order = lmhosts wins host bcast
nbt client socket address = 0.0.0.0
nbt port = 137
ncalrpc dir = /var/run/samba/ncalrpc
netbios aliases =
netbios name = NODE-57B37C3F
netbios scope =
neutralize nt4 emulation = No
NIS homedir = No
nmbd bind explicit broadcast = Yes
nsupdate command = /usr/bin/nsupdate -g
ntlm auth = ntlmv2-only
nt pipe support = Yes
ntp signd socket directory = /var/lib/samba/ntp_signd
nt status support = Yes
null passwords = No
obey pam restrictions = No
old password allowed period = 60
oplock break wait time = 0
os2 driver map =
os level = 0
pam password change = No
panic action =
passdb backend = tdbsam
passdb expand explicit = No
passwd chat = *new*password* %n\n *new*password* %n\n *changed*
passwd chat debug = No
passwd chat timeout = 2
passwd program =
password hash gpg key ids =
password hash userPassword schemes =
password server = *
perfcount module =
pid directory = /var/run/samba
preferred master = No
preload modules =
printcap cache time = 0
printcap name =
private dir = /var/lib/samba/private
raw NTLMv2 auth = No
read raw = Yes
realm =
registry shares = No
reject md5 clients = No
reject md5 servers = No
remote announce =
remote browse sync =
rename user script =
require strong key = Yes
reset on zero vc = No
restrict anonymous = 0
rndc command = /usr/sbin/rndc
root directory =
rpc big endian = No
rpc server dynamic port range = 49152-65535
rpc server port = 0
samba kcc command = /usr/sbin/samba_kcc
security = USER
server max protocol = SMB3
server min protocol = LANMAN1
server multi channel support = No
server role = standalone server
server schannel = Auto
server services = s3fs, rpc, nbt, wrepl, ldap, cldap, kdc, drepl, winbindd,
ntp_signd, kcc, dnsupdate, dns
server signing = default
server string = TestServer
set primary group script =
set quota command =
share backend = classic
show add printer wizard = Yes
shutdown script =
smb2 leases = No
smb2 max credits = 8192
smb2 max read = 8388608
smb2 max trans = 8388608
smb2 max write = 8388608
smbd profiling level = off
smb passwd file = /var/lib/samba/private/smbpasswd
smb ports = 445 139
socket options = TCP_NODELAY IPTOS_LOWDELAY
spn update command = /usr/sbin/samba_spnupdate
stat cache = Yes
state directory = /var/lib/samba
svcctl list =
syslog = 1
syslog only = No
template homedir = /home/%D/%U
template shell = /bin/false
time server = No
timestamp logs = Yes
tls cafile = tls/ca.pem
tls certfile = tls/cert.pem
tls crlfile =
tls dh params file =
tls enabled = Yes
tls keyfile = tls/key.pem
tls priority = NORMAL:-VERS-SSL3.0
tls verify peer = as_strict_as_possible
unicode = Yes
unix charset = UTF-8
unix extensions = No
unix password sync = No
use mmap = Yes
username level = 0
username map =
username map cache time = 0
username map script =
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 =
use spnego = Yes
utmp = No
utmp directory =
web port = 901
winbind cache time = 300
winbindd socket directory = /var/run/samba/winbindd
winbind enum groups = Yes
winbind enum users = Yes
winbind expand groups = 1
winbind max clients = 200
winbind max domain connections = 1
winbind nested groups = Yes
winbind normalize names = No
winbind nss info = template
winbind offline logon = No
winbind reconnect delay = 30
winbind refresh tickets = Yes
winbind request timeout = 200
winbind rpc only = No
winbind sealed pipes = Yes
winbind separator = +
winbind trusted domains only = No
winbind use default domain = No
wins hook =
wins proxy = No
wins server =
wins support = No
workgroup = WORKGROUP
write raw = Yes
wtmp directory =
idmap config * : rangesize = 1000000
idmap config * : range = 1000000-19999999
fruit:encoding = native
fruit:locking = netatalk
fruit:metadata = netatalk
fruit:resource = file
shadow: localtime = yes
shadow: format = autosnap_%Y-%m-%d-%H%M%S
shadow: sort = desc
shadow: snapdir = .zfs/snapshot
fileid:mapping = fsid
idmap config * : backend = autorid
access based share enum = No
acl allow execute always = No
acl check permissions = Yes
acl group control = No
acl map full control = Yes
administrative share = No
admin users =
afs share = No
aio read size = 0
aio write behind =
aio write size = 0
allocation roundup size = 1048576
available = Yes
blocking locks = Yes
block size = 1024
browseable = Yes
case sensitive = Auto
comment =
copy =
create mask = 0777
csc policy = manual
cups options =
default case = lower
default devmode = Yes
delete readonly = No
delete veto files = No
dfree cache time = 0
dfree command =
directory mask = 0777
directory name cache size = 100
dmapi support = No
dont descend =
dos filemode = No
dos filetime resolution = No
dos filetimes = Yes
durable handles = Yes
ea support = No
fake directory create times = No
fake oplocks = No
follow symlinks = Yes
force create mode = 0000
force directory mode = 0000
force group =
force printername = No
force unknown acl user = Yes
force user =
fstype = NTFS
guest ok = No
guest only = No
hide dot files = Yes
hide files =
hide special files = No
hide unreadable = No
hide unwriteable files = No
hosts allow =
hosts deny =
inherit acls = No
inherit owner = no
inherit permissions = No
invalid users = root
kernel oplocks = No
kernel share modes = Yes
level2 oplocks = Yes
locking = Yes
lppause command =
lpq command = lpq -P'%p'
lpresume command =
lprm command = lprm -P'%p' %j
magic output =
magic script =
mangled names = yes
mangling char = ~
map acl inherit = No
map archive = Yes
map hidden = No
map readonly = yes
map system = No
max connections = 0
max print jobs = 1000
max reported print jobs = 0
min print space = 0
msdfs proxy =
msdfs root = No
msdfs shuffle referrals = No
nt acl support = Yes
ntvfs handler = unixuid, default
oplock contention limit = 2
oplocks = Yes
path =
posix locking = Yes
postexec =
preexec =
preexec close = No
preserve case = Yes
printable = No
print command = lpr -r -P'%p' %s
printer name =
printing = bsd
printjob username = %U
print notify backchannel = No
profile acls = No
queuepause command =
queueresume command =
read list =
read only = Yes
root postexec =
root preexec =
root preexec close = No
short preserve case = Yes
smb encrypt = default
spotlight = No
store dos attributes = No
strict allocate = No
strict locking = Auto
strict rename = No
strict sync = Yes
sync always = No
use client driver = No
use sendfile = No
valid users =
veto files =
/.nfs/._.DS_Store/:2eFBCLockFolder/.FBCLockFolder/:2eFBCIndex/.FBCIndex/:2eDS_Store/.DS_Store/TheVolumeSettingsFolder/TheFindByContentFolder/Temporary
Items/Network Trash
Folder/.AppleDB/:2eVolumeIcon.icns/.VolumeIcon.icns/Icon?/.Ap$
veto oplock files =
vfs objects = acl_xattr shadow_copy2 fileid
volume =
wide links = No
write cache size = 0
write list =


[share1]
case sensitive = No
guest ok = Yes
guest only = Yes
inherit permissions = Yes
path = /P0/dataset1
read only = No


[share2]
case sensitive = No
guest ok = Yes
guest only = Yes
inherit permissions = Yes
path = /P0/dataset2
read only = No
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