[Samba] smb2 vs. NT1

Papp Tamas tompos at martos.bme.hu
Mon Feb 25 01:38:51 MST 2013

hi All,

We have a glusterfs cluster with 5 nodes on Ubuntu 12.04 amd64.
We use this smb.conf:

	read raw = yes
	server string = %h
	write raw = yes
	#oplocks = yes
	max xmit = 131072
	dead time = 15
	getwd cache = yes
	use sendfile=yes
	block size = 131072
	load printers = no
	aio read size = 16384
	aio write size = 16384
	aio write behind = /*.*/
	wins support = no
	local master = no
	wins server =
	veto files = /.AppleDouble/
	delete veto files = yes
	hide dot files = yes
	printing = BSD
	max protocol = SMB2
	min protocol = SMB2

	path = /W/Projects
	browseable = yes
	public = yes
	guest ok = yes
	read only = no
	force user = user
	force group = user

The speed is fine with this configuration, around 100Mbyte/s. If I change protocol to NT1, the speed 
drops to around 50Mbyte/s.

This is from man page:

NT1: Current up to date version of the protocol. Used by Windows NT. Known as CIFS.
SMB2: Re-implementation of the SMB protocol. Used by Windows Vista and newer. The Samba 
implementation of SMB2 is currently marked experimental!

Why is it still experimental? What does it mean exactly? Is there anything I should avoid it, like 
file corruption or so?
Why NT1 is _much_ slower then SMB2?

Thank you,

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