Mode 2 will do the job the best way for you in case of static LAG = supported only at the switch's side, I'd advise using of = xmit_hash_policy layer3+4, so you'll get better distribution for your = DC. =20 =20 Thanks in advance. =20 Best regards, Nikolai ____________________ Nikolai Sednev Senior Quality Engineer at Compute team Red Hat Israel 34 Jerusalem Road, Ra'anana, Israel 43501 =20 Tel: +972 9 7692043 Mobile: +972 52 7342734 Email: nsednev@redhat.com IRC: nsednev =20 From: users-request@ovirt.org To: users@ovirt.org Sent: Tuesday, December 30, 2014 2:12:58 AM Subject: Users Digest, Vol 39, Issue 173 =20 Send Users mailing list submissions to users@ovirt.org =20 To subscribe or unsubscribe via the World Wide Web, visit http://lists.ovirt.org/mailman/listinfo/users or, via email, send a message with subject or body 'help' to users-request@ovirt.org =20 You can reach the person managing the list at users-owner@ovirt.org =20 When replying, please edit your Subject line so it is more specific than "Re: Contents of Users digest..." =20 =20 Today's Topics: =20 1. Re: ??: bond mode balance-alb (Jorick Astrego) 2. Re: ??: bond mode balance-alb (Jorick Astrego) 3. HostedEngine Deployment Woes (Mikola Rose) =20 =20 ---------------------------------------------------------------------- =20 Message: 1 Date: Mon, 29 Dec 2014 20:13:40 +0100 From: Jorick Astrego <j.astrego@netbulae.eu> To: users@ovirt.org Subject: Re: [ovirt-users] ??: bond mode balance-alb Message-ID: <54A1A7E4.90308@netbulae.eu> Content-Type: text/plain; charset=3D"utf-8" =20 =20 On 12/29/2014 12:56 AM, Dan Kenigsberg wrote:
On Fri, Dec 26, 2014 at 12:39:45PM -0600, Blaster wrote:
On 12/23/2014 2:55 AM, Dan Kenigsberg wrote:
Bug 1094842 - Bonding modes 0, 5 and 6 should be avoided for VM = networks https://bugzilla.redhat.com/show_bug.cgi?id=3D1094842#c0 Dan,
What is bad about these modes that oVirt can't use them? I can only quote jpirko's workds from the link above:
Do not use tlb or alb in bridge, never! It does not work, that's = it. The reason is it mangles source macs in xmit frames and arps. When it is =
--Apple-Mail=_DA2D4197-7D78-42A9-87F6-96CF58AF637C Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Thanks for your thoughts. The problem is, most of the data is = transmitted from a couple apps to a couple systems. The chance of a = hash collision (i.e., most of the data going out the same interface = anyway) is quite high. On Solaris, I just created two physical = interfaces each with their own IP, and bound the apps to the appropriate = interfaces. This worked great. Imagine my surprise when I discovered = this doesn=92t work on Linux and my crash course on weak host models. Interesting that no one commented on my thought to just do the bonding = at the guest level (and use balance-alb) instead of at the hypervisor = level. Some ESXi experts I have talked to say this is actually the = preferred method with ESXi and not to do it at the hypervisor level, as = the VM knows better than VMware. Or is the bonding mode issue with balance-alb/tlb more with the Linux = TCP stack itself and not with oVirt and VDSM? On Dec 30, 2014, at 4:34 AM, Nikolai Sednev <nsednev@redhat.com> wrote: possible, just
use mode 4 (lacp). That should be always possible because all =
enterprise
switches support that. Generally, for 99% of use cases, you =
*should* use mode
4. There is no reason to use other modes.
This switch is more of an office switch and only supports part of the 802.3ad standard: =20 =20 PowerConnect* *2824 =20 Scalable from small workgroups to dense access solutions, the 2824 offers 24-port flexibility plus two combo small?form?factor pluggable (SFP) ports for connecting the switch to other = networking equipment located beyond the 100 m distance limitations of copper cabling. =20 Industry-standard link aggregation adhering to IEEE 802.3ad standards (static support only, LACP not supported) =20 =20 So the only way to have some kind of bonding without buying more expensive switches, is using balance-rr (mode=3D0), balance-xor = (mode=3D2) or broadcast (modes=3D3).
I just tested mode 4, and the LACP with Fedora 20 appears to not be compatible with the LAG mode on my Dell 2824.
Would there be any issues with bringing two NICS into the VM and = doing balance-alb at the guest level?
Kind regards, =20 Jorick Astrego =20 =20 =20 Met vriendelijke groet, With kind regards, =20 Jorick Astrego =20 Netbulae Virtualization Experts=20 =20
=20 Tel: 053 20 30 270 info@netbulae.eu = Staalsteden 4-3A KvK 08198180 Fax: 053 20 30 271 www.netbulae.eu 7547 TA = Enschede BTW NL821234584B01 =20 ---------------- =20