Hi Ivor,
On Saturday 07 May 2011 10:00:00 [email protected] wrote:
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> 1. Re: Jumbo Frames (Ivar Janmaat)
>
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Fri, 06 May 2011 13:47:53 +0200
> From: Ivar Janmaat <[email protected]>
> To: SunRay-Users mailing list <[email protected]>
> Subject: Re: [SunRay-Users] Jumbo Frames
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Just wondering.
> If the SRSS server has jumbo frames configured on the network interface
> will that hurt the ALP protocol somehow?
I have not noticed any degrading performance issues.
> Since the SRSS only sends out packets with max 1500 MTU i would think
> that it should not make any difference for the ALP protocol to have
> jumbo frames on or off.
> Or does it?
>
> I am asking because I am looking into a setup where the SRSS and the
> Virtualbox server are on the same hardware.
This is exactly the set up I have with two aggregated links directly going
into Cisco 48 port GB switch with 2 trunk ports to provide 2GB link.
aggr1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 16298 index 2
inet x.x.x.x netmask fffffe00 broadcast x.x.x.x
ether 0:14:4f:eb:1f:e4
That's where the similarity ends, however. The nfs linux server connected to
the same switch could have benefited from link aggregation or bonding as well.
Unfortunately hardware is too old. I have noticed NFS performance improvement
on Linux virtual clients using jumbo and aggregation.
We don't have an iscsi kit to use. Our Windows VM's are mostly for users to
open an occasional document ala *.docx. :-) and they mount $HOME from the same
nfs server via samba. The difference in performance is slightly in favour of
Linux VM's. If I could I would use the third interface on x4600 M2 as well for
the link. Unfortunately our ZFS store is running off a Coraid device and the
interface is taken for ATAoE.
Having all the bits of infrastructure
on the same switch improved the performance overall.
The best results for ALP on SunRay 2 here is when SunRay device has to go
through the VLAN stacks of 100MB switches and connection drops to 100MB,
which us understandable given the hardware.
> The Windows VMs on this machine connect to an iscsi network storage.
> So I can only aggregate all the onboard network interfaces as one trunk
> if I can switch on Jumbo frames on it which i need for the iscsi.
>
> Kind regards,
Best wishes,
Alex
>
> Ivar
>
> Kent Peacock schreef:
> > On 12/16/09 07:10 AM, Detlev Habicht wrote:
> >> But i can enable Jumbo Frames on 100MB ports on the switch ...
> >>
> >> So, the SunRays will do it too???
> >
> > No. The maximum MTU supported is 1500 bytes.
> >
> > Kent
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> End of SunRay-Users Digest, Vol 88, Issue 7
> *******************************************
>
--
=======================================
Alex Brulo
Senior Server Engineer (HPC)
Information Systems Aston (ISA)
Aston University, Aston Triangle,
Birmingham, B4 7ET
Tel: 0121 204 3673
ISA "Aiming for Excellence in ICT Services"
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