Hi Brian,
I assume it wouldn't! But we're kind of stuck. Our networking guys are really worried that significant IPv6 traffic will destroy all they hold dear. To that end I'm trying to at least attempt to Macgyver something to stress the system in a controlled manner. And my only externally connected 10Gb servers are my perfsonar boxes and the storage nodes.
No precision is needed, we just need to pump as many IPv6 packets to and from our site as possible with an easy on/off switch. It would be easier if we could do this properly, but I promised I would see what could be done without dual stacking 3 dozen servers fronting 2PB of disk space and crossing my fingers.
As awkward as this is, it could well be a useful exercise to go through, IIRC Lancaster aren't the only site with networking teams nervous about opening the IPv6 floodgates. Having a recipe for testing things without dual stacking a whole SE could be useful.
Cheers,
Matt
________________________________________
From: [log in to unmask] [[log in to unmask]]
Sent: 07 March 2017 16:57
To: Doidge, Matthew; [log in to unmask]
Subject: RE: providing ipv6 at T2s; a cunning plan....
Matt, re Lancaster, not sure how having a storage system partially dual host will work. Is head node also dual hosted?
Brian
-----Original Message-----
From: Matt Doidge [mailto:[log in to unmask]]
Sent: 07 March 2017 16:49
To: Davies, Brian (STFC,RAL,SC); [log in to unmask]
Subject: Re: providing ipv6 at T2s; a cunning plan....
Hi Brian,
Lancaster is in the middle of a stage rollout of Ipv6 to its storage nodes. We currently have 4 10Gb pools dual stacked (stor0[19-22].hec.lancs.ac.uk).
Why only 4? Because our networking guys would like us to stress test in a controlled manner what happens when we start throwing about a lot of
v6 traffic (i.e. see if we can cap out our 10Gb bandwidth for a bit with
Ipv6 traffic and see if anything melts).
Between these 4 nodes and the perfsonar boxes we should be able to do this - if we have a "target" (or two) - i.e. a couple of 10Gb boxes with Iperf at a site that we could throw tests at and receive tests from.
Sadly I'm not sure I'll be back from a trip to the vets in time tomorrow to get to the meeting to discuss this, but if anyone wants to volunteer to help that would be great (especially if this would help you test your own IPv6 pipes as well).
Cheers,
Matt
On 07/03/17 16:32, Brian Davies wrote:
> So If I were to order the remaining sites for priority for ipv6 (for
> storage ) I would put me as follows.
>
> I have split them into two groups ( dependent on size, number of VOS
> supported and Importance within the scheme of their supported VOs).
>
>
>
> RALPP
>
> Glasgow
>
> Manchester
>
> Birmingham
>
>
>
> Lancaster
>
> ECDF
>
> Liverpool
>
> RHUL
>
>
>
> And then remaining sites
>
>
>
> Timescale for when they need/should/requested/required is up for
> debate…. But in terms of prioritisation order that we ( the storage
> group) should care about does this make sense?
>
>
>
> Brian
>
>
>
>
>
> *From:*GRIDPP2: Deployment and support of SRM and local storage
> management [mailto:[log in to unmask]] *On Behalf Of *L
> Kreczko
> *Sent:* 01 March 2017 16:31
> *To:* [log in to unmask]
> *Subject:* Re: providing ipv6 at T2s; a cunning plan....
>
>
>
> Same in Bristol, but we have still some teething problems as IPv6 is
> low
> prio:
>
> https://ggus.eu/index.php?mode=ticket_info&ticket_id=126865
>
>
>
>
>
>
>
> On 1 March 2017 at 16:07, Raul Lopes <[log in to unmask]
> <mailto:[log in to unmask]>> wrote:
>
> Brunel storage is DPM and has been on dual-stack for 2+ years.
>
> raul
>
> Brian Davies wrote:
>
>> Is it a stupid idea to consider that a cunning way to provide ipv6
> data access to storage at T2s is to dual host webdav interfaces?
>> Does this work for DPM/dCache/Storm ?
>> Would this be enough for the VOs?
>> Brian
>
>
>
>
>
> --
>
> *********************************************************
> *Dr Lukasz Kreczko
> Research Associate*
>
> * Department of Physics*
>
> * Particle Physics Group
> *
> University of Bristol
> HH Wills Physics Lab
> University of Bristol
> Tyndall Avenue
> Bristol
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>
> +44 (0)117 928 8724
>
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