Re: [Xen-users] what do you recommend for cluster fs ??

[Luke Crawford <lsc@xxxxxxxxx>]

If you are going through the trouble of a second network, wouldn't using 
1Gbit fibre make more sense?  1gbt fibre-channel is actually cheaper than 
gigabit Ethernet, assuming you are buying name-brand equipment, 
comparing used to used,  and for disk use, fibre-channel is much faster 
than going over the network.  It also has basic disk 
organization/pesudo-security built in already.
I use pci-x qlogic 2200 cards (around $10 per)  and Brocade silworm 2800 
switches (around $100/each)  along with whatever fibre arrays I can find 
(I have a IBM EXP-500 right now-  Nice!  but it was $250. 
You can get used dell/EMC 10 bay half-height arrays for little more than 
shipping; but that's 'cause they are flimsy crap.  After getting it 
shipped with drives in it, you will have bad/flaky slots.    I just 
ordered a Sun StorEdge A5200 for around $150, but those are low-profile, 
and the half-height drives are extremely cheap-  you can get 10KRPM 
half-height 73G drives for around $10/each.  that goes up to $50 or so 
for the low-profile drives of the same spec, and you only get a 30% 
density improvement.)

On Mon, 25 Sep 2006, Tom Mornini wrote:

> Date: Mon, 25 Sep 2006 10:59:39 -0700
> From: Tom Mornini <tmornini@xxxxxxxxxxxxxx>
> To: Xen Users <Xen-users@xxxxxxxxxxxxxxxxxxx>
> Cc: Martin Hierling <martin@xxxxxxxxx>
> Subject: Re: [Xen-users] what do you recommend for cluster fs ??
>
> On Sep 25, 2006, at 10:00 AM, Ceri Storey wrote:
>
> > On Mon, Sep 25, 2006 at 09:52:19AM -0700, Tom Mornini wrote:
> > > On Sep 25, 2006, at 8:09 AM, Martin Hierling wrote:
> > >
> > > > setup is easy (about 1h) but my test szenario was: P3-1GHz with
> > > > Dom0 as iSCSI Target and 3 DomU as ocfs2 "clients" mounting the
> > > > same FS over open-iscsi. That works out of the box but under heavy
> > > > load the Clients get kicked by the heardbeat. That obviously was
> > > > because the complete network was fuff of iscsi traffic (bonnie). I
> > > > will test that in a real environment in about 2 weeks. will reoport
> > > > here.
> > > You might get better performance and leave this problem behind with
> > > AoE as it's much less demanding under very high loads.
> > I must admit that it sounds like you're running your frontend and
> > backend networks on the same LAN.
> >
> > It's probably wise to use a dedicated network for storage network
> > traffic, because as you've seen, it can quite easily saturate the link,
> > causing performance issues.
> >
> > It's also entirely possible that moving the storage onto a dedicated
> > network would bring security benefits, assuming you've taken proper
> > precautions (there's no need for it to have access / be accessible from
> > the internet).
> These are all excellent points. We have separate IP and AoE networks.
>
> --
> -- Tom Mornini
>
>
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