Re: [Xen-users] Re: I need advice about xen project

[Peter Booth <peter_booth@xxxxxx>]

Aleix,

For the servers running over ten domU, have you seen any issues with  
unexpected latencies or domU sar showing %steal above 1?
Are any of these domU running web services or web applications?

Sent from my iPhone

On Aug 23, 2009, at 3:14 PM, Aleix Dorca <adorca@xxxxxx> wrote:

> Hi Christopher,
>
> no, I don't limit to 4 the domU's on my Xen machines, I have plenty  
> of servers to spare. I have some servers running 10-12 domU's while  
> others only run 1-2. Some none, I have them just in case... or for  
> when new domU's needed. I have not run out of processing power but I  
> have of RAM. If I had to recommend something that'd be: GET PLENTY  
> OF RAM.
> As for drbd, yes, I'm running an active/passive setup. You could say  
> a machine is always misused, it's true, but I have an 'on-line'  
> backup just in case. You could always use an active/active setup  
> with a cluster aware file system. I tried it but I really didn't  
> need it.
> Hope it helps,
>
> Al.
>
> En/na christopher andrews ha escrit:
> > Hey Aleix,
> > I notice here that you have 12 dell server running xen for your  
> > domU's, so
> > does this mean your limit to 4 vm per dom0? This going out the fact  
> > that you
> > have 30 to 40 domU's running in total from your first e-mail. Also  
> > I see
> > that you using drbd for you iscsi san on the dell 2950's, I'm also  
> > thing
> > about using this setup but I'm wonder are they 2950 running passive  
> > active
> > mode because I believe that drdb can only have one device accessing  
> > the
> > virtual disk interface at a time.
> >
> > Thank You,
> > Chris
> >
> >
> > On 8/23/09 8:08 AM, "Aleix Dorca" <adorca@xxxxxx> wrote:
> >
> >
> > > > Hello,
> > > >
> > > > I need help with a production system that I would like to design  
> > > > and
> > > > roll
> > > > out a my job. I was thinking about buy two server with 16 each  
> > > > and 8
> > > > processor and have both server connect to two dell 2850 server with
> > > > raid 6
> > > > and 3x 300 ultra 320 hard drives. Both dell 2850Âs that are being
> > > > used a
> > > > nas server will be connected to the two new server through 1gigabit
> > > > Ethernet. I wonder if this a bad Idea?
> > > Hi Christopher,
> > >
> > > the setup you talk about is more or less the same I'm using. I've  
> > > been
> > > using it in a production environment for about a year now without a
> > > single problem. Here's my setup:
> > >
> > > 12 Dell 1950 Servers with 8 Cores and 4 to 16 Gb (depending on the
> > > server)
> > > 4 Dell 2950 Servers with 5 450Gb disks on RAID 5 acting as a SAN via
> > > iscsi (2TB aprox each).
> > >
> > > The SAN servers are paired and replicated using drbd.
> > >
> > > As said no problems running xen 3.1 on Ubuntu and Debian DomU, and
> > > running Debian and CentOS as domU.
> > >
> > > All network connections are 1 Gb. I have about 30~40 domU.
> > >
> > > Hope it helps,
> > >
> > > Al.
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-users
>
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