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

[Aleix Dorca <adorca@xxxxxx>]

Christopher,

I don't know if there's a best way to do it. :-)

The way I did it is: I set up three partitions on 2950 servers. 1 for  
the OS, 1 for swap, and 1 for drbd (in my case /dev/sda3). This on  
both servers replicating. Once drbd configured I use LVM on top of it,  
creating "logical volumes" as needed.
I can snapshot any LV any time and all actions are replicated on the  
other drbd machine. There's plenty of tutorials dealing with this  
particular setup. Others, depending on their necessities prefer to  
have drbd on top of LVM... it also works...
Al.


El 24/08/2009, a las 6:52, christopher andrews escribió:

> Hey Aleix,
>
> What would be the best way to setup drdb with lvm and still be able  
> to take
> lvm snapshoot for backups.
>
>
> On 8/23/09 9:38 PM, "Aleix Dorca" <adorca@xxxxxx> wrote:
>
> > Hi Peter,
> >
> > sorry to tell you I've never run into performance problems that lead
> > me to run sar and check steal percentages. Also, I'd have to say that
> > my VMs don't work to hard most of the time... maybe this helps avoid
> > latencies.
> >
> > The VMs run everything from Active Directory, Exchange, MSSQL (on
> > Windows 2003 HVM), mysql, apache, tomcat, squid... you name it.
> >
> > Aleix.
> >
> > El 23/08/2009, a las 21:34, Peter Booth escribió:
> >
> > > 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 2850’s 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.
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