[Xen-users] Recommendations setting up shared storage for a build-farm for our software

[Ron Arts <ron.arts@xxxxxxxx>]

Hello,

I am trying to setup an XCP based buildfarm for our software.
It should build packages for various environments, bith 32 and 64 bits
For now we need 27 VM's of about 10Gbyte disksize each, they need 256MB for
the 32 bits VM's and 512MB for the 64 bit.
For the XCP-setup itself I have 6 Quad-Core 8GB servers available.
All network adapters are 1Gbit. And we are a CentOS shop.

My question is about the Shared Storage. I have at my disposal one Quad-Core 
server,
with 4GB RAM, and 12 x 1TB SATA disks on a 3-Ware 9500S 12 ports controller.

We will totally need 3 TB for the VM's and the Shared Storage combined.

How do I make the most efficient use of this storage? I am contemplating NFS 
and iSCSI
(and leaning towards the latter, because I did some tests, and iSCSI was 
faster).
Because of the continuous compilation we need short seek times, so I think 
striping
is important.

So do I create one big striped RAID-1/10 disk on the 3-Ware of say 3 TB, and 
hand that
as one iSCSI LUN to XCP, or do I create 6 separate Raid-1 disks, and give that 
to
XCP, and let it make a LVM out of that? Or am I better off separating the 
Shared Storage
for the VM's and the compilation drives to different halves of the array?

I am aware this is not an easy question, but I'd appreciate any pointers and 
insights.

Thanks,
Ron Arts

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