[CentOS-virt] Thoughts on storage infrastructure for small scale HA virtual machine deployments

Wed Mar 3 16:29:39 UTC 2010
Grant McWilliams <grantmasterflash at gmail.com>

> > If all the 40 VMs start copying files at the same time that would mean
> > that the bandwidth share for each VM would be tiny.
> Would they? It's a possibility, and fun to think about, but what are the
chances? You will usually run into this with backups, cron, and  other
scheduled [non-business load] tasks. These are far cheaper to fix with
manually adjusting schedules than any other way, unless you are rolling in

I have a classroom environment where every VM is always doing the same thing
in step ie. formatting partitions, installing software etc.. We hit the disk
like a bunch of crazy people. I'm replacing my setup with three  Intel SSDs
in a RAID0 with either iSCSI or ATAoE. The RAID0 will be synced to a disk
based storage as backup. We'll see pretty soon how many concurrent disk
based operations this setup can handle.

I'll be bonding 3 or 4 of  the iSCSI box ethernet cards and then going from
there to see what each of the servers in the cloud needs as far as their

Grant McWilliams

Some people, when confronted with a problem, think "I know, I'll use
Now they have two problems.
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