Re: [Xen-users] Optimizing I/O

["lists@xxxxxxxxxxxx" <lists@xxxxxxxxxxxx>]

> What I'm doing is have all webservers on DomU's off an iSCSI array and
> have the databases in separate DomU's running off the servers' local
> disks.
> This keeps the performance of the databases predictable, latency low
> and takes a big chunk of IO out of the iSCSI.

This is an area where I am having conflicting thoughts.
In testing, I've found that the only real way of serving LAMP services is 
distributed stand alone servers rather than on shared environments such as 
virtual servers. The speed differences are instantly obvious when connecting to 
a VM based server compared to stand alone.

The cost is a bit higher but who wants to suffer slowness on LAMP services?

It seems to me that the best machines to virtualize are only machines which 
aren't required in such a demanding role as web/mysql servers are. Maybe I'm 
missing something.

Mike


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