[Lustre-discuss] IB storage as an OST target

[chas williams - CONTRACTOR]

On Tue, 29 Mar 2011 09:23:59 -0400
Jason Hill <hilljj at ornl.gov> wrote:

> On Mon, Mar 28, 2011 at 09:36:43AM -0400, Jason Hill wrote:
> storage as well. I would definately suggest putting your LNET and SRP 
> connections on different physical HCA's to keep the traffic at least isolated 
> on the OSS side. 

i doubt this matters as much as it once did.  pci/pci-x wasnt capacble
of reading/writing at the same time due to its bus nature (even though
pci-x was point-to-point to the bridge chip).  pci-express (and
infiniband) can both read and write at the same time.  so you can
stream in data from srp and stream it out via lnet at the same time on
the same port.

a bigger concern might be the number of luns behind a single port on
your storage controller.  most people have more ost's/oss's than ports
on the storage controllers.