The only limitation I am aware of is actually the number of devices you can
support. With 3 devices required for a QDIO interface, and a maximum of 240
devices on one card, you can support up to 80 QDIO interfaces on one card.
They can all be in one LPAR, or shared among several LPARs. So if you are
running VM, (which I'm guessing you are since you're asking about how far
it can scale) you can attach 3 devices from the card to each of 80 Linux
guests and they can all own a piece of the card with their own IP address.
Jay Brenneman
Mark Kliner
<[EMAIL PROTECTED]> To: [EMAIL PROTECTED]
Sent by: Linux on cc:
390 Port Subject: OSA-Express Limitation
<[EMAIL PROTECTED]
IST.EDU>
07/22/02 04:15 PM
Please respond to
Linux on 390 Port
According to WSC Flash 10144, there is a limit on sharing an OSA-Express
running in QDIO mode.
The text of the Flash states that "There is a limit to the number of TCP/IP
stacks ...".
http://www-1.ibm.com/support/techdocs/atsmastr.nsf/PubAllNum/Flash10144
Does anyone know if this is a limit of TCP/IP instances or a limit of IP
addresses serviced by the shared OSA-Express?
In other words, does a multi-homed TCP/IP stack (z/VM in this case) count
as
one or as the number of IP addresses it services (z/VM plus Linux guests)?
Mark Kliner
Systems Programmer
Vision Service Plan
Rancho Cordova, CA
