The number should be set to the number of FCP subchannels you expect to
divy out to different Linux guests and VM EDEVICE definitions (plus some
extras). If you don't know, just set it to the max supported for the
CHPID; that should be either 240 or 480 depending on your adapter card
level.
Regards, Steve.
Steve Wilkins
IBM z/VM Development
"Neubert, Kevin
(DIS)"
<[EMAIL PROTECTED] To
V> [email protected]
Sent by: The IBM cc
z/VM Operating
System Subject
<[EMAIL PROTECTED] Re: HCD FCP IODEVICE ADDRESSes
ARK.EDU>
05/21/2007 01:57
PM
Please respond to
The IBM z/VM
Operating System
<[EMAIL PROTECTED]
ARK.EDU>
Thank you for your response.
Referencing your Using z/VM in a SCSI Environment presentation from WAVV
May 2007 you have the following: IODEVICE ADDRESS=(5400,128)… Why 128?
Aside from guest access channel limits per channel what are the effects, if
any, of setting this lower or higher? This is what I could not find.
Regards,
Kevin
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
Behalf Of Steve Wilkins
Sent: Monday, May 21, 2007 9:54 AM
To: [email protected]
Subject: Re: HCD FCP IODEVICE ADDRESSes
The IODEVICE Addresses represent the FCP subchannel devices out to the SAN.
They are not the actual disk volumes. They are portal devices, much like
how OSA subchannel devices are to an IP network.
The FCP subchannels are all you will configure in HCD or IOCP. The actual
disk volumes are configured either in Linux or VM via the WWPN of the
storage controller port and the LUN name associated with the actual volume.
Please see one of my SCSI presentations on my developer website for more
info:
http://www.vm.ibm.com/devpages/wilkinss/
I would recommend the WAVV 2007 version.
Regards, Steve.
Steve Wilkins
IBM z/VM Development
