Rich, thanks for the pointer to the manual, a manual is usually helpful. David, thanks for the ideas.
Bobby Bauer Center for Information Technology National Institutes of Health Bethesda, MD 20892-5628 301-594-7474 -----Original Message----- From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of David Boyes Sent: Tuesday, March 03, 2009 11:06 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: FCP devices in user directory On 3/3/09 10:49 AM, "Bauer, Bobby (NIH/CIT) [E]" <baue...@mail.nih.gov> wrote: > Our up and coming z/VM and zLinux pilot got a present when another section > surplused an old sans device with switches. We hope to get the I/O gen done > this weekend but I haven't been able to figure out how to specify space for a > Linux guest in the user directory. An MDISK statement doesn't look likes it > supports SCSI devices. So how do you specify space in the user directory for a > SCSI device > Since this is all very new to us, I hope I'm not way off base. > Two ways: EDEV or attached devices. I personally prefer EDEV for simplicity reasons (you set up the switches once, allocate a bunch of really enormous LUNs, then define the resulting EDEVs to DIRMAINT as volumes and treat them just like normal minidisks) but there is a performance penalty for that simplicity. Attached devices let you take most advantage of features in the hardware, but you have to worry about WWPNs and masks and all that SCSI stuff every time you want to add space or change volumes, etc.
