With PAV support for attached/dedicated devices you can achieve I/O concurrency. I have been running some tests from linux guests for simple I/O driving and the results with PAV are most impressive. I have gotten as far as 1 base and 2 aliases so far (I'll keep increasing the # of aliases until break even point). This is with z/VM 520 and SUSE SLES9.
You need to do some setup in IOCP, z/VM, and linux (EVMS). Works well. I look forward to seeing this soon with my Oracle servers. David -----Original Message----- From: The IBM z/VM Operating System on behalf of Raymond Noal Sent: Tue 4/25/2006 1:45 PM To: IBMVM@LISTSERV.UARK.EDU Subject: [IBMVM] z/VM I/O Concurrency Dear List, I was following a topic thread on the IBM-MAIN list server where someone wanted to create multiple Linux LPARs instead of running Linux under z/VM. One respondent stated that z/VM only allows one I/O to a "disk" at a time. Is this really true (Allan??). Does one I/O per disk only apply to mini disks or to attached disks as well? I find it hard to believe that z/VM would be this restrictive. Your thoughts. HITACHI DATA SYSTEMS Raymond E. Noal Lab Manager, San Diego Facility Office: (858) 537 - 3268 Cell: (858) 248 - 1172
