Yes but I am hesitant to publish any numbers until I have convinced myself: 1. that I have done a good job 2. that I have done the right job 3. that what I am measuring makes sense 4. that my benchmarks are strong and true not lame and halt 5. that they correlate in some manner and form to real world apps.
Today (well not today actually) I am writing/reading one file of zeroes. Happy to publish meaningful data once items 1-5 have been done with a proper benchmark. David -----Original Message----- From: The IBM z/VM Operating System on behalf of Dave Jones Sent: Tue 4/25/2006 2:17 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: [IBMVM] z/VM I/O Concurrency David, would it be possible for you to collect some performance data on the i/o improvements you're seeing there? Perhaps some CP MONITOR data that we could analyze? It would be nice to know if PAV is really something that Linux on z/VM sites should really be taking advantage of. What was that saying again? "Can't measure it; not interested"? Something like that from somebody on the West Coast....that ring any bells? ;-) DJ David Kreuter wrote: > 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
