Re: 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 Coastthat 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
Re: z/VM I/O Concurrency
Do you also still have a 601? Regards, Richard Schuh -Original Message- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED]On Behalf Of Bruce Hayden Sent: Tuesday, April 25, 2006 12:04 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: z/VM I/O Concurrency We still have one in the museum (also known as the heritage center) here at Endicott... :-) On 4/25/06, Huegel, Thomas [EMAIL PROTECTED] wrote: And I thought I was the only one left that remembered the six foot tall disk drive on the RAMAC 305. -- Bruce Hayden IBM Global Technology Services System z Linux Endicott, NY
Re: z/VM I/O Concurrency
Wasn't that the one with the single read/write head on an arm that would do a seek to the platter before it started going after the rec. If I remember correctly, CE's would normally keep a big pan underneath to catch the constant drippings of hydraulic oil. I remember something like that, altho it may have been the S/360 reincarnation of the 2nd generation drive, just as the 2311 bore a striking resemblance to a 1311. Jim At 02:34 PM 4/25/2006, you wrote: This is a multi-part message in MIME format. --_=_NextPart_001_01C66896.F17B2D44 X-EC0D2A8E-5CB7-4969-9C36-46D859D137BE-PartID: A90797A4-37B9-4082-92BE-6647E3C1BC61 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=iso-8859-1 And I thought I was the only one left that remembered the six foot tall disk drive on the RAMAC 305. -Original Message- From: The IBM z/VM Operating System [ mailto:IBMVM@LISTSERV.UARK.EDU]On Behalf Of Schuh, Richard Sent: Tuesday, April 25, 2006 1:13 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: z/VM I/O Concurrency Regards, Richard Schuh . Again, this is a HARDWARE restriction that goes back to the dark ages of s/360. Or farther. Anyone remember the disks used by the 1410 (the model number escapes me, as do so many things of late) or the RAMAC 305? Besides, the S/360 introduced The Age of Enlightenment, didn't it? -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology _ ella for Spam Control has removed 3894 VSE-List messages and set aside 2216 VM-List for me You can use it too - and it's FREE! www.ellaforspam.com http://www.ellaforspam.com --_=_NextPart_001_01C66896.F17B2D44 X-EC0D2A8E-5CB7-4969-9C36-46D859D137BE-PartID: F3A60029-5237-43CE-BF77-570CD74FF5E7 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable !DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.0 Transitional//EN And I=20 thought I was the only one left that remembered the six foot tall disk = drive on=20 the RAMAC 305. -Original Message- From: The IBM z/VM = Operating=20 System [ mailto:IBMVM@LISTSERV.UARK.EDU]On Behalf Of Schuh,=20 Richard Sent: Tuesday, April 25, 2006 1:13 PM To:=20 IBMVM@LISTSERV.UARK.EDU Subject: Re: z/VM I/O=20 Concurrency Regards, Richard = Schuh = SPAN class=3DEmailStyle16 . Again, this is=20 a HARDWARE restriction that goes back to the dark ages of=20 s/360. Or farther. Anyone = remember the disks used=20 by the 1410 (the model number escapes me, as do so many things of late)=20 or the RAMAC 305? Besides, the S/360 introduced The Age of = Enlightenment,=20 didn't it? -- John=20 McKown Senior Systems Programmer HealthMarkets Keeping the = Promise of=20 Affordable Coverage Administrative Services Group Information=20 Technology ella for = "" Control has removed=20 3894 VSE-List messages and set aside 2216 VM-List = for="" me You can use it too - and it's FREE! www.ellaforspam.com --_=_NextPart_001_01C66896.F17B2D44-- Jim Bohnsack Cornell Univ. (607) 255-1760
Re: z/VM I/O Concurrency
Title: Message 'fraid not! They had one at John Deere in Atlantic, Iowa. I was a field engineer at the time and that was one of my accounts. It was glass enclosed and you could watch the access arm move. Mike Myers - Original Message - From: Huegel, Thomas To: IBMVM@LISTSERV.UARK.EDU Sent: Tuesday, April 25, 2006 2:34 PM Subject: Re: z/VM I/O Concurrency And I thought I was the only one left that remembered the six foot tall disk drive on the RAMAC 305. -Original Message-From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED]On Behalf Of Schuh, RichardSent: Tuesday, April 25, 2006 1:13 PMTo: IBMVM@LISTSERV.UARK.EDUSubject: Re: z/VM I/O Concurrency Regards, Richard Schuh .Again, this is a HARDWARE restriction that goes back to the dark ages of s/360. Or farther. Anyone remember the disks used by the 1410(the model number escapes me, as do so many things of late) or the RAMAC 305? Besides, the S/360 introduced "The Age of Enlightenment", didn't it? --John McKownSenior Systems ProgrammerHealthMarketsKeeping the Promise of Affordable CoverageAdministrative Services GroupInformation Technology ella for Spam Control has removed 3894 VSE-List messages and set aside 2216 VM-List for meYou can use it too - and it's FREE!www.ellaforspam.com
