Re: DASD I/O performance VM 44 vs. VM 52

2006-03-17 Thread Tom Duerbusch
Right, they are. But they are one or the other, not both. So $25K a piece for a pair of FICON. And $25K a piece for a pair of FCP. That is, if you need to run both mainframe and scsi attached devices. And then, you have the cost on the dasd side. One dasd subsystem with FICON. Another DASD su

Re: DASD I/O performance VM 44 vs. VM 52

2006-03-17 Thread Neale Ferguson
That's strange. I thought the FCP and FICON adapters were one in the same with different microcode. The IOCDS setting of TYPE=FCP (?) was what caused the different microcode to be loaded. There are different FICON cards though aren't there? FICON Express etc. I wonder if this was the difference.

Re: DASD I/O performance VM 44 vs. VM 52

2006-03-17 Thread Tom Duerbusch
e notify the sender immediately by reply e-mail and delete the e-mail from your system. -Original Message- From: VM/ESA and z/VM Discussions [mailto:[EMAIL PROTECTED] On Behalf Of Rob van der Heij Sent: Thursday, March 16, 2006 3:31 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: DASD I/O perf

Re: DASD I/O performance VM 44 vs. VM 52

2006-03-16 Thread Romanowski, John (OFT)
: Thursday, March 16, 2006 3:31 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: DASD I/O performance VM 44 vs. VM 52 On 3/15/06, Romanowski, John (OFT) <[EMAIL PROTECTED]> wrote: > On VM 5.2 I'm considering trying FBA emulation on SCSI for Linux guests > to simplify each Linux gues

Re: DASD I/O performance VM 44 vs. VM 52

2006-03-16 Thread Rob van der Heij
On 3/15/06, Romanowski, John (OFT) <[EMAIL PROTECTED]> wrote: > On VM 5.2 I'm considering trying FBA emulation on SCSI for Linux guests > to simplify each Linux guest's configuration and save staff time. > > If the additional CPU overhead doesn't hurt much it'll be worth it. I have no numbers fro