-----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of R.S. Sent: Monday, April 26, 2010 2:17 PM To: [email protected] Subject: Re: 25 reasons why hardware is still hot at IBM
W dniu 2010-04-26 18:52, McKown, John pisze: [...] > I don't know the I/O capacity of the newest PC "fibre" I/O, but did find a > Web site which says 4 GiB/Sec. But I'm relatively sure that there are fewer > fibre HBAs in most servers than there are FICON channels, the nearest z > equivalent (I think), on a z. And I also wonder if such devices or PC servers > have "multipath" capability, similar to the z's. I am totally certain (watch > somebody prove me wrong) that it is impossible to have "shared DASD" on a PC > like we are used to. Indeed, I/O is still VERY strong advantage of mainframes. BUT: 1. 8Gbps FC were first, before FICON Express8 2. If you use screwdriver and open FICON card you would see PCIe cards inside. The same apply to modern OSAs, Cryptos. Caution: older models contains PCI-X, newer PCIe. 3. Multipathing is still significantly worse in their world, but the technology is maturing, especially in AIX. 4. Number of FC interfaces is indeed smaller per PC, but comparable per full rack of PCs. And we use single piece of mainframe, while they're using dozens of racks of cages of blades of PC's <vbg> 5. Shared DASD does exist in "SCSI world", but serialization is worst than the worst possible configuration of GRS. However it is used for clustering. 6. They are hot on our heels. We had LPARs, VM - they also have something similar. Many years later, significantly worse, but they have. We have Coupling Facility - they are also trying to share memory. We had SAN (ESCON) - they also have SAN, in some aspects better than our. I think I feel what ancient Romans thought about the barbarians. -- Radoslaw Skorupka Lodz, Poland -- BRE Bank SA ul. Senatorska 18 00-950 Warszawa www.brebank.pl Sd Rejonowy dla m. st. Warszawy XII Wydzia Gospodarczy Krajowego Rejestru Sdowego, nr rejestru przedsibiorców KRS 0000025237 NIP: 526-021-50-88 Wedug stanu na dzie 01.01.2009 r. kapita zakadowy BRE Banku SA (w caoci wpacony) wynosi 118.763.528 zotych. W zwizku z realizacj warunkowego podwyszenia kapitau zakadowego, na podstawie uchway XXI WZ z dnia 16 marca 2008r., oraz uchway XVI NWZ z dnia 27 padziernika 2008r., moe ulec podwyszeniu do kwoty 123.763.528 z. Akcje w podwyszonym kapitale zakadowym BRE Banku SA bd w caoci opacone. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
