On Sat, 2004-02-28 at 06:40, Phil Payne wrote: > > > Are many shark shops using open system formatted DASD for z/Linux? > > More and more every day. It's *much* faster than ECKD. > http://www.perfassoc.com/jsc/pdf/papers/flex-es_io_performance_02.pdf > zSeries emulation on Intel maps ECKD onto open systems formatted DASD. It can be > blindingly > fast.
Although your CPU performance in emulation, um, isn't. If you have a zSeries that can *do* FCP, don't mess around with the ECKD layer at all: just present your disks to Linux as Fibre Channel SCSI, and you're off to the races. I frankly don't see why you'd want to run z/Linux on a Flex-ES box. If what you need is a cheap S/390 for development or for proving that your app works once ported, use Hercules: since it's z/Linux you don't have licensing concerns if you run it under Hercules, and you've saved yourself a big whack of money right there. If you care about performance and this is a production app rather than a development box, then emulating the S/390 is silly (it's not like you have legacy Linux/390 code that ran on your 3090, you know): just put the app on the native Linux for whichever platform, probably Intel, you have. Adam
