On Mon, 23 Jan 2012 10:18:09 -0500, Jousma, David wrote: >Iosq? Really? This is raid dasd, isn't "slow" 3390-9's a thing of >the past? > Is z/OS unaware of the underlying RAID and designed not to dispatch concurrent operations to what it sees as a single device?
>-----Original Message----- >From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On >Behalf Of Staller, Allan >Sent: Monday, January 23, 2012 10:09 AM > ><snip> >1. We just had 3390-9's configured into our EMC box. This box also >contains 3390-3's. Given that the hardware is the same throughout and >all other things being equal, is there any decrease in response time on >the mod-9's? ></snip> > With SLEDs, response time would be more likely to increase than decrease, because of increased seek lengths and because of contention. With RAID, things are less predictable. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
