Mike, To be more precise, you have to pay for or configure the multi-path support on the Operating System. I think TRU64 is the only UNIX platform that does it automatically, probably because of its VAX heritage.
Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of > Ron Hawkins > Sent: Wednesday, October 13, 2010 2:49 PM > To: IBM-MAIN@bama.ua.edu > Subject: Re: [IBM-MAIN] When will MVS be able to use cheap dasd > > Mike, > > That's because you have to pay for or configure multi-path support for SCSI > attached drives. Been that way since before Fibre Channel. > > I wouldn't blame the IBM hardware for that - it supports multi-path access > just fine. > > Ron > > > -----Original Message----- > > From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On > Behalf Of > > Mike Schwab > > Sent: Wednesday, October 13, 2010 1:28 PM > > To: IBM-MAIN@bama.ua.edu > > Subject: Re: [IBM-MAIN] When will MVS be able to use cheap dasd > > > > We have a ESS F20 box bought about 1999. We have had some repeated > > NVS failures on it, when the mainframe was configured to block the > > failing cluster, it continued to work. We moved off of it and > > configured it for open systems. AIX boxes with 1 FC card. When it > > went down, the AIX box was down too. Not configured to access the > > same disk via multiple pathways. > > > > On Wed, Oct 13, 2010 at 1:12 PM, R.S. <r.skoru...@bremultibank.com.pl> > wrote: > > > W dniu 2010-10-13 03:05, Ron Hawkins pisze: > > > [...] > > > > > >> The difference between the cost of midrange and enterprise storage has > > >> little to do with end-to-end data protection, because it's all SCSI, > SAS > > >> and > > >> SATA once your write leaves the FICON channel on Enterprise. It has > much > > >> more to do with survivability, availability, scalability, and software > > >> options or lack thereof on midrange storage > > >> > > >> The best illustration of this were the last set of ratings that the now > > >> defunct RAID Advisory Board issued, where most Enterprise Class > > >> controllers > > >> were classified as Disaster Tolerant Disk Subsystems, and midrange was > > >> typically classified as Fault Tolerant Disk Subsystems. > > >> > > >> Typically midrange storage will stay connected and keep running if a > > >> component fails, but FRU replacements, upgrades and suchlike are likely > to > > >> be disruptive - they're not five nines in all situations and that's why > > >> they > > >> are cheaper. > > > > > > The original question was: Why *THE SAME* dasd box costs less when it's > sold > > > for FBA (distributed) systems, and costs more when it's CKD. Same > hardware, > > > usually comparable set of software features. > > > -- > > > Radoslaw Skorupka > > > Lodz, Poland > > > > > > > > > -- > > > BRE Bank SA > > > ul. Senatorska 18 > > > 00-950 Warszawa > > > www.brebank.pl > > > > > > S d Rejonowy dla m. st. Warszawy XII Wydzia Gospodarczy Krajowego > Rejestru > > > S dowego, nr rejestru przedsi biorców KRS 0000025237 > > > NIP: 526-021-50-88 > > > Wed ug stanu na dzie 16.07.2010 r. kapita zak adowy BRE Banku SA (w ca > o > > > ci wp acony) wynosi 168.248.328 z otych. > > > > > > ---------------------------------------------------------------------- > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO > > > Search the archives at http://bama.ua.edu/archives/ibm-main.html > > > > > > > > > > > -- > > Mike A Schwab, Springfield IL USA > > Where do Forest Rangers go to get away from it all? > > > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@bama.ua.edu 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 lists...@bama.ua.edu 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 lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
