Raju, If memory serves me correctly, with IBM DASD aren't you required to define the first two ranks as R5 6D+1P+1S, where S is the floating Dynamic Spare?
Ron -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Raju Reddy Sent: Friday, February 15, 2013 3:51 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: [IBM-MAIN] DS8870 - Ranks - RAID issue We need to achieve RAID 5 (7+P) combination. I tried too google and read many documents.. but no use. Any suggestions please.? Regards, Raju On Fri, Feb 15, 2013 at 8:44 AM, Raju Reddy <rajunjmainfra...@gmail.com>wrote: > Hi All, > > We are under the process of migrating to DS8870 from DS8810. > While I create new Ranks with Array capacity of 2400GB(8*300GB), I get > around 1652GB of usable storage while rest will go for Parity and Spare. > We use SSD disks and I used Ranks to pick RAID5 which automatically > picked RAID 5 (6+P+S) and thus causing loss of 750 GB of storage. > We need RAID 5 (7+S) for 'Development' LPAR's to increase the usable > storage but DS8000 GUI is not allowing me chose RAID 5 (7+S) combination. > Can you please advice how to make Ranks pick RAID 5 (7+S) combination.? > Regards, > Raju > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
