Hi, with FW 6.0.x you can connect a Perc6/e only to a split mode MD1000 using 2x cables. All FW above is able to handle a 2nd path in joint bus mode as well. That will add some redundancy to your config. And there will be even a sort of load balancing...
Your assumption does only apply to Perc5/e and 1st FW of Perc6/e. See: http://ftp.us.dell.com/SAS-RAID/R200989.txt 5.0 Enhancements/Tasks ====================== 1. The PERC 6/E Adapter now supports a redundant SAS cable to external disk storage enclosures and can balance I/O load across paths. Bye, Jens. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John Hodrien Sent: 19 January 2010 12:55 To: linux-poweredge-Lists Subject: RE: Attaching MD's to R900 On Tue, 19 Jan 2010, [email protected] wrote: > Can't see a point in that. It doesn't matter whether you use Perc5 or 6. > One thing to consider is, that Perc6/e with most recent FW is able to > handle multipath to MD which Perc5/e doesn't. Keep in mind that > MD1000 has two modes -> split + joint bus. You can only use 2x Percs > connected to MD in split mode. Forgive me for being dim... Are you saying you can use two ports on a PERC6/e to connect to an MD1000 in split mode? But that'd still fail if either link failed, assuming you had an array that spanned both sides, right? Is the alternative unified but with a active/passive? I was working on the assumption that active/active in unified wasn't supported, is that right? jh _______________________________________________ Linux-PowerEdge mailing list [email protected] https://lists.us.dell.com/mailman/listinfo/linux-poweredge Please read the FAQ at http://lists.us.dell.com/faq
