On 10/26/2015 8:23 AM, m.roth at 5-cent.us wrote: > Running CentOS 6.7, on an older HP DL580 G5. We've got a Dell 12-bay RAID > box plugged into a PERC H800 (aka LSI Liberator) that we put in the HP, > and that works fine. We've got a new RAID (a JetStor), and are trying to > plug it in. > > The layout is that the Dell RAID is dual-pathed DAS. Each PERC has two DAS > ports. We've got the Dell RAID in the top port of each PERC. I*thought* I > could just plug the new RAID, which also has two ports, into the bottom > two ports on the PERC. > > TRied rescanning the SCSI bus, /sys/class/scsi_host/host[0-5]/scan, with > no apparent sight of the new RAID. Can I do this the way I've got it, or > do I need to daisy-chain the new RAID through the old RAID? The H800 is a MegaRaid based controller, with dell proprietary firmware. the Dell '12 bay RAID box', does that actually have its own embedded raid controller, or is it just a 12 drive SAS jbod box? I'd expect the latter, as you don't plug a raid into a raid card. the jetstor, same question, does that have its own raid or is it also JBOD ? -- john r pierce, recycling bits in santa cruz