Can IBM System x3650 passthrough SAS?

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http://serverfault.com – I am looking at the specs and manual for the IBM System x3650. According to the specs a ServeRAID-8k-l hardware RAID comes standard, but there's an option to upgrade to ServeRAID-8k. If I understand this correctly, this system will always have some h/w RAID. I have found that h/w RAID firmware often assumes that all disks attached should be part of a RAID configuration managed by h/w, and of the same make of h/w at that. This won't always be the case, either because one is using s/w RAID and/or because HDDs are being brought in from other systems with data on them. My question is whether (HowTos)