@kcomer After updates my understanding is that an installed Rockstor system is upgrade to 1511 bar a python package or two where upstream versions caused incompatibilities. But as to the specific version of CentOS 7 on the install iso I’m not sure.
I have done a few successful mdraid on system installs ie 2 (in this case) disks raided and used for the Rockstor system, Mdraid for data disks isn’t supported as we are only btrfs raid types there.
The documentation has a Mirroring Rockstor OS using Linux Raid which has been confirmed as working. This install method however is not aimed at bios raid but generic software raid installs involving the system (though it may prove to be a workaround for using the bios raid). But I have also done bios raid installs which is more akin to what you are asking after as far as I understand it. The bios raid or fake raid installs also rely on the mdraid subsystem due their software raid nature: mostly. And although there was a caveat during the install it did succeed. I didn’t in these installs notice the NoSuchPackage: indication.
On reading your title again you state dmraid where as my experience is with mdraid which on a quick read up seems to be a superset of dmraid. Maybe the same installer caveat applies.
The following forum thread details mine and another forum members finding re this caveate:
I think the /etc/redhat-release file is bogus in this case and seems to have been neglected in the intervening iso releases. I have opened an issue in the rockstor-iso repo for this:
update redhat-release file in etc