On Wed, Nov 23, 2022 at 6:46 PM Vojtech Trefny <vtre...@redhat.com> wrote:
> Hi, I am planning to change how we support BIOS RAID (sometimes also > called Firmware or Fake RAID) in the installer in the future. I plan > to go through the official Fedora change process for Fedora 38, but > I'd like to get some feedback first. > > We are currently using dmraid to support these types of RAIDs in > blivet[1] (storage library the Anaconda installer uses) and we would > like to replace it with mdadm. The main reason is that dmraid is no > longer actively maintained, but it will also mean one less dependency > for the installer (we use mdadm for the software RAID support) and one > less service running during boot (dmraid-activation.service). > > The potential issue here is that mdadm doesn't support all BIOS RAID > types. mdadm supports only Common RAID Disk Data Format standard[2] > (DDF) and Intel Matrix Storage Technology (IMSM) so by switching to > mdadm we would remove support for some of the older formats that > existed before DDF was standardized. I am not sure how many people are > still using these older RAIDs and the main reason for sending this > email is to find out. So if you are using a BIOS RAID on your system, > can you check what kind? You can find out simply by checking the > filesystem type on the underlying disk(s) reported by for example > `lsblk -f`. Types supported by mdadm are "ddf_raid_member" and > "isw_raid_member". Hi Vojtech. I just confirmed that our Fedora QA test machine in Brno has isw_raid_member-type RAID, so I'm happy to report that we can continue testing Firmware RAID even after this change ;-) Kamil
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