I am trying to delve into dmraid/device-mapper and learn how the magic happens and I came up with what I think is the "way it works." Please critique and correct me where I am wrong or over-simplify the operation of the current dmraid architecture as it is used under Fedora/redhat systems. Assumptions: dmraid compatible device(sil3118) Hard Drives of equal size(SATA in my case) Installation of Fedora Core 7(x86_64) 1. The initial setup occurs on the RAID controller where I selected RAID1 with my two disks. This initialized the drives for use with dmraid/device-mapper by placing the SiL metadata on the drives and set them to a initialized state. 2. The system boots off the first hard drive(sda) and loads the kernel from there. 3. Booting Fedora Core 7, /etc/rc.sysinit loads the fake RAID1 module "dm-mirror". This actually works with the software RAID code in md to manage the RAID1. The system then detects that the drives are a RAID1 set by invoking '/sbin/dmraid -ay -i -p -t' This detects the RAID1 set and creates /dev/mapper/silXXXXXXX through the device-mapper libraries. What is unclear to me is where the system mounts the filesystems on /dev/mapper/silXXXXXX and how the dm-mirror module manages drive failues. Can someone fill in the pieces for me? Sean -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
