I have reproduced today this same problem with a freshly installed and fully up-to-date Ubuntu Trusty 14.04.3 64bit on a Dell Poweredge R300 with the SAS6i/R controller. The system has 2 SAS disks configured as a RAID1 volume in the SAS 6i/R.
Switching to kernel linux-generic-lts-wily did not solve the problem.
We implemented the rootdelay workaround and that let the system boot without problems. After experimenting with various root delays we settled on 45 seconds, it seems ok after trying various cold and warm reboots. We tried 30 seconds but that was not enough.
I have reproduced today this same problem with a freshly installed and fully up-to-date Ubuntu Trusty 14.04.3 64bit on a Dell Poweredge R300 with the SAS6i/R controller. The system has 2 SAS disks configured as a RAID1 volume in the SAS 6i/R.
Switching to kernel linux-generic- lts-wily did not solve the problem.
We implemented the rootdelay workaround and that let the system boot without problems. After experimenting with various root delays we settled on 45 seconds, it seems ok after trying various cold and warm reboots. We tried 30 seconds but that was not enough.
Hope this helps...