On 08/28/2014 10:48 AM, Lars E. Pettersson issued this missive:
Hi!
I tried to set up a system using four 3TB disks as a raid6. The disks
are new, no old partitions laying around. I used a USB stick as install
media (Fedora 20 x86_64 Gnome Live).
I chose manual partitioning to get everything as I wanted. When this was
ready I got the error message that I also needed a BIOS boot partition
(I gather that this due to being rather large disks). I tried to create
one of those, but it seemed to only be created on one of the discs in
the raid array, I wanted it created on all disks, just as the raid
partitions. This to be able to boot from any of the disks in the array
in case of a failure. As it is now, if the main disk dies, I can not
start the system at all.
Actually I ended up having three BIOS boot partition on the first disk,
being 2, 1, and 1 MB large. Which is quite annoying. But that's another
problem...
Before submitting a bug report/RFE on this. Is there anyone out there
that have done this, from anaconda? I.e. creating raid partitions and
BIOS boot partitions on ALL disks? If so, how did you do it?
AFAIK, a BIOS boot partition has to be on the primary disk where it can
be found. At boot time, the BIOS no idea about the RAID since it's a
construct of the operating system. Thus the BIOS can't use a partition
on the RAID to boot.
I think you need to reserve some small space on all the drives (and
with 3TB drives you can afford to sacrifice a few MB), use the remainder
as your RAID, and let the system put the boot partition in that reserved
space on the primary drive (the one the BIOS sees as the boot drive).
I prefer hardware RAID for just this reason (e.g. if you lose the
primary drive, it can still boot since the RAID is visible to the
BIOS). Hardware SATA RAID controllers aren't that expensive ($350 US)
for the peace of mind they bring.
This is just my opinion. Your mileage may vary. Void where prohibited.
Batteries not included. Some assembly required. Yadda, yadda.
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- Rick Stevens, Systems Engineer, AllDigital ri...@alldigital.com -
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