Re: Wheezy install - grub wont write to MBR with RAID and LVM
On Wed, Jul 6, 2011 at 12:51 PM, Camaleón <noelamac@gmail.com> wrote:
> On Wed, 06 Jul 2011 12:33:14 -0400, Tom H wrote:
>> On Wed, Jul 6, 2011 at 11:49 AM, Camaleón <noelamac@gmail.com> wrote:
>>> On Wed, 06 Jul 2011 10:14:14 -0400, S Scharf wrote:
>>>>
>>>> 2) The Motherboard has Intel Raid support. If I enable the motherboard
>>>> Raid, the installer does not see the raid disk. (for that matter
>>>> neither does my systemrescuecd, but a Ubuntu 11.4 live boot can see
>>>> it). What do I have to do to make this useable?
>>>
>>> I would seriously reconsider that setup unless you really *really* need
>>> it (that is, unless you have to dual boot with windows + RAID).
>>>
>>> Linux software raid (md) is a more safe approach than using the BIOS
>>> fakeraid facility (dm).
>>
>> This may or may not convince you that dmraid's OK: you can manage dmraid
>> volumes with mdadm.
>
> I don't fear dmarid but manufacturer's BIOSes that can make use non-
> standard ways of handling hard disk controller data. You know, they don't
> provide open specs for devels can develop stable tools, so I would prefer
> to stick to mdraid and AHCI or SATA mode that are well-known. I don't
> like to play "russian roulette" with my data.
To Cameleon: You cold say that of "real" hardware raid too! I *much*
prefer mdraid but the fears about fakeraid and "real" hardware raid
are overblown.
To OP: I created an LVM over RAID setup; one RAID1 array, md0,
composed of sda1 and sdb1 and one VG, vgsys, with two LVs, lvboot and
lvsys. d-i was unable to install grub. I moved to VT2, chrooted
/target/, ran "grub-install /dev/sda", "grub-install /dev/sdb", and
"update-grub", exited the chroot and the VT, moved back to VT1, and
continued the installation by choosing not to install a bootloader.
Looking at "/var/log/installer/syslog", I see that d-i ran "chroot
/target grub-install --no-floppy --force /dev/sda" and it resulted in
an "fopen failed: No such file or directory" error followed by a
"grub-probe: error: cannot find a GRUB drive for
/dev/mapper/vgsys-lvboot".
I assume that my chrooted "grub-install" succeeded because I
bind-mounted "/dev" to "/target/dev" and mounted "/target/dev/shm",
"/target/dev/devpts", "/target/proc", and "/target/sys".
Reply to: