From: John Robinson <john.robinson@anonymous.org.uk>
To: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
Cc: "Lars Täuber" <taeuber@bbaw.de>, linux-raid@vger.kernel.org
Subject: Re: grub2/grub-pc install not possible on mdadm
Date: Fri, 02 Mar 2012 09:24:15 +0000 [thread overview]
Message-ID: <4F5091BF.1000102@anonymous.org.uk> (raw)
In-Reply-To: <4F508EB6.2030101@profihost.ag>
On 02/03/2012 09:11, Stefan Priebe - Profihost AG wrote:
> Am 02.03.2012 10:06, schrieb Lars Täuber:
>>> Correct that's why i've also tried to install it on sda / sdb but then
>>> grub complains about not finding any partition table.
>>
>> do you have a partition table inside the raid?
>> This will not work I expect. The kernel might find the partition table but
>> grub?
>>
>> Or do you have no partition table at all and a filesystem directly on the
>> raid device?
>
> No partition table on sda / sdb. Partition table is on md127. This
> scenario works fine with metadata 0.9. And as far as i understand it
> should work with 1.2 too.
No, I don't think it should - 1.2's metadata is offset 4K into the
component devices and the data starts later, at 1M or so. That means
that the BIOS can't find the partition table where it expects to. Using
1.0, which has its data right at the beginning and metadata at the end,
might work if 0.90 does. It's still not 100% because a UEFI BIOS isn't
going to find the backup GPT partition table where it ought to.
Unless you are using IMSM or another BIOS-readable RAID, you ought to be
creating partition tables on all your drives, installing GRUB into the
bios-grub partitions, and building arrays from the rest of the
partitions (typically a RAID-1 /boot and any level you like for the
rest; I use RAID-10 for swap and on two drives RAID-10,f2 for the root).
Cheers,
John.
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next prev parent reply other threads:[~2012-03-02 9:24 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-28 9:10 grub2/grub-pc install not possible on mdadm Stefan Priebe - Profihost AG
2012-03-01 10:10 ` Jes Sorensen
2012-03-01 10:25 ` Stefan Priebe - Profihost AG
2012-03-01 10:38 ` Jes Sorensen
2012-03-02 8:44 ` Stefan Priebe - Profihost AG
2012-03-02 9:06 ` Lars Täuber
2012-03-02 9:11 ` Stefan Priebe - Profihost AG
2012-03-02 9:24 ` John Robinson [this message]
2012-03-02 9:33 ` Stefan Priebe - Profihost AG
2012-03-02 11:14 ` John Robinson
2012-03-02 13:15 ` Stefan Priebe - Profihost AG
2012-03-02 13:45 ` John Robinson
2012-03-02 15:32 ` Lars Täuber
2012-03-05 7:50 ` Stefan Priebe - Profihost AG
2012-03-05 9:38 ` John Robinson
2012-03-05 10:14 ` Lars Täuber
2012-03-05 11:31 ` John Robinson
2012-03-05 11:38 ` Lars Täuber
2012-03-05 12:34 ` John Robinson
2012-03-02 9:14 ` Lars Täuber
2012-03-02 9:15 ` Lars Täuber
2012-03-02 10:56 ` Jes Sorensen
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