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Re: How to safely switch grub booting in-place from one drive to a repla

From: Xen
Subject: Re: How to safely switch grub booting in-place from one drive to a replacement with RAID?
Date: Thu, 23 Feb 2017 17:02:55 +0100
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address@hidden schreef op 23-02-2017 3:59:

I built new systems before directly onto an array and grub just got
taken care of by the installer.  But I never switched from one set of
drives to another yet.

I once changed a system that was booting from a single /boot to a system that booted from /boot in RAID-1 (mdadm, as you) quite easily. There was not much to it as Andrei says.

In this case it was a GPT system. I created a BIOS boot partition of 2MB on both drives. Both drives had identical partition tables. Both drives had a ~200MB boot partition that I later migrated to RAID-1.

I guess I used grub-install on both. Both systems (both disks) automatically worked, because the root filesystem was also on RAID-1, the system booted just fine, whether the first disk was missing, or the second disk. Of course rebuilding may be more hard.

So in my case (This was Debian 7) I just followed a simple recipe for creating another mdadm array and then unpacked the archived /boot onto it. I probably simply installed Grub on both (/dev/sda and /dev/sdb) and that was all I needed to do.

Andrei means that /sda and /sdb refer to the two disks of your array.

That you need to install Grub on both disks.

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