Re: Software RAID and GRUB on CentOS 7

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On 12/08/16 01:20, William A. Mahaffey III wrote:
On 08/11/16 02:33, Nicolas Kovacs wrote:
Hi,

When I perform a software RAID 1 or RAID 5 installation on a LAN server
with several hard disks, I wonder if GRUB already gets installed on each
individual MBR, or if I have to do that manually. On CentOS 5.x and 6.x,
this had to be done like this:

# grub
grub> device (hd0) /dev/sda
grub> device (hd1) /dev/sdb
grub> root (hd0,0)
grub> setup (hd0)
grub> root (hd1,0)
grub> setup (hd1)
grub> quit

I'd like my server to be able to boot a degraded software RAID after an
eventual hard disk failure.

Any suggestions?

Niki Kovacs

I have an aging FC14 (!!!!) system, w/ mdadm RAID partitions. I have /boot setup as mdadm RAID1's, 2 drives (actually partitions). Machine boots AOK, & I believe it does (& maintains) that setup automatically. I got that recommendation from a mailing list ages ago, can't remember where, sorry. $0.02, no more, no less ....


[root@Q6600:/etc, Thu Aug 11, 08:25 AM] 1018 # df -h
Filesystem    Type    Size  Used Avail Use% Mounted on
/dev/md1      ext4    917G  8.0G  863G   1% /
tmpfs        tmpfs    4.0G     0  4.0G   0% /dev/shm
/dev/md0      ext4    186M   60M  117M  34% /boot
/dev/md3      ext4    1.8T  1.4T  333G  81% /home
[root@Q6600:/etc, Thu Aug 11, 08:26 AM] 1019 # uname -a
Linux Q6600 2.6.35.14-106.fc14.x86_64 #1 SMP Wed Nov 23 13:07:52 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
[root@Q6600:/etc, Thu Aug 11, 08:26 AM] 1020 #


I too use this kind of set up. however I do not believe that anything on the MBR is updated automatically by any yum/rpm updates. Thus in this kind of a setup, one needs to take manual steps.
HTH
Rob
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