Help installing grub

[Yan Seiner]

I need some help with a custom install.

I have a client that I access via a remote connection.  Their server has 
two physical drives set up in a software RAID-1.  To make a long story 
short, through a "perfect storm" series of events, they lost both hard 
drives.  I shipped them a backup of their data and their local admin got 
the server running on a single drive.

I figured I could set up the other drive as 1/2 of a RAID array, install 
the data, and then reboot the server with the RAID running and complete 
the mirroring operation.  I mostly followed this process:  
https://wiki.archlinux.org/index.php/Convert_a_single_drive_system_to_RAID

I am running into trouble getting a valid boot sector on the new raid 
drive.  This is the first time I've dealt with GRUB 2, and I am not sure 
how to set it up to boot off of /dev/md1 (the boot partition).

Here's what I have:

/dev/sdb - current boot drive with GRUB installed correctly.  This boots 
just fine.
/dev/sda - new half-array drive without GRUB installed.

Q:  How do I get GRUB installed so it boots off of /dev/md1 (/dev/sda2)?

I am doing this all via ssh; I have no physical access to the server, so 
some way of checking that the system will actually boot correctly would 
be welcome.

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