On 03/02/2012 04:20 PM, Bowie Bailey wrote: > On 3/2/2012 4:00 PM, Jonathan Vomacka wrote: >> On 3/2/2012 2:46 PM, Bowie Bailey wrote: >>> On 3/2/2012 1:01 PM, m.roth at 5-cent.us wrote: >>>> Digimer wrote: >>>> <snip> >>>>> Boot from a live CD using the CentOS 6.2 install media. Once booted: >>>>> >>>>> <bash># grub >>>>> <grub> root (hd0,0) >>>>> <grub> setup (hd0) >>>>> <grub> root (hd1,0) >>>>> <grub> setup (hd1) >>>>> <grub> root (hd2,0) >>>>> <grub> setup (hd2) >>>>> <grub> quit >>>>> <bash># reboot >>>>> >>>>> This assumes that grub sees the drives at '0, 1 and 2' and the boot >>>>> partition is the first on each drive. If it is, when you type 'root >>>>> (hdX,0)' it should report that a file system was found. The 'setup >>>>> (hdX)' will tell grub to write the MBR to the specified disk. >>>> THANK YOU! I could have used that once or twice, and had no idea that grub >>>> could create a std. MBR. >>> When I set up a RAID 1, I do it like this: >>> >>> device (hd0) /dev/sda >>> root (hd0,0) >>> setup (hd0) >>> device (hd0) /dev/sdb >>> root (hd0,0) >>> setup (hd0) >>> device (hd0) /dev/sdc >>> root (hd0,0) >>> setup (hd0) >>> >>> This way, all the drives are set up as if they are hd0. This way, any >>> of them will boot normally as a stand-alone drive. >>> >> Bowie, in terms of RAID 10, each drive technically cant be standalone >> right? The drives are striped and mirrored. > > Right. I was referring to RAID 1. For a RAID 10, you would have to > find the proper drive to boot from. This is why I tend to limit myself > to RAID 1 in software. If I need something more complex than that, I > get a hardware card so the OS just sees it as a single drive and you > don't have to worry about grub. > Ya. When I do use four drives, I simply create a four-member RAID level 1 array... Keeps it simple and, frankly, any performance gain from other (mixed) levels would be easily missed. -- Digimer E-Mail: digimer at alteeve.com Papers and Projects: https://alteeve.com