Raid one

[Jeffrey Ross]

Karl Larsen wrote:
>    I did a Goggle search and found Linux Journal, Home, RAID-1, Part 1 
> and 2 by Joe Malmin and Ron Shaker, 2002-08-13 and I have read it like 
> a book once. It talks to the raid-1 being a superior way to back up 
> your computer. I learned that raid mirrors partitions not hard drives. 
> You can use any two hard drives or even the same hard drive! I plan to 
> make a raid 1 using the two hard drives I have in this computer right 
> now :-)
>
>    One is a 30 GB and this is a 160 GB but f7 is in a partition of 12 
> GB. So I can make a 12 GB partition on the 30 GB HD and make a raid 1 
> system between /dev/hda2 and /dev/hdb5.
>
>    The book says if /proc/mdstat exists, you have raid support in your 
> kernel. I do :-)
>
>    The book set up raid 1 on Red Hat 7 and Debian Potato with the 
> early kernels 8-)
>
>    It appears I can use the method shown to make a /usr raid 1. I have 
> /usr backed up on my 9 GB USB device. But the author suggests you put 
> a copy of /usr on /var/.  We will use mkraid  which  I find I do not 
> have. Perhaps I can yum it to my system. Perhaps there is a newer tool?
>
>     So like all writing it is dated and old just a couple of years 
> later. Instaed of using #init 1 so that /usr can be un-mounted, I 
> think using the rescue mode of the f7 dvd will be easier. Then f7 will 
> be off :-)
>
>

Karl,

I posted a message about converting a running Fedora 7 system from a 
single disk to a RAID-1 system on June 30th, I listed out the steps I 
followed.  I did however use 2 identical disks.  The subject of the 
message was "RAID gotchas!"

Jeff