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Old 08-21-2001, 10:20 AM   #1
Q25
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Registered: May 2001
Distribution: RedHat 9.1
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Installing a RAID 1 on a running server


Does any1 have experience with added a RAID controller and a new disc for mirroring the data on the other disc without having to reinstall..
Should be possible right?
I simply can't wait any longer with starting setting up the server, but the store still hasn't got a Linux compatible RAID controller for me..

thx..
 
Old 08-21-2001, 02:42 PM   #2
mcleodnine
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Yep it's doable. See http://www.linuxdoc.org/HOWTO/Boot+Root+Raid+LILO.html

It depends on the RAID controller though. Some want you to everything at the BIOS level. For some hardware that plays nice with Linux check out www.3ware.com. One of the bodies on this board has been using them with very good results.

A po' boy like me hasn't had the opportunity to play with one of 'em yet, but I can do it with software RAID no prob. The procedure goes something like this. (PLEASE READ THE HOWTO for a detailed setup!!!)[list=1][*]Confirm you have the RAID as part or your kernel (or module if you want to make things more exciting) and that you have the most recent version of 'raidtools' installed and conifgured.[*]Shut down the server [*]Install new hard drive.[*]Power up and partition.[*]Build your /etc/raidtab file - mark the ORIGINAL disk partitions as 'failed-disk'[*]Build the RAID array - 'mkraid /dev/mdX' since the ORIGINAL disk is marked as a 'faild-disk' it won't get striped (yet).[*]Format the array 'mke2fs' or 'mkreiserfs' ( I like reiserfs myself...)[*]Mount the array[*]Copy your current root fs to the array (I use this from the / fs 'find . -xdev | cpio -pm /where_you_mounted_your_array[*]Build a boot floppy that uses root=/dev/mdX to see if you can mount the new degraded array.[*]Once you have confirmed that things are working properly you can get LILO to boot from the new array. Test this.[*]Now you can use 'raidhotadd' to include your original disk in the array.
[/list=1]
 
Old 08-21-2001, 02:49 PM   #3
Q25
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k.. thx

Actually I asked them to get the Promise FastTrak 100 TX2

http://www.promise.com/Products/Default.htm#RAID01
 
Old 08-21-2001, 06:31 PM   #4
mcleodnine
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BTW - wharn they say RedHat they mean RedHat. I couldn't get the FT/66 working in SuSE at all. I got burned by ABit on that, too. Bought a BX133-RAID that was s'posed to work under Linux (their Gentus distro) but after recieving it I found out that while there are drivers or it they explicitly state that it won't do RAID under linux. Period.

I'd like to hear from anyone using the FastTrack RAID products under Linux (any distro).
 
  


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