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-   -   adding drives to an existing raid1, EXT3 array` (

huggy77 10-18-2007 06:23 PM

adding drives to an existing raid1, EXT3 array`
I have an existing healthy raid1 array that consists of 2 750 gb seagate es drives. Works great.

I have been trying to add 2 new drives to the previously mentioned array...

I have followed several different examples as of how to do it but i can never get the drives to show up in my /proc/mdstat file...

pls list a step by step overview of what i have to do... The array is EXT3. So far i formatted the 2 drives and i ran MDADM -add with both the drives, my raid is in recovery mode now.. SHould be done by tomorrow.

Pls help me out. Nothing i have tried has worked.

If you can please list a quick overview of the steps needed to get this to work...

Sorry if i sound desperate but i have been trying all week and i cant get the drive so show the new size of 1.5 tb

acid_kewpie 10-19-2007 11:38 AM

raid 1 only uses two drives [well, you can add more, but only for extra conceptual resilience], how do you intended two more drives to work? sounds like you really want raid0+1, raid 10 or to use an LVM group to span two independent raid0 setups.

huggy77 10-19-2007 12:08 PM

thanks - round that out this morning when i came in to find an ultra redundant 4 drive raid 1 array!!! just in case i have 3 drives fail on me ;)

new plan - i removed one drive from the array. mounted it as a temp 1 drive raid at md2.

i took the 3 drives and created a raid5 at md0

md0 is in recovery mode - when it comes online i will move everything from md2 to md0.

then we reformat md2 and add it to the md0 array...

acid_kewpie 10-19-2007 12:24 PM

sure, note though that raid5 is not extensible. you can't add another drive to it. in a 4 drive setup each drive contains 1/4 parity and 3/4 data. adding a 5th isn't possible without rebuilding the entire array from scratch with brand new parity striping. i'd suggest raid1+lvm myself.

huggy77 10-19-2007 12:38 PM

thats ok for now... 1.5 tb should hold us for a couple of months...

next step will be to buy a bigboy array and a promise controller

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