Creating a mirror raid

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wnowak1

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I am attempting to mirror my root drive, but I'm not able to drag the root disk to the list box in disk utility. I have a second hard drive which I would like to use to mirror.

I have a dual g5 with 10.4.7.

Primary disk:
152.7 GB Maxtor ( Mac OS Extended (Journaled) )

Second disk: 372.6 GB Seagate.
Partitioned as follows:
Slice 1: 152.54 GB Mac OS Extended (Journaled ) ( which is the same as the root disk )
Slice 2: 219.95 GB ( used for extra space )

Is it not possible to mirror the root disk? Or am I doing something wrong ?

My Steps:

Click on RAID tab in Disk Utility
Click the + sign to Add a RAID Set. I then name the RAID Set.
I choose Mac OS Extended (Journaled )
RAID Type: Mirrored Raid Set

Thanks.
 
Boy I don't think that's possible. Generally it's best to mirror two freshly formatted drives that are of the same model. You might consider getting a second Seagate that matches the one you have. You can erase both seagates and create the mirrored raid. Then perhaps sell the Maxtor before it craps out :)
 
There's only room for one more drive in the tower besides the boot disk... So I can have the OS disk and another one. ( unless there is another free slot )

I do have to identical seagate drives. If I were to reinstall the operating system, would I be able to mirror the drives during setup?
 
wnowak1 said:
I am attempting to mirror my root drive, but I'm not able to drag the root disk to the list box in disk utility.
Click to expand...

The reason for this is that a RAID set must be initialized and formatted before you can use it -- since you're booted from the internal hard drive, you cannot reformat it -- so Disk Utility will not let you add it to the RAID set.

If you boot from your OS X Install CD/DVD and wish to reformat your system drive to add it to a RAID, you can do it that way, but you will lose all information stored on both drives.
 
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