raid0 + raid1 question

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I have 7 disks in an x86 box. I want to have 2 raid0's (concatenations) of 3 disks each. Then I want to raid1 (mirror) the raid0's. This leaves 1 disk for the OS.

Is it possible to remove one of the raid0's (concatenation of 3 disks) from the raid1 (mirror)?

I need to perform a backup while a highly visible application continues to run. Currently I am using Disksuite on a Solaris 8/SPARC platform with the afore mentioned configuration. First the mirror is broken and half of the mirror is mounted as another filesystem while the application continues to run on the other half of the mirror. The backup is performed and then the mirror is resync'ed. However, I want to move to x86 and linux and need to know if the same is possible and how to do it. Does anyone have any experience / advise?

--
Anthony Mayes
UNIX Server Administration
Southern Illinois University Edwardsville
anmayes@siue.edu


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