Simple back-up idea

I am about to purchase an G5 Xserve with 1x80GB drive module and three 500GB modules. My plan is to use the 80GB module simply for the OS and populate the other two bays with two mirrored 500GB modules.
Here's my plan. To provide a simple back-up procedure I want to simply swap one of the 500GB modules and then rebuild the array to include the new module. This will more than likely be a weekly task than daily.
My questions are:
1 Is this a good, safe idea (disregarding daily back-ups are preferred)
2 What are the risks to the data integrity
3 What effect will this have on the array over time
4 What effect will this have on the modules
5 Is there an alternative using only this hardware
Thanks in advance,
Steve

Apart from not seeing what you expect to gain from mirroring the two 500GB drive, you totally don't want to do this.
Breaking a mirror is a potentially dangerous activity. In addition to that Mac OS X Server has a penchant for not re-using drives that it thinks have failed. At some point after you're swapped drives a few times the OS is going to refuse to rebuild the array on a drive that it thinks has failed in the past. Generally this is a good thing - the whole point of RAID is redundancy and you don't gain much redundancy by using (apparently) flaky hardware.
That aside, even if it worked perfectly every time there is no gain in doing this. Since you're mirroring 500GB drives, the OS will replicate the entire drive to the newly-inserted drive - that's 500GB of data each time, a process that will take hours.
Compare that with how long it would take to backup the entire 80GB OS drive and you'll see that your fastest response is to simply replicate your system drive any time you want to take a backup - it will be quicker to clone the 80GB drive than to rebuild a 500GB mirror.
If you want, rotate out the other drives so that you have 3 point-in-time backups that you can revert to. Just don't try to do this via mirroring.
I also agree with Daddy's comment regarding mirroring the boot drive.
If I were you I'd take two of the 500GB drives and mirror them using additional 500GB drives and a tool like asr to clone the drive to the backup drive.
Then you have mirror protection of your main drive and a number of point-in-time backups.

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This account is no longer active. Contact ShadesOfGray for current posts and information.

Simple back-up idea

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