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Newbie RAID questions
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Mac Elite
Join Date: Nov 2002
Location: Washington, DC
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Alright, I know almost nothing about RAID, except that it's redundant. I would like to have two external hd's that have the exact same contents. When I add a file to one, it's also added to the second, and when I trash files from one, it's trashed from the second. Is that RAID?
In order to set it up can I just go into disk utility and drag both drives into the set under the RAID tab?
Sorry I'm so clueless.
-Scott
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Junior Member
Join Date: Apr 2003
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You cannot boot from a software raid. So you need one disk for the os and at lest two extra identical disk for the raid setup. The advantage of this setup is minimum down time and a faster read speed.
But a raid setup only protect you from hardware failure of one of the drive. It won't protect your data from software errors (i.e. virus attack or human errors). If it is going to be your only protection, I would rather set the drive up so that it do an auto full backup of you main drive every Saturday and a partial backup every weekdays. This setup will protect your data from hardware failure and software errors for up to 1 week (-24 hours).
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Mac Elite
Join Date: Nov 2001
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Originally posted by TMLai:
You cannot boot from a software raid. So you need one disk for the os and at lest two extra identical disk for the raid setup. The advantage of this setup is minimum down time and a faster read speed.
But a raid setup only protect you from hardware failure of one of the drive. It won't protect your data from software errors (i.e. virus attack or human errors). If it is going to be your only protection, I would rather set the drive up so that it do an auto full backup of you main drive every Saturday and a partial backup every weekdays. This setup will protect your data from hardware failure and software errors for up to 1 week (-24 hours).
You most certainly CAN boot from software RAID. I do it all the time on an Xserve. I'm fairly certain you can do it on desktop machines (G4s, G5s) too.
I'd only do it on internal drives though, I wouldn't mirror or stripe external drives, due to the possibilty of disconnecting one accidentally.
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Posting Junkie
Join Date: Jun 2001
Location: Chicago, Bang! Bang!
Status:
Offline
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(People should feel free to jump in and correct me at any time)
What you want to do is RAID-2.
I'm with TMLai though, some type of backup system is probably preferable. This has the added advantage of being able to go back and recover something you deleted off your main drive.
If your just worried about hard drive failure, may I suggest RAID-3 (I think I have the number right, it could be RAID-5). RAID-3 spreads proper redundancies across all the drives so any one going down just slows the system, you don't loose any data until 2 or more go south on you. I'm pretty sure you'll need another drive though.
HTH
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