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A couple quick questions on RAID

post #1 of 13
Thread Starter 
I am about to purchase a laptop (thanks in part to those that bought stuff from my FS threads ), and it has 2 HDD slots. Only issue is that HP decided to disable hardware RAID because they felt like it . So, I've heard that software RAID is just as effective, except that it takes a little bit of CPU usage, nothing noticeable, correct?

Another issue is with a failed RAID0 array. Say that I had a RAID0 array, and kept constant backups. One day, the array fails, and I decide to set up a new RAID0 array. How would I go about restoring the backup onto the new RAID0 array?

Finally, if I were to put non-identical drives (a slower and a faster drive) in RAID0, would the performance be:
a. Same as if I RAID0'ed 2 of the slower drives (if I had 2 of the slower drives)
b. Slightly faster than a RAID0 array of the slower drives.
Just wondering if the faster drive's extra speed will go to waste if I RAID0'ed it with a slower drive.

Thanks everyone!
post #2 of 13
I wouldn't use a RAID 0 array on a laptop.
Risk of failure is a few times higher than a desktop drive, and your power consumption will increase as well.

SSD would probably be your best bet.

Also, any 'hardware' RAID in that kind of environment would be a 'fakeRAID' which would still use your CPU. With RAID 0 it's not a big deal since you don't have to calculate parity.
Quote:
Finally, if I were to put non-identical drives (a slower and a faster drive) in RAID0, would the performance be:
A
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post #3 of 13
Thread Starter 
Can't afford a SSD at this point... I'll be able to back up regularly though.
post #4 of 13
AFAIK there's never been any hardware RAID in a laptop.

Would you mind sharing a link?

As usual any RAID is performance limited to the lowest spec'd drive in the array.

Be it speed, cache, or whatever, the array will use the lowest spec.
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post #5 of 13
Thread Starter 
Maybe hardware RAID was the wrong way to put it, I just meant not having to use disk management to set up a virtual RAID.

So what happens when I want to restore a backup onto a new RAID0 array? How would that work?
post #6 of 13
Quote:
So what happens when I want to restore a backup onto a new RAID0 array? How would that work?
I've had good experiences with that and bad experiences with that.

Usually you can just transfer the image to a RAID0 array because the array should appear as one drive.

That's the best case scenario but I can't guarantee it will work smoothly will all the combinations of back-up programs and drive configurations.

Just approach it with a dominating stance, let it know you're the boss, start the procedure and have a beer.

It doesn't always work but after three or four starts with beer you may not care as much if it doesn't work.
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post #7 of 13
Thread Starter 
Wait, but how am I supposed to dump the image on the new RAID0 array when there's no operating system on it? Am I supposed to use a Linux liveCD or something?
post #8 of 13
Quote:
Originally Posted by hli53194 View Post
Wait, but how am I supposed to dump the image on the new RAID0 array when there's no operating system on it?


I dunno 'bout yours but all my back-ups have the OS included.
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post #9 of 13
Thread Starter 
So how would I copy the data over?
post #10 of 13
I wouldn't bother with software raid.

Wait till you can afford an SSD and then make it your primary and use a platter drive for basic storage/software.
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