raid advice with SSD and two HDD

Posted by Nin on Ask Ubuntu See other posts from Ask Ubuntu or by Nin
Published on 2012-11-15T09:54:39Z Indexed on 2012/11/15 11:24 UTC
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hard-drive

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raid

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disk

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ssd

I have a new machine with one 128GB SSD and two 1TB HDD. On the SSD is the OS and my initial thought was to put the two HDD in RAID 1 for user data.

After some more thought I came up with two other setups and now I'm in doubt :) Can someone advise what would be the best setup?

1: single SSD and HDD in RAID 1 (original thought)

2: Create 2 partitions on the HDD (128GB and 872GB). Put the two 872GB in RAID 1 and create another RAID 1 with the SSD and one 128GB HDD partition.

3: Create 2 partitions on the HDD (750/250), put the 705GB in RAID 1 and use the 2 250GB as backup and make automatic snapshots of the SSD to (one of) these partitions.

I think the 2 main questions are:

Is it advisable to create a raid array with only part of a drive and actively use the other part of that drive or should you always use the full disk?

Is it advisable to create a raid 1 array with a SSD and HDD or will that blow the whole speed advantage of the SSD?

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