In a few weeks parts for my new computer will be arriving. The storage will be a 128GB SSD. A few weeks after that I will order three large disks for a RAID array. I understand that BTRFS RAID 5 support will be available shortly. What is the best possible way for me to get the highest performance out of this setup. I know of the option to optimize for SSD's, but wont that affect all the drives in the array, not to mention having the SSD in the raid array will make the usable size much smaller as RAID 5 goes by the smallest disk. Is there a way to use it as a cache the works even on power down. My current plan is to have the /tmp directory in RAM on tmpfs, the /boot directory on a dedicated partition on the SSD along with a 12GB swap partition also on the SSD with the rest of the space (on the SSD) available as a cache. The three mechanical hard drives will be on a RAID 5 array using BTRFS. Can anyone suggest any improvements to my plan and also how to implement the cache?
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