SSD optimizations

[Paddy Steed <jarktasaa@gmail.com>]

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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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