RE: 2 Physical Drives -> One Logical Drive
2 Options: LVM & software RAID 0.
There are 2 issues with software RAID 0 on the Eee laptop would be that your overall performance would be very limited to your slowest SSD, and your array size would be limited to your smallest SSD. This means that if you have a 4 and a 16, your array would be 8GB. It would also only write at the slower SSD speed.
LVM would definitely give you spanning, and I believe it may be supported by the install media only. Basically your / could use both a 4 and a 16 to give you 20GB and your reads/writes to the 4 would perform at that SSDs speed, and any writes after you use 4GB would be slower. The only issue here is the ordering, if the kernel decided to write to the larger SSD first your performance would be as good as your slower SSD. If that's any good.
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