Partition design for hybrid drive

Hi everybody.
I have a laptop with a seagate hybrid drive.
Win 8.1 is preinstalled and will find itself later in a kvm vm.
gdisk (with live cd boot) shows one partition at the very end, spread over 8gb, code 8400, description intel rapid start.
I read the ssd will decide by itself (hardware logic) which data will make it there or not. Did I get this right and isn't linux involved in any way? I am afraid I missed something and have to use those 8gb for the root file system and make the other hd-space available by mounting to other mount points?
My guess is to keep the ssd-partition untouched, delete all the others and create one big partition for use with arch. I would like to encrypt it using luks and have lvm on top of it.
Is that the way to go, using 2 partitions in the end (1 ssd, 1 for the rest)? Or do you recommend another way?
Thanks for your help.
fuz

arch_fuz wrote:I read the ssd will decide by itself (hardware logic) which data will make it there or not. Did I get this right and isn't linux involved in any way?
I think this is correct, at least that't what implied here.

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