Is that silly to configure a thunderbolt RAID ext HDD with partitions

Question

I have bought a WD my passport pro 4TB thunderbolt ext HDD. My original idea is to use the two HDDs of the my passport pro (in JBOD ) embodied through  thunderbolt and expecting twice the transfer rate from that of usb 3.0 hdd, and 2TB one for storage and  another 2TB as time machine.
Disappointingly, it only provide a barely surpass USB 3.0 performance.
Hence, I am considering  the following, so as to utilize the Raid 0 setup in order to get a better speed performance.
1) Part the two HDDs into A1A2 and B1B2 (each partition 1TB)
2) Map A1B1 into a raid 0 setup, while A2 left idle and B2 as time machine for the my macbook pro and (A1b1 raid 0 set-up)
3) The speedtest result of A1B1 raid 0 and the indviudal A2, and b2 is apparently ok.
My questions are:
1. Would the setting in this way become unstable? and create silly bugs?
2. I read that Raid 0 demand a whole piece of disk to be used? why I could setup in this way through disk utilities?

Answer 1

BLF call presence is not yet working and I haven't identified the buddy watch or the lines in the config file that address this
You have feature.1.name="presence" feature.1.enabled="1" included in your <PHONE_CONFIG></PHONE_CONFIG> It is "generic enable" for so called "buddy watch" feature. But then, you need to configure who's your buddy.
It is part of phone's directory, e.g. [MAC address]-directory.xml file, but you have no such file. I assume your directory (so buddy list as well) is empty. The file in question looks like
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<directory>
<item_list>
<item>
<ct>110</ct>
<lb>Toby Flenderson</lb>
<bw>1</bw>
<sd>1</sd>
</item>
<item>
<ct>106</ct>
<lb>Edna Abbot</lb>
<bw>1</bw>
<sd>2</sd>
</item>
</directory>
The bw is acronym for "buddy watch". Phone directory records with bw=1 are your buddies. It's status is monitored by Polycom phone then.