I have a N7700 Thecus NAS on hand and I am wondering if it is possible to set up different RAID arrays, for example, 3 HDD in RAID 5 and 4 HDD in JBOD? So I can put my important data in RAID and other files in JBOD and get faster file transfer speed.
To my knowledge, any decent RAID controller should allow you to have multiple arrays. In your case I googled a bit and it seems the N7700 does. BTW, I doubt JBOD gives any kind of performance improvements, you would have to use RAID 0.