Possible bottleneck w/ SATAI drives for OS?

Computer Hardware & Server Infrastructure Builds
1

As stated in my previous post, my h/w is as follows:

Motherboard: ASRock Rack EP2C602-4L/D16 (4 Intel GbE interfaces)
Processors (x2): Xeon E5-2670 - 8 cores (HT) @ 2600MHz
Memory (256GB): Kingston 16GB 2RX4 PC3-12800R DDR3 Reg ECC Server Memory SL16D316R11D4 (x16)
Storage1 (120GB ZFS): Samsung EVO 850 SSD SATA 6Gbps <---- SLOG for ZIL offloading
Storage2 (24 TB RAIDZ1): Seagate IronWolf 8TB 7200RPM SATA 6Gbs (X4)

For primary OS HD, instead of a USB stick, I am considering using two (RAID1) 74GB WD Raptors. My worry is that their max speed of 1.5 Gbps will bottleneck the system.

Is my concern warranted?

2

With FreeNAS, once the OS is loaded it doesn’t do much writing to the OS drive, that is why I just have my FreeNAS systems loaded on USB thumb drives.

3

Is that a benefit unique to FreeNAS?

4

There are a few OS`s that can use this “feature” if you will. The truth is it just doesn’t take that much to run a NAS, And all the Plugins and Jails are run on the pool. FreeNas Was not built to do this so much as it’s just how it is.