RAID and SSD configuration question - Mailing list pgsql-general

Hi

I have a supermicro SYS-1028R-MCTR, LSI3108 integrated with SuperCap
module (BTR-TFM8G-LSICVM02)
- 2x300GB 10k spin drive, as raid 1 (OS)
- 2x300GB 15k spin drive, as raid 1 (for xlog)
- 2x200GB Intel DC S3710 SSD (for DB), as raid 1

So how is better for the SSDs: mdraid or controller's raid?

I read a couple of times that is better in mdraid. In this case the SSDs
is configured as write through in raid controller's bios and with disk
cache enabled, right?

What's the difference between Write Back and Always Write Back with
supercap module?

Thanks

--
            Levi