----- Original Message ----- From: "John R Pierce" <pierce at hogranch.com> To: <centos at centos.org> Sent: Tuesday, July 12, 2011 12:34 AM Subject: Re: [CentOS] Suggest Hardware Raid Controller Card > On 07/11/11 9:30 AM, Drew wrote: >> Which is funny because Intel's SASUC8i (rebranded LSI3082E-R) is true >> hardware RAID which I recently picked up*new* for $150. They don't do >> RAID-5/6 or have a BBU but IMO you don't need a BBU for RAID-0/1/10. > > you want BBU (or flash-backed cache) if you want write-back cache, and > not mandate write-through. This is quite independent of the RAID type. > It greatly speeds up 'committed' random writes such as are generated by > a transactional database. > Who needs bbu when you can get an SSD to work with your ext3/ext4 that is sitting on an md raid 1/0/nested 1+0/10?