On Wed, Nov 11, 2020 at 3:38 PM Warren Young <warren at etr-usa.com> wrote: > On Nov 11, 2020, at 2:01 PM, hw <hw at gc-24.de> wrote: > > > > I have yet to see software RAID that doesn't kill the performance. > > When was the last time you tried it? > > Why would you expect that a modern 8-core Intel CPU would impede I/O in > any measureable way as compared to the outdated single-core 32-bit RISC CPU > typically found on hardware RAID cards? These are the same CPUs, mind, > that regularly crunch through TLS 1.3 on line-rate fiber Ethernet links, a > much tougher task than mediating spinning disk I/O. the only 'advantage' hardware raid has is write-back caching. with ZFS you can get much the same performance boost out of a small fast SSD used as a ZIL / SLOG. -- -john r pierce recycling used bits in santa cruz