12 Nov
2020
12 Nov
'20
midnight
On Wed, Nov 11, 2020 at 3:38 PM Warren Young warren@etr-usa.com wrote:
On Nov 11, 2020, at 2:01 PM, hw hw@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Why would you expect that a modern 8-core Intel CPU would impede I/O in any measureable way as compared to the outdated single-core 32-bit RISC CPU typically found on hardware RAID cards?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