Rüdiger Meier wrote:
I have never benchmarked any advantage for hardware raid. Actually I found Linux softraid always faster. I guess that it's the reliability which matters.
Yes, reliability and serviceability are key. I guess I could do some actual benchmarking at some point, but performance is secondary.
HW Raid is usually - OS independent, even inclusive remote storage administration, monitoring etc. - certified for (only) certain hard drive models. So that one can be sure that the whole chain (battery backup-ed Cache, HD cache, etc. will survive a power failure without inconsistent file systems.
We have been using 3ware/LSI and HP Smart Array Controllers for more than 10 years, none of them have required certified drives sofar. One annoying issue is their insistence on a battery for the write cache. Our older HSG80 fibre controllers had an option "site-wide UPS". Newer HP conrollers do have that option too.
If you want reliability you need to have a controller cache with battery/capacitor
Unless you have site-wide UPS.
and turned off HD write cache. If you don't have a battery you have to turn off any HD write cache.
Right. -- Per Jessen, Zürich (18.6°C) http://www.dns24.ch/ - free dynamic DNS, made in Switzerland. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org