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Disillusionment ! Hardware Raid with cache ! - DD is CRAP ???? Really ?
darknessends
Member
Hi Guys,
Stuck with a lot of RAID stuff I came to realize that the dd benchmark that has been the primary source of inspiration to buy a VPS or not for most of users is not so real. Even with fdatasync.
I realized the sequential IO was not so much important in a VM environment, also that the real case of doing a long sequential IO that actually takes advantage of such cache is rare event.
Considering that all the server bear IO stuff will not actually reveal a machine that is better suited for real time load vs a not so suitable. The Raid with Cache is certainly doing a lot to improve the sequential IO but nothing else.
Bonniee++ is a better test suite ( Feedback by a lot of people )
If that is so - in actual - Than why this is a complete myth going on around Higher DD scores ?
Is there an actual advantage of using such costly RAID cards or the entire community is following this just to increase their DD scores which are not so related to how your VPS is going to perform at the end.
I would see a good discussion coming on this from a lot of providers. I believe its time for disillusion for all of us. People who are experts here, post the facts you know, lets uncover the truth.
Comments
Thought it's obvious. Everyone knows the facts.
Is there an actual advantage of using such costly RAID cards or the entire community is following this just to increase their DD scores which are not so related to how your VPS is going to perform at the end.
It's just A benchmark and like all benchmarks it's a metric. As to why get the RAID card? It helps reduce CPU load and improves performance. It also improves reliability/stability. It helps when your RAID rebuilds.
@concerto49, that a normal Raid card can do as well, whats the use of high end cards.
The lower end ones don't have an actual RAID chip. It's emulated / passthrough, so might as well software RAID.
@concerto49, better, it is less chance of corruption too.
Everything has pros and cons.
Welcome to the matrix, I am pleased you could join us, everything you thought you knew was a lie