Thread (9 messages) 9 messages, 4 authors, 2013-06-18

Re: RAID 5: low sequential write performance?

From: Corey Hickey <hidden>
Date: 2013-06-18 05:32:29

On 2013-06-17 10:45, Mikael Abrahamsson wrote:
On Mon, 17 Jun 2013, Corey Hickey wrote:
quoted
Is 256 really a reasonable default? Given what I've been seeing, it 
appears that 256 is either unreasonably low or I have something else 
wrong.
It's a safe setting for a low memory system. 1 megabyte per drive can 
probably be handled by most systems.

It's expected that you know how to tune this yourself, right now. I seem 
to remember Neil saying something a few years back about it being 
desireable for the stripe-cache to be auto-tuned depending on size of 
available RAM, but probably other things was higher priority plus it's not 
obvious exactly what the settings should be depending on how much RAM you 
have.
That would seem like a good thing.

Thanks,
Corey
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