> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Ali Ahsan
> Sent: Monday, May 09, 2011 1:52 PM
> To: centos@xxxxxxxxxx
> Subject: Re: kswapd taking 100% cpu with no swap on system
>
> On 05/09/2011 10:46 PM, Brunner, Brian T. wrote:
> >
> > 50GB in 0.12 ms is 500TB in 1.2 second.
> > SATA III buses at 6GB/sec need a "parallelness" of (nearly)
> > 100 channels to soak up that data.
> > How many drives must be written-to in parallel to sustain that write
> > rate is ... Beyond my math skills.
>
> Its only about Cassandra, not about my system :). SO whats your
> suggestion about SATA driver ?
My suggestion:
That (first) you check your facts.
What substantiates a claim of a 50GB/.12ms write-rate? What
environment?
The claim is (AIUI) utterly misleading. That (IMHO) gross
over-statement of Cassandra's write capacity makes any study of your
current system a pursuit after feral aquatic fowl.
I believe you were after an explanation as to why your kswapd was
running 100%? Lets stick to that and not drag in Cassandra vs MySQL.
Insert spiffy .sig here:
Life is complex: it has both real and imaginary parts.
//me
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