-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Ali Ahsan Sent: Monday, May 09, 2011 1:52 PM To: centos@centos.org Subject: Re: [CentOS] 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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