Re: SSD vs. HDD

2010-11-03 Thread Eric Rosenberry
Some comments inline... On Wed, Nov 3, 2010 at 1:44 PM, Jonathan Shook wrote: > SSDs are not reliable after a (relatively-low compared to spinning > disk) number of writes. > They may significantly boost performance if used on the "journal" > storage, but will suffer short lifetimes for highly-r

Re: Experiences with Cassandra hardware planning

2010-10-25 Thread Eric Rosenberry
I am going to respond to multiple questions in one email to keep down the thread insanity: On Mon, Oct 25, 2010 at 12:39 AM, David Dabbs wrote: > Sorry, Eric I’m not following you. You’ve set the JVM’s processor > affinity so it only runs on one of the processors? > My understanding is that Li

Re: Experiences with Cassandra hardware planning

2010-10-25 Thread Eric Rosenberry
Hey Chris- That is tough to say as we started out with no data and have been continuously loading data into the cluster. Initially we had less data than the amount of RAM in each node (48 gigs) but we have eventually exceeded that and now have many times more data on each node than in the entire

Re: Experiences with Cassandra hardware planning

2010-10-24 Thread Eric Rosenberry
l. > > > > Thanks, > > David > > > > From: Eric Rosenberry [mailto:epros...@gmail.com] > Sent: Sunday, October 24, 2010 10:17 PM > To: user@cassandra.apache.org > Subject: Experiences with Cassandra hardware planning > > All- > > Over the past ni

Experiences with Cassandra hardware planning

2010-10-24 Thread Eric Rosenberry
All- Over the past nine months I have been working to tune our hardware configuration to optimally balance CPU/RAM/disk/iops/network per node for our Cassandra workload. Thanks much to those here who have provided helpful advice. I wanted to share back to the community some of the learnings we h