Hi Kevin, I'm facing some issues on one of my nodes and I'm trying to find a way to fix that. CPU is used about 10% by user, and 80% for WIO. So I'm looking for a way to improve that. The mother board can do RAIDx and JBOD too. It's the server I used few weeks ago to run some disks benchs.
http://www.spaggiari.org/index.php/hbase/hard-drives-performances The conclusion was that RAID0 was 70% faster than JBOD. But JBOD was faster than RAID1. I have a 2TB drive in this server and was thinking about just adding another 2TB drive. What are the advantages of JBOD compared to RAID0? From the last tests I did, it was slower. Since I will have to re-format the disks anyway, I can re-run the tests just in case I did not configured something properly.... JM 2013/2/7, Kevin O'dell <[email protected]>: > Hey JM, > > Why RAID0? That has a lot of disadvantages to using a JBOD > configuration? Wait I/O is a symptom, not a problem. Are you actually > experiencing a problem or are you treating for something you think should > be lower? > > On Thu, Feb 7, 2013 at 8:19 PM, Jean-Marc Spaggiari > <[email protected] >> wrote: > >> Hi, >> >> What is an acceptable CPU_WIO % while running an heavy MR job? Should >> we also try to keep that under 10%? Or it's not realistic and we will >> see more about 50%? >> >> One of my nodes is showing 70% :( It's WAY to much. I will add another >> disk tomorrow and put them in RAID0, but I'm wondering how low shoud I >> go? >> >> JM >> > > > > -- > Kevin O'Dell > Customer Operations Engineer, Cloudera >
