Re: DS performance settings while multi-mastering

Rich Megginson <rmeggins@xxxxxxxxxx> · Thu, 21 Feb 2013 11:19:09 -0700



    On 02/21/2013 11:11 AM, Patrick
      Raspante wrote:

    
    I was mostly curious if the difference in cache
      configurations has any negative effect on the integrity of the
      replication agreement between the directory instances.

      
      To illustrate, say one directory instance is managing several root
      suffixes and has increased cache settings. The other instance has
      default settings. The default instance is perfectly capable of
      operating on the replicated data-set and/or doesn't have the
      performance requirements of the other instance.

    
    It depends where your requests are going.  If all of your servers
    have an equal request load, then it makes sense to have the same
    cache settings on all of your servers.

    
    But I strongly encourage you to use the tool below to monitor your
    usage.  Depending on your platform, how much RAM you have, how many
    entries you have, etc.  you may need to decrease your cache settings
    to save RAM, or increase to cache more entries.  To emphasize what
    David Boreham said, if you can easily cache everything in RAM, in db
    cache and entry/dn caches, then that will give you the very best
    performance.  Otherwise, better to let the OS file system cache work
    for you.

    
      Thanks,

      Patrick

      
      On Thu, Feb 21, 2013 at 12:39 PM, Rich
        Megginson <rmeggins@xxxxxxxxxx>
        wrote:

        
              On 02/21/2013 08:27 AM, Patrick Raspante wrote:

              
              Is it required (or at least
                suggested) that multi-mastered directory server
                instances have the equal values for dbcache and entry
                cache settings? If so, what adverse effects result from
                not configuring the caches similarly?

              
            There is a tool which you can use to monitor the caches:

            
            https://github.com/richm/scripts/wiki/dbmon.sh

            https://github.com/richm/scripts/blob/master/dbmon.sh

            
              Thanks,

              pwr
              

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