Re: performance questions

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Hi,

	I am now occasionally seeing a ceph statuses like this:

		   health HEALTH_WARN 2 requests are blocked > 32 sec

	They aren't always present even though the cluster is still slow, but
they may be a clue....

Jeff

On Sat, Aug 17, 2013 at 02:32:47PM -0700, Sage Weil wrote:
> On Sat, 17 Aug 2013, Jeff Moskow wrote:
> > Hi,
> > 
> > 	When we rebuilt our ceph cluster, we opted to make our rbd storage 
> > replication level 3 rather than the previously configured replication 
> > level 2.
> > 
> > 	Things are MUCH slower (5 nodes, 13 osd's) than before even though 
> > most of our I/O is read.  Is this to be expected? What are the 
> > recommended ways of seeing who/what is consuming the largest amount of 
> > disk/network bandwidth?
> 
> It really doesn't sound like the replica count is the source of the 
> performance difference.  What else has changed?
> 
> sage

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