Re: TOO SLOW data write speed and delete.. NEED HELP

[madhusudhana <madhusudhana.u.acharya@gmail.com>]

> I am yet to fully understand Ceph's behavior, thus you should not take my word 
on it, but I believe Ceph will
> automatically take snapshots as a checkpointing mechanism. So, until someone 
(*looks at Sage*)
> declares I am completely and utterly wrong, I'm going with that assumption.
> 
> Also, I am not sure if the slowdown you're suffering is Btrfs-related, but 
just in case...
> 
> > 
> > One more concern is 'rm' command is also TOO slow. I am a newbie here and 
> > i don't know to much about ceph working. I configured it in a simple way.
> > Install ceph and run mkcephfs and start ceph in all the servers in the 
> > cluster.
> > 
> > I want to understand why basic operations like 'cp' and 'rm' are slow bcz 
> > my actual workload does a lot of copy and delete operation. If I find the
> > reason for the slowness and get a fix, then I think i can better compare and 
> > complete my ceph evaluation. 
> 
> My follow up questions: 
> 
> - Are you copying into Ceph? From within Ceph, into Ceph? Or are you simply 
copying from Ceph to somewhere else?
Am copying data from a linux machine to ceph. Bot cp and rsync are really
really slow
> 
> - Under which conditions do these slowdowns happen? Are you performing *a lot* 
of cp's / rm's in a short
> amount of time?
Its doesn't matter whether i am doing cp/rm in a short. Whenever i run those 
commands they run really slow.
> 
> Cheers,
> Joao