From mboxrd@z Thu Jan  1 00:00:00 1970
From: madhusudhana <madhusudhana.u.acharya@gmail.com>
Subject: Re: TOO SLOW data write speed and delete.. NEED HELP
Date: Wed, 14 Mar 2012 04:28:24 +0000 (UTC)
Message-ID: <loom.20120314T052312-964@post.gmane.org>
References: <loom.20120313T113524-750@post.gmane.org> <4F5FA114.7070806@gmail.com>
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Jo=C3=A3o Eduardo Lu=C3=ADs <jecluis <at> gmail.com> writes:

>=20
> On 03/13/2012 10:39 AM, madhusudhana wrote:
> > Hi all,
> > Can someone PLEASE help me to understand why data copying (simple c=
p
> > or rsync) is SO slow in CEPH ? And delete command (\rm -rf) for rem=
oving
> > a small (175M) directory is taking so much of time. Because of this=
,
> > i am not able to complete evaluation of ceph using my actual worklo=
ad.=20
> >=20
> > I am hereby requesting all to help me in finding out the reason for=
=20
> > slow write/delete in my ceph cluster. I am really trying hard to=20
> > complete the evaluation with actual workload but not able to copy t=
he
> > data whats required for evaluation to ceph cluster bcz of slow copy=
=2E
> >=20
> > I really appreciate any help on this.
> >=20
> > Thanks in advance
> > Madhusudhan
> >=20
>=20
> Hi Madhusudhan,
>=20
> Are you using Btrfs? And are you taking snapshots while you're
> performing those operations?
>=20
Joao,
Yes. all my OSD's are running on btrfs. I am not doing anything special
except running 'cp' or 'rsync' command. can you please let me know how
i can find if am taking snapshots while I do 'cp' or 'rsync' commands ?

One more concern is 'rm' command is also TOO slow. I am a newbie here a=
nd=20
i don't know to much about ceph working. I configured it in a simple wa=
y.
Install ceph and run mkcephfs and start ceph in all the servers in the=20
cluster.

I want to understand why basic operations like 'cp' and 'rm' are slow b=
cz=20
my actual workload does a lot of copy and delete operation. If I find t=
he
reason for the slowness and get a fix, then I think i can better compar=
e and=20
complete my ceph evaluation.=20

Thanks



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