From: Zenon Panoussis <oracle@provocation.net>
To: ceph-devel@vger.kernel.org
Subject: Object size
Date: Thu, 28 Apr 2011 20:51:54 +0200 [thread overview]
Message-ID: <4DB9B74A.10806@provocation.net> (raw)
Hi
I'm trying to understand the relation between data size and actual
disk usage. With replication x2 I am seeing a 1:4.4 ratio according
to ceph (12222 MB data, 53579 MB used) and even more according to
'du -m' on the ext3 source of the ceph data (9791 MB instead of
12222 MB).
What is the current default object size? A paper from 2004 by Sage
et al speaks of 1 MB, a later one of 8 MB and
http://diaspora.gen.nz/~rodgerd/archives/1219-Ceph.html says 4 MB.
Is there a way to configure it? And is there any point in configuring
it (I am using ceph to store millions of small files) or would it
make no difference?
Z
next reply other threads:[~2011-04-28 18:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-28 18:51 Zenon Panoussis [this message]
2011-04-28 20:02 ` Object size Gregory Farnum
2011-04-28 23:55 ` Zenon Panoussis
2011-04-30 0:04 ` Gregory Farnum
2011-04-30 12:00 ` Zenon Panoussis
2011-05-02 16:09 ` Gregory Farnum
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