From: Fyodor Ustinov <ufm@ufm.su>
To: ceph-devel@vger.kernel.org
Subject: increase duplication level decrease performance
Date: Mon, 4 Apr 2011 21:55:04 +0000 (UTC) [thread overview]
Message-ID: <loom.20110404T235336-22@post.gmane.org> (raw)
Hi.
ceph osd pool set data size 1
dd if=/dev/zero of=aaa bs=1024000 count=4000
4096000000 bytes (4.1 GB) copied, 31.3153 s, 131 MB/s
ceph osd pool set data size 2
4096000000 bytes (4.1 GB) copied, 72.7146 s, 56.3 MB/s
ceph osd pool set data size 3
4096000000 bytes (4.1 GB) copied, 136.263 s, 30.1 MB/s
Why? I thought increase in the number of copies should increase the
performance (in the worst case does not affect).
WBR,
Fyodor.
next reply other threads:[~2011-04-04 22:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-04 21:55 Fyodor Ustinov [this message]
2011-04-04 22:52 ` increase duplication level decrease performance Gregory Farnum
2011-04-04 23:28 ` Fyodor Ustinov
2011-04-04 23:36 ` Gregory Farnum
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