From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
To: "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: expected I/O / rand 4k iops
Date: Thu, 11 Apr 2013 09:27:12 +0200 [thread overview]
Message-ID: <516665D0.8080704@profihost.ag> (raw)
Hello list,
is there any calculation of expected I/O available?
I've a test system running 6 hosts 4 OSDs each using SSD - i get 20.000
to 40.000 IOP/s not as much as i expected but OK right now.
If i replace the SSDs on one host with spinning disks but still using
dedicated journal on ssd (20GB / Disk/OSDK), i'm not able to get more
than 300 to 400 iop/s this seems to be pretty low.
Everything tested using 0.56.4 and Qemu RBD.
Greets,
Stefan
next reply other threads:[~2013-04-11 7:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-11 7:27 Stefan Priebe - Profihost AG [this message]
2013-04-11 12:27 ` expected I/O / rand 4k iops Mark Nelson
2013-04-11 14:28 ` Stefan Priebe - Profihost AG
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