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From: Olivier Bonvalet <ceph.list@daevel.fr>
To: ceph-users@ceph.com
Cc: ceph-devel@vger.kernel.org
Subject: More writes on filestore than on journal ?
Date: Mon, 23 Mar 2015 14:21:31 +0100	[thread overview]
Message-ID: <1427116891.16770.25.camel@daevel.fr> (raw)

Hi,

I'm still trying to find why there is much more write operations on
filestore since Emperor/Firefly than from Dumpling.

So, I add monitoring of all perf counters values from OSD.

From what I see : «filestore.ops» reports an average of 78 operations
per seconds. But, block device monitoring reports an average of 113
operations per seconds (+45%).
please thoses 2 graphs :
- https://daevel.fr/img/firefly/osd-70.filestore-ops.png
- https://daevel.fr/img/firefly/osd-70.sda-ops.png

Do you see what can explain this difference ? (this OSD use XFS)

Thanks,
Olivier

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             reply	other threads:[~2015-03-23 13:21 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-23 13:21 Olivier Bonvalet [this message]
     [not found] ` <1427116891.16770.25.camel-PaEMFeTk6C1QFI55V6+gNQ@public.gmane.org>
2015-03-23 13:22   ` More writes on blockdevice than on filestore ? Olivier Bonvalet
2015-03-23 14:29 ` [ceph-users] More writes on filestore than on journal ? Gregory Farnum
2015-03-23 14:35   ` Olivier Bonvalet

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