From: Olivier Bonvalet <ceph.list-PaEMFeTk6C1QFI55V6+gNQ@public.gmane.org>
To: ceph-users-Qp0mS5GaXlQ@public.gmane.org
Cc: ceph-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: More writes on blockdevice than on filestore ?
Date: Mon, 23 Mar 2015 14:22:42 +0100 [thread overview]
Message-ID: <1427116962.16770.26.camel@daevel.fr> (raw)
In-Reply-To: <1427116891.16770.25.camel-PaEMFeTk6C1QFI55V6+gNQ@public.gmane.org>
Erg... I sent to fast. Bad title, please read «More writes on
blockdevice than on filestore)
Le lundi 23 mars 2015 à 14:21 +0100, Olivier Bonvalet a écrit :
> 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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next prev parent reply other threads:[~2015-03-23 13:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-23 13:21 More writes on filestore than on journal ? Olivier Bonvalet
[not found] ` <1427116891.16770.25.camel-PaEMFeTk6C1QFI55V6+gNQ@public.gmane.org>
2015-03-23 13:22 ` Olivier Bonvalet [this message]
2015-03-23 14:29 ` [ceph-users] " Gregory Farnum
2015-03-23 14:35 ` Olivier Bonvalet
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