Hi,
I've been looking into increasing the performance of my ceph cluster for
openstack that will be moved in production soon. It's a full 1TB SSD
cluster with 16 OSD per node over 6 nodes.
As I searched for possible tweaks to implement, I stumbled upon
unitedstack's presentation at the openstack paris summit (video :
https://www.openstack.org/summit/openstack-paris-summit-2014/session-videos/presentation/build-a-high-performance-and-high-durability-block-storage-service-based-on-ceph).
Now, before implementing any of the suggested tweaks, I've been reading
up on each one. It's not that I don't trust everything that's being said
there, but I thought it may be better to inform myself before starting
to implement tweaks that may strongly impact the performance and
stability of my cluster.
One of the suggested tweaks is to set filestore_fiemap to true. The
issue is, after some research, I found that there is a rados block
device corruption bug linked to setting that option to true (link:
http://www.spinics.net/lists/ceph-devel/msg06851.html ). I have not
found any trace of that bug being fixed since, despite the mailing list
message being fairly old.
Is it safe to set filestore_fiemap to true?
Additionally, if anybody feels like watching the video or reading the
presentation (slides are at
http://www.spinics.net/lists/ceph-users/attachments/pdfUlINnd6l8e.pdf ),
what do you think of the part about the other tweaks and the data
durability part?
--
======================
Jean-Philippe Méthot
Administrateur système / System administrator
GloboTech Communications
Phone: 1-514-907-0050
Toll Free: 1-(888)-GTCOMM1
Fax: 1-(514)-907-0750
jpmethot@xxxxxxxxxx
http://www.gtcomm.net
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