Hello Everyone If you see ceph day presentation delivered by Sebastien ( slide number 23 ) http://www.slideshare.net/Inktank_Ceph/ceph-performance
It looks like Firefly has dropped support to Journals , How concrete is this news ??? -Karan- On 14 Mar 2014, at 15:35, Jake Young <[email protected]> wrote: > You should take a look at this blog post: > > http://ceph.com/community/ceph-performance-part-2-write-throughput-without-ssd-journals/ > > The test results shows that using a RAID card with a write-back cache without > journal disks can perform better or equivalent to using journal disks with > XFS. > > As to whether or not it’s better to buy expensive controllers and use all of > your drive bays for spinning disks or cheap controllers and use some portion > of your bays for SSDs/Journals, there are trade-offs. If built right, > systems with SSD journals provide higher large block write throughput, while > putting journals on the data disks provides higher storage density. Without > any tuning both solutions currently provide similar IOP throughput. > > Jake > > > On Friday, March 14, 2014, Markus Goldberg <[email protected]> wrote: > Sorry, > i should have asked a little bit clearer: > Can ceph (or OSDs) be used without journals now ? > The Journal-Parameter seems to be optional ( because of '[...]' ) > > Markus > Am 14.03.2014 12:19, schrieb John Spray: > Journals have not gone anywhere, and ceph-deploy still supports > specifying them with exactly the same syntax as before. > > The page you're looking at is the simplified "quick start", the detail > on osd creation including journals is here: > http://eu.ceph.com/docs/v0.77/rados/deployment/ceph-deploy-osd/ > > Cheers, > John > > On Fri, Mar 14, 2014 at 9:47 AM, Markus Goldberg > <[email protected]> wrote: > Hi, > i'm a little bit surprised. I read through the new manuals of 0.77 > (http://eu.ceph.com/docs/v0.77/start/quick-ceph-deploy/) > In the section of creating the osd the manual says: > > Then, from your admin node, use ceph-deploy to prepare the OSDs. > > ceph-deploy osd prepare {ceph-node}:/path/to/directory > > For example: > > ceph-deploy osd prepare node2:/var/local/osd0 node3:/var/local/osd1 > > Finally, activate the OSDs. > > ceph-deploy osd activate {ceph-node}:/path/to/directory > > For example: > > ceph-deploy osd activate node2:/var/local/osd0 node3:/var/local/osd1 > > > In former versions the osd was created like: > > ceph-deploy -v --overwrite-conf osd --fs-type btrfs prepare > bd-0:/dev/sdb:/dev/sda5 > > ^^^^^^^^^^ Journal > As i remember defining and creating a journal for each osd was a must. > > So the question is: Are Journals obsolet now ? > > -- > MfG, > Markus Goldberg > > -------------------------------------------------------------------------- > Markus Goldberg Universität Hildesheim > Rechenzentrum > Tel +49 5121 88392822 Marienburger Platz 22, D-31141 Hildesheim, Germany > Fax +49 5121 88392823 email [email protected] > -------------------------------------------------------------------------- > > > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > -- > MfG, > Markus Goldberg > > -------------------------------------------------------------------------- > Markus Goldberg Universität Hildesheim > Rechenzentrum > Tel +49 5121 88392822 Marienburger Platz 22, D-31141 Hildesheim, Germany > Fax +49 5121 88392823 email [email protected] > -------------------------------------------------------------------------- > > > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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