Am 12.04.2016 um 12:09 schrieb Florian Haas: > On Tue, Apr 12, 2016 at 11:53 AM, Simon Ferber > <ferber@xxxxxxxxxxxxxxxxxxxxxxxx> wrote: >> Thank you! That's it. I have installed the Kernel from the Jessie >> backport. Now the crashes are gone. >> How often do these things happen? It would be a worst case scenario, if >> a system update breaks a productive system. > > For what it's worth, what you saw is kernel (i.e. client) side > breakage. You didn't mess up your Ceph cluster, nor your CephFS > metadata, nor any data. Also, anything you do in CephFS using a > release before Jewel must be considered experimental, and while things > will generally not break even on the client, you shouldn't be > surprised if they do. Thirdly, my recommendation for any Ceph > client-side kernel functionality (both rbd.ko and CephFS) would be to > use nothing older than a 4.x kernel. Thank you for clarification, Florian. > > A good update on the current state of CephFS is this tech talk, which > John Spray did in February: > > https://www.youtube.com/watch?v=GbdHxL0vc9I > slideshare.net/JohnSpray1/cephfs-update-february-2016 > > Also, please don't ever do this: > > cluster 2a028d5e-5708-4fc4-9c0d-3495c1a3ef3d > health HEALTH_OK > monmap e2: 2 mons at > {ollie2=129.217.207.207:6789/0,stan2=129.217.207.206:6789/0} > election epoch 12, quorum 0,1 stan2,ollie2 > mdsmap e10: 1/1/1 up {0=ollie2=up:active}, 1 up:standby > osdmap e72: 8 osds: 8 up, 8 in > flags sortbitwise > pgmap v137: 428 pgs, 4 pools, 2396 bytes data, 20 objects > 281 MB used, 14856 GB / 14856 GB avail > 428 active+clean > > 2 mons. Never, and I repeat never, run your Ceph cluster with 2 mons. > You want to run 3. Thus if there are two servers only (which used to use drdb) what would be the best solution? Just grab another Linux server and install a ceph cluster node without OSDs and a monitor only? Best Simon > > Cheers, > Florian > -- Simon Ferber Techniker Technische Universität Dortmund Fakultät Statistik Vogelpothsweg 87 44227 Dortmund Tel.: +49 231-755 3188 Fax: +49 231-755 5305 simon.ferber@xxxxxxxxxxxxxx www.tu-dortmund.de Wichtiger Hinweis: Die Information in dieser E-Mail ist vertraulich. Sie ist ausschließlich für den Adressaten bestimmt. Sollten Sie nicht der für diese E-Mail bestimmte Adressat sein, unterrichten Sie bitte den Absender und vernichten Sie diese Mail. Vielen Dank. Unbeschadet der Korrespondenz per E-Mail, sind unsere Erklärungen ausschließlich final rechtsverbindlich, wenn sie in herkömmlicher Schriftform (mit eigenhändiger Unterschrift) oder durch Übermittlung eines solchen Schriftstücks per Telefax erfolgen. Important note: The information included in this e-mail is confidential. It is solely intended for the recipient. If you are not the intended recipient of this e-mail please contact the sender and delete this message. Thank you. Without prejudice of e-mail correspondence, our statements are only legally binding when they are made in the conventional written form (with personal signature) or when such documents are sent by fax. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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