Thanks all for the suggestions. Our storage nodes have plenty of RAM and their only purpose is to host the OSD daemons, so we will not create a swap partition on provisioning.
For the OS disk we will then use a software raid 1 to handle eventually disk failures. For provisioning the hosts we use kickstart and then Ansible to install an prepare the hosts to be ready to for ceph-deploy. Thanks all for our opinions and suggestions helped a lot. Best, Martin On Sat, Sep 19, 2015 at 6:14 AM, Robert LeBlanc <[email protected]> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > If you decide to use swap, be warned that significant parts of the OSD > code can be swapped out even without memory pressure. This has caused > OSD processes to take 5 minutes to shut down in my experience. I would > recommend tuning swappiness in this case. My strongest recommendation > is not to have swap if it is a pure OSD node. > - ---------------- > Robert LeBlanc > PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 > > > On Fri, Sep 18, 2015 at 8:15 PM, 张冬卯 wrote: > > yes, a raid1 system disk is necessary, from my perspective. > > > > And a swap partition is still needed even though the memory is big. > > Martin Palma 于 2015年9月18日，下午11:07写道： Hi, > > > > Is it a good idea to use a software raid for the system disk (Operating > > System) on a Ceph storage node? I mean only for the OS not for the OSD > > disks. > > > > And what about a swap partition? Is that needed? > > > > Best, > > Martin > > > > _______________________________________________ > > ceph-users mailing list > > [email protected] > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > -----BEGIN PGP SIGNATURE----- > Version: Mailvelope v1.1.0 > Comment: https://www.mailvelope.com > > wsFcBAEBCAAQBQJV/OEjCRDmVDuy+mK58QAAzWMQAI/sVjPQP+sJPPAl/7lq > r75SccEO5i7rGZuTrrDn6kl1p2Nackb9o0PKh0tnyOSgouO2Jj3IOvqlnv/S > t40SxkoDoaG2//JmBHZs2BtOUWQCBh4R9h5UjwROXvByKBCNzzH+tsrJ4cST > 7HdVNB3Cjg/kcxC7kB88OOF1Kl8mrPSsbb9kG1RSlqqCFh82pZ3GJjDpNP30 > mCQHMcTWwlYoAx+5Lii0cCks5Csc78BAv7gFtv47NAvXyRT5LPN8ZvXYv71N > Bm5pqkIC5H38nVrTb9UCyrVdFmL7M9FeaEaJ+CvNOZFYVgjrAUWNw0LGAgey > yAH9q8GHEJAmvtZLWebCXMucLmNM6LUDySuxgN2sx8upNFg57Zwz8zLFmitp > mvp8YdWS+blSk8gyMWFMLUbtIPu6QepzYGpY5lKy6HJI4pqzd5g8HK9gIjjO > 0EY330T7KE03HjQS4Nuj3xmSWeY5lOQ1sSMANBACXLtDpgTQ8/rQpni9DQBP > VHyk0t3DWwE83MbF6T8o1h+vS06BIeVc4mOehAxvmsSMITmORejJmLQtu3sS > bUEWDZS7KcVPj0/FIqGJbf4d7CIYKfDouNUb1J2aXjz9YwK9CbfFZzHbGIfT > gKsgbL8wHsHNIjOlQVbvSgJ+CjRz6H7xO3hHVUrYL4pXLjSt+VJodfB7azlk > 8Dq9 > =ny7s > -----END PGP SIGNATURE----- >
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