On Tue, Jul 22, 2014 at 5:19 PM, Wido den Hollander <w...@42on.com> wrote: > Hi, > > Currently on Ubuntu with Upstart when you invoke a restart like this: > > $ sudo restart ceph-osd-all > > It will restart all OSDs at once, which can increase the load on the system > a quite a bit. > > It's better to restart all OSDs by restarting them one by one: > > $ sudo ceph restart ceph-osd id=X > > But you then have to figure out all the IDs by doing a find in > /var/lib/ceph/osd and that's more manual work. > > I'm thinking of patching the init scripts which allows something like this: > > $ sudo restart ceph-osd-all delay=180 > > It then waits 180 seconds between each OSD restart making the proces even > smoother. > > I know there are currently sysvinit, upstart and systemd scripts, so it has > to be implemented on various places, but how does the general idea sound? > > -- > Wido den Hollander > Ceph consultant and trainer > 42on B.V. > > Phone: +31 (0)20 700 9902 > Skype: contact42on > --
Hi, this behaviour obviously have a negative side of increased overall peering time and larger integral value of out-of-SLA delays. I`d vote for warming up necessary files, most likely collections, just before restart. If there are no enough room to hold all of them at once, we can probably combine both methods to achieve lower impact value on restart, although adding a simple delay sounds much more straight than putting file cache to ram. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
