Thx! Am 17.01.2013 um 17:24 schrieb Sébastien Han <han.sebastien@xxxxxxxxx>: > Hi Stephan, > >> - Increase the osdmax value > > Well actually this doesn't seem to be necessary because when you issue > a "ceph osd create" the osdmax value is automatically incremented. It > just that a while ago I saw on the ML or IRC that it was a good > practice to do this. And this documentation > http://ceph.com/docs/master/rados/operations/control/ says: > > "Set the max_osd parameter in the osd map. This is necessary when > expanding the storage cluster." > > Maybe the doc is outdated on this option, I don't know. > >> - Set “filestore flusher” option to false, in your [osd] section > > During my benchmarks sessions I noticed that disabling this option > brought way better performance, at least for old hardware. Fo recent > hardware I haven't seen any difference, but I kept the habit to > disable it. There are some discussions about this option on the ML. As > far as I can remember, it's harmless to disable it. > From the doc here > http://ceph.com/docs/master/rados/configuration/filestore-config-ref/: > > "The filestore flusher forces data from large writes to be written out > using sync file range before the sync in order to (hopefully) reduce > the cost of the eventual sync. In practice, disabling ‘filestore > flusher’ seems to improve performance in some cases." > > Cheers, > > -- > Regards, > Sébastien Han. > > > On Wed, Jan 16, 2013 at 7:41 PM, Stefan Priebe <s.priebe@xxxxxxxxxxxx> wrote: >> >> Hello Sebastien, >> hello list, >> >> first nice article sebastien ;-) thanks for contributing. >> >> I've two question regarding the tips: >> >> Can somebody explain me why i should do this?: >> - Increase the osdmax value >> - Set “filestore flusher” option to false, in your [osd] section >> >> Greets, >> Stefan >> -- >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
