On 2015年12月03日 04:01, Somnath Roy wrote: > I think each write will create 2 objects (512 KB head object + rest of the contents) if your object size > 512KB. Also, it is writing some xattrs on top of what OSD is writing. Don't take my word blindly as I am not fully familiar with RGW:-) > This will pollute significant number of INODE I guess.. > But, I think the effect will be much more severe in case of RBD partial random write case. > > Thanks & Regards > Somnath The metadata flushing is really very expensive for a SATA HDD, and it goes worse for my small production cluster:( I tweak the WBThrottle options (specifically the param 'filestore_wbthrottle_xfs_inodes_start_flusher'), and finally, the OSD is no more suicided due to high disk usage. Hope your wonderful PR "writepath optimization" merged into master branch soon! Best Regards, flisky _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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