分布文件系统

Ceph是基于California大学存储系统研究中心研究成果的LGPL项目-v0.13 released



We’ve made a v0.13 release.　This mostly fixes bugs with v0.12 that have come up over the past couple weeks:



　 * [ku]lcient: fix sync read vs eof, lseek(…, SEEK_END)

　 * mds: misc bug fixes for multiclient file access



But also a few other big things:



　 * osd: stay active during backlog generation

　 * osdmap: override mappings (pg_temp)

　 * kclient: some improvements in kmalloc, memory preallocation



The OSD changes mean that the storage cluster can temporarily delegate authority for a placement group to the node that has the complete data while an index is being generated for recovery (that can take a while). Once that’s ready, control will fall back to the new/correct node and the usual recovery will kick in.



The disk format and wire protocols have changed with this version.



We’re continuing to work on the security infrastructure… hopefully will be ready for v0.14.



Here are the relevant URLs:



　 * Git tree at git://ceph.newdream.n