上週 Ceph cluster 掛掉，結果是某個 OSD 一直起不來。
在 /var/log/ceph/ceph-osd.X.log 裡面看到了以下錯誤訊息
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| ceph version 0.80.5 (38b73c67d375a2552d8ed67843c8a65c2c0feba6)
1: (FileStore::lfn_open(coll_t, ghobject_t const&, bool, std::tr1::shared_ptr<FDCache::FD>*, std::tr1::shared_ptr<CollectionIndex::Path>*, std::tr1::shared_ptr<CollectionIndex>*)+0x4e6) [0x888926]
2: (FileStore::_touch(coll_t, ghobject_t const&)+0x18b) [0x88effb]
3: (FileStore::_do_transaction(ObjectStore::Transaction&, unsigned long, int, ThreadPool::TPHandle*)+0x48f6) [0x899856]
4: (FileStore::_do_transactions(std::list<ObjectStore::Transaction*, std::allocator<ObjectStore::Transaction*> >&, unsigned long, ThreadPool::TPHandle*)+0x74) [0x89b204]
5: (JournalingObjectStore::journal_replay(unsigned long)+0x886) [0x8af6e6]
6: (FileStore::mount()+0x30c2) [0x883052]
7: (OSD::do_convertfs(ObjectStore*)+0x1a) [0x61a11a]
8: (main()+0x1d88) [0x602f98]
9: (__libc_start_main()+0xed) [0x7f70e698276d]
10: /usr/bin/ceph-osd() [0x607229]
NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.
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