How to move OSD form 1TB disk to 2TB disk

[wsnote <wsnote@xxxxxxx>]

I know another way: out 1TB osd, up 2TB osd as osd.X without data, then rados will backfill the data to 2TB disks.

Now I use rsync to mv data form 1TB disk to 2TB disk, but the new osd coredump.

What's the problem?

ceph version:0.80.1

osd.X 

host1 with 1TB disks

host2 with 2TB disks

on host1:

osd.X down

ceph-osd -i X --flush-journal

rsync -av /data/osd/osd.X/ root:host2:/data/osd/osd.X/  

on host2:

vim ceph.conf

ceph-osd -i X --mkjournal

ceph-osd -i X

then osd.X coredump

osd log:
-1> 2015-09-19 14:52:22.371149 7f008cd007a0 0 osd.29 416 load_pgs
0> 2015-09-19 14:52:22.378677 7f008cd007a0 -1 osd/PG.cc: In function 'static epoch_t PG::peek_map_epoch(ObjectStore*, coll_t, hobject_t&, ceph::bufferlist*)' thread 7f008cd007a0 time 2015-09-19 14:52:22.377569
osd/PG.cc: 2559: FAILED assert(r > 0)

ceph version 0.80.1 (a38fe1169b6d2ac98b427334c12d7cf81f809b74)
1: (PG::peek_map_epoch(ObjectStore*, coll_t, hobject_t&, ceph::buffer::list*)+0x48d) [0x7fa4ad]
2: (OSD::load_pgs()+0x18f1) [0x63c771]
3: (OSD::init()+0x22b0) [0x6550e0]
4: (main()+0x359e) [0x5f931e]
5: (__libc_start_main()+0xfd) [0x3073c1ed5d]
6: ceph-osd() [0x5f59c9]

coredump:
(gdb) bt

0 0x000000307400f5db in raise () from /lib64/libpthread.so.0

1 0x00000000009ab7f4 in ?? ()

2 <signal handler called>

3 0x0000003073c32635 in raise () from /lib64/libc.so.6

4 0x0000003073c33e15 in abort () from /lib64/libc.so.6

5 0x0000003b4febea7d in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib64/libstdc++.so.6

6 0x0000003b4febcbd6 in ?? () from /usr/lib64/libstdc++.so.6

7 0x0000003b4febcc03 in std::terminate() () from /usr/lib64/libstdc++.so.6

8 0x0000003b4febcd22 in __cxa_throw () from /usr/lib64/libstdc++.so.6

9 0x0000000000aec612 in ceph::__ceph_assert_fail(char const*, char const*, int, char const*) ()

10 0x00000000007fa4ad in PG::peek_map_epoch(ObjectStore*, coll_t, hobject_t&, ceph::buffer::list*) ()

11 0x000000000063c771 in OSD::load_pgs() ()

12 0x00000000006550e0 in OSD::init() ()

13 0x00000000005f931e in main ()

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