[sheepdog-users] about snapshot and backup

[Hitoshi Mitake]

At Tue, 20 Aug 2013 15:32:04 +0200,
Valerio Pachera wrote:

Hi Valerio,

> 
> Sheepdog daemon version 0.6.1
> 
> # collie vdi list
>   Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag
>   big          0   50 GB  0.0 MB  0.0 MB 2013-08-20 14:16   4fd259
> 2
>   wheezy_template     0   10 GB  4.5 GB  0.0 MB 2013-08-20 11:31
> 5ddf88     2
> s small        2  1.0 GB  148 MB  552 MB 2013-08-20 14:39   98998d
> 2
> s small        3  1.0 GB  136 MB  564 MB 2013-08-20 15:09   98998e
> 2
> s small        4  1.0 GB  144 MB  556 MB 2013-08-20 15:09   98998f
> 2
> s small        5  1.0 GB  132 MB  568 MB 2013-08-20 15:10   989990
> 2
> s small        6  1.0 GB   44 MB  660 MB 2013-08-20 15:10   989991
> 2
>   small        0  1.0 GB  0.0 MB  704 MB 2013-08-20 15:17   989992     2
> 
> # qemu-img convert -O qcow2 sheepdog:small:2 backup/small_bkp.qcow2
> # collie vdi backup -s 3 -F 2 small > backup/snap_2_3.img
> # collie vdi backup -s 4 -F 3 small > backup/snap_3_4.img
> # collie vdi backup -s 5 -F 4 small > backup/snap_4_5.img
> 
> # ls -lh backup/
> totale 7,4M
> -rw-r--r-- 1 root root 7,4M ago 20 15:26 small_bkp.qcow2
> -rw-r--r-- 1 root root  29K ago 20 15:15 snap_2_3.img
> -rw-r--r-- 1 root root  54K ago 20 15:16 snap_3_4.img
> -rw-r--r-- 1 root root  26K ago 20 15:17 snap_4_5.img
> 
> root at test004:~# collie vdi delete -s 5 small
> root at test004:~# collie vdi delete -s 4 small
> root at test004:~# collie vdi delete -s 3 small
> root at test004:~# collie vdi delete -s 2 small
> root at test004:~# collie vdi delete  small
> 
> RESTORE
> 
> qemu-img convert -f qcow2 backup/small_bkp.qcow2 sheepdog:small
> ...
> qemu-img: cannot find aio_req 0
> qemu-img: cannot find aio_req 0
> qemu-img: cannot find aio_req 0
> qemu-img: cannot find aio_req 0
> qemu-img: cannot find aio_req 0
> qemu-img: cannot find aio_req 0
> ...
> 
> sheep.log
> 
> Aug 20 15:29:07 [gway 19865] add_to_lru_cache(721) PANIC: the object
> already exist
> Aug 20 15:29:07 [gway 19865] crash_handler(180) sheep exits
> unexpectedly (Aborted).
> Aug 20 15:29:07 [gway 19865] sd_backtrace(845) sheep.c:182: crash_handler
> Aug 20 15:29:07 [gway 19865] sd_backtrace(859)
> /lib/x86_64-linux-gnu/libpthread.so.0(+0xf02f) [0x7fe9faf8402f]
> Aug 20 15:29:07 [gway 19865] sd_backtrace(859)
> /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x34) [0x7fe9fa590474]
> Aug 20 15:29:07 [gway 19865] sd_backtrace(859)
> /lib/x86_64-linux-gnu/libc.so.6(abort+0x17f) [0x7fe9fa5936ef]
> Aug 20 15:29:07 [gway 19865] sd_backtrace(845) object_cache.c:721:
> add_to_lru_cache
> Aug 20 15:29:07 [gway 19865] sd_backtrace(845) object_cache.c:771:
> object_cache_lookup
> Aug 20 15:29:07 [gway 19865] sd_backtrace(845) object_cache.c:1130:
> object_cache_handle_request
> Aug 20 15:29:07 [gway 19865] sd_backtrace(845) ops.c:1385: do_process_work
> Aug 20 15:29:07 [gway 19865] sd_backtrace(845) work.c:243: worker_routine
> Aug 20 15:29:07 [gway 19865] sd_backtrace(859)
> /lib/x86_64-linux-gnu/libpthread.so.0(+0x6b4f) [0x7fe9faf7bb4f]
> Aug 20 15:29:07 [gway 19865] sd_backtrace(859)
> /lib/x86_64-linux-gnu/libc.so.6(clone+0x6c) [0x7fe9fa638a7c]
> Aug 20 15:29:07 [gway 19865] dump_stack_frames(755) cannot find gdb
> Aug 20 15:29:07 [gway 19865] __sd_dump_variable(709) cannot find gdb
> Aug 20 15:29:07 [main] crash_handler(487) sheep pid 19051 exited unexpectedly.
> 
> ---
> 
> My intention was to restore the snapshot once restored the vdi but I
> didn't get there.

Thanks for your reporting. I'll look this problem.

> 
> By the way, I think the files I got from 'vdi backup' are way to small.
> So I doubt it would have worked out.

Can I see the actual sizes of the disks?

Thanks,
Hitoshi