On 08/08/2012 08:19 PM, Eric_YH_Chen@xxxxxxxxxx wrote:
Dear all:
My Environment: two servers, and 12 hard-disk on each server.
Version: Ceph 0.48, Kernel: 3.2.0-27
We create a ceph cluster with 24 osd, 3 monitors
Osd.0 ~ osd.11 is on server1
Osd.12 ~ osd.23 is on server2
Mon.0 is on server1
Mon.1 is on server2
Mon.2 is on server3 which has no osd
We create a rbd device and mount it as ext4 file system.
During read/write data on the rbd device, one of the storage server is shutdown by accident.
After reboot the server, we cannot access the rbd device any more.
One of the log shows the osdmap is corrupted.
Aug 5 15:37:24 ubuntu-002 kernel: [78579.998582] libceph: corrupt inc osdmap epoch 78 off 98 (ffffc9000177d07e of ffffc9000177d01c-ffffc9000177edf2)
We would like to know what kind of scenario would cause the corruption of osdmap and how to avoid it?
It seems that osdmap corruption cannot be recovered by the ceph cluster itself.
Is it the same issue with http://tracker.newdream.net/issues/2446?
In which version of kernel that we can find this patch? Thanks!
I'm not sure if it's the same issue, but looking at the Linux kernel
tree, it seems as though that fix is in v3.5-rc1
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