Hi,all: I 'm dong tests with firefly 0.80.4,I want to test the performance with tools such as FIO,iozone?when I decided to test the rbd storage performance with fio,I ran commands on a client node as follows: rbd create img1 --size 1024 --pool data (this command went on well) rbd map img1 --pool data -id admin --keyring /etc/ceph/ceph.client.admin.keyring then unexpected thing happened,the client node crashed ,the screen showed messages that with: [ffffffffffffffffffffffffffff81077ae0]?flush_kthread _worker and many other messages like that. I have to stop the node and restart to make it work again. similary thing happed when I tried to mount ceph FS with kernel driver . I ran command as follows: mkdir /mnt/test mount -t ceph 192.168.50.191:/ /mnt/test -o name=admin,secret=AQATSKdNGBcwLhAAnNDKnH65FmVKpXZJVasUeQ== the node also crashed and can't work any more ,then I had to restart the node . I 'm puzzled about the problem,I wonder if the problem lies in my linux kernal or any other issues.Thanks for any help! my cluster are made up of one monitor ,six osds and a client. os:ubuntu 12.04 LTS ceph version:firefly 0.80.4 yours sincerely, ifstillfly -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140721/0b5a5425/attachment.htm>