[ceph-users] Behavior of ceph-fuse when network is down

Yan, Zheng ukernel at gmail.com
Fri Nov 24 01:58:13 PST 2017


On Fri, Nov 24, 2017 at 4:59 PM, Zhang Qiang <dotslash.lu at gmail.com> wrote:
> Hi all,
>
> To observe what will happen to ceph-fuse mount if the network is down, we
> blocked
> network connections to all three monitors by iptables. If we restore the
> network
> immediately(within minutes), the blocked I/O request will be restored, every
> thing will
> be back to normal.
>
> But if we continue to block it long enough, say twenty minutes, ceph-fuse
> will not be
> able to restore. The ceph-fuse process is still there, but will not be able
> to handle I/O
> operations, df or ls will hang indefinitely.
>
> What is the retry policy of ceph-fuse? Is it normal for ceph-fuse to hang
> after the
> network blocking? If so, how can I make it restore to normal after the
> network is
> recovered? If it is not normal, what might be the cause? How can I help to
> debug this?

you can use 'kick_stale_sessions' ASOK command to make ceph-fuse
reconnect, or set  'client_reconnect_stale' config option to true.
Besides, you need to set mds config option
'mds_session_blacklist_on_timeout' to false.

>
> Thanks.
>
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>


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