On 16/07/19 3:16 PM, Gionatan Danti wrote:
Hi list,
I have a replica 3 test cluster and I have a question about how
clients behave to an host shutdown.
If I suddenly switch off one of the gluster server, the connected
clients see a ~42s stall in I/O: this is expected, as it is the
default client timeout.
However, it is possible to *gracefully* shutdown a running gluster
server, *without* impacting a running client? Ie: putting the affected
server in a "maintenance mode" of sort.
Yes, if you simply pkill the gluster brick processes of the node before
switching it off, you won't observe the hang on the clients because they
will receive the disconnect notification immediately. But before that,
you would need to check if there are no pending heals etc. You can use
the script [1] which does all these checks in the graceful mode.
HTH,
Ravi
[1]
https://github.com/gluster/glusterfs/blob/master/extras/stop-all-gluster-processes.sh
Thanks.
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