very slow postgresql startup - Mailing list pgsql-admin

Hi,

After stopping my pg server with pg_ctl -m immediate stop options it take hours to startup.

With vmstat I find hi pcu and io useages.

Any idea about this problem? I think it can be pg_xlog files.

How can I debug or trace this problem?

pg version is 9.4.5 running on centos 6.

Many thanks in advance.

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