Yesterday I upgraded our DPM head node from UMD-1 (DPM 1.8.3) to EMI-2
(DPM 1.8.5). The upgrade appeared to be successful, but since then the
load average on the SE has stayed stubbornly above 2 (prior to the
upgrade it rarely exceeded 0.2). The SE is working (all Nagios tests are
passing and I can see no obvious errors in the logs), but some transfers
are failing due to timeouts (so ATLAS opened a ticket overnight).
I tried increasing innodb_buffer_pool_size in /etc/my.cnf and this may
have helped at the 10-20% level. The most active process is often
srmv2.2, but I can't find any discussion of a need to tune it. Any
pointers on how to debug this behaviour would be welcome.
John
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