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Invalid system activity (sysstat) file on Ubuntu server

I'm periodically getting this message from the daily cron on my server. (I don't get this message every day.) /etc/cron.daily/sysstat: Invalid system activity file: /var/log/sysstat//sa28 Here's ...
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139 views

High mysql server load, sar output

I have a MySQL Server that should be performing better than it seems to be. We're running ubuntu on a Amazon Cluster Compute (cc1.4xlarge) Linux ip-10-0-1-60 3.2.0-25-virtual #40-Ubuntu SMP Wed May ...