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plesk 9, knowledge base

When domain count reaches ~300 then many of services can stop working. e.g. apache. The reason for that is a huge amount of open file descriptors in apache. So Plesk starts to use pipeloging for apache logs. The idea is that all log records are piped to one binary program, which will open corresponding domain log file. Unfortunaly, such mechanism can be applied for access_log only, not for error_log.
I think that pipelog enabling will help you. Or just separate domains to different servers.
 
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