[users@httpd] Apache creates Semaphore

Hi, Semaphore is used in multi process environment to share resources within processes. But when I am starting apache in debug mode i:e single process then still it creates semaphore. May I know the reason why it is creating semaphore in debug mode also. Thanks Hemant

[users@httpd] Apache "marking down" a back-end server

Hello Everyone, I am seeing one interesting behavior of Apache httpd. We have multiple Apache httpds in front of set of Tomcat JVMs. I found that sometimes *one of the httpds marking one of the JVMs down* for 180 Sec("retry" value). As a result, users logged on that JVM are getting 5xx error.