How to increase the number of semaphores
Issue
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Need to increase semaphore array limits for Apache httpd
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Need to increase maximum number of semaphore sets for a 3rd-party application
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IBM DB2 database instances goes down with error "Requesting too many semaphores"
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A Red Hat Enterprise Linux Server running a large program, such as a database crashes after about a day or so of running. Using the 'ipcs' command it was determined that the server crashes once 100 out of 128 semaphores have been used.
[root@rhel6 ~]# ipcs -s ------ Semaphore Arrays -------- key semid owner perms nsems 0x00000000 0 root 600 1 0x00000000 65537 root 600 1 0xdd3adabd 131074 user 600 1
Environment
- Red Hat Enterprise Linux 4
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
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