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Dell PowerStore: MongoDB Solution Guide
Executive summary Introduction Considerations Preparing PowerStore appliance for MongoDB deployment MongoDB installation and configuration
Operating system tuning
Multipath I/O
File system
Space reclamation
MongoDB installation
MongoDB Replica Set configuration
WiredTiger storage engine
Data reduction study of PowerStore and MongoDB Test methodology and results Data protection References

Operating system tuning

Home > Storage > PowerStore > Databases and Data Analytics > Dell PowerStore: MongoDB Solution Guide > Operating system tuning

Operating system tuning

  • This paper focuses on Red Hat based operating systems. MongoDB recommends adjusting the following configuration on the Linux operating system.

    1. Modify the operating system user limits for the mongod user. Create the /etc/security/limits.d/99-mongod.conf file with the following lines.

    mongod  soft    nofile  64000

    mongod  hard    nofile  64000

    mongod  soft    nproc   64000

    mongod  hard    nproc   64000

    mongod  soft    memlock unlimited

    mongod  hard    memlock unlimited

    1. To disable transparent hugepages, append the following to the GRUB_CMDLINE_LINUX line in the /etc/default/grub file.

    transparent_hugepage=never

    1. Reboot the system.
    2. To disable NUMA, use one of the following methods.
    • Disable NUMA on the BIOS on a physical server. This method does not apply to the PowerStore X model internal ESXi nodes.
    • Disable vNUMA on a VM.
    • If hot-add CPU is enabled on a VM, it automatically disables the vNUMA feature for that VM.
    • If NUMA is not disabled, start the mongod process with the following numactl command that would achieve similar effect of turning off numa.

    # numactl --interleave=all mongod -f /etc/mongod.conf

    1. Depending on your MongoDB settings, you might also need to adjust the Linux parameters. The following lists a few of these parameters.
    • fs.file-max
    • kernel.pid_max
    • kernel.threads-max
    • vm.map_map_count
    • vm.zone_reclaim_mode
    • vm.swappiness
    • net.ipv4.tcp_keepalive_time

    To review and adjust Linux kernel parameters, run sysctl -p to list all current values. To override any parameter, define the new value in /etc/sysctl.conf or /etc/sysctl.d/${parameter file}. Reload the sysctl file or reboot the system. For more information about MongoDB settings, see the MongoDB documentation.