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From Sergio <lapostadiser...@gmail.com>
Subject Re: Cassandra Recommended System Settings
Date Mon, 21 Oct 2019 17:20:51 GMT
Hello!

This is the kernel that I am using
Linux  4.16.13-1.el7.elrepo.x86_64 #1 SMP Wed May 30 14:31:51 EDT 2018
x86_64 x86_64 x86_64 GNU/Linux

Best,

Sergio

Il giorno lun 21 ott 2019 alle ore 07:30 Reid Pinchback <
rpinchback@tripadvisor.com> ha scritto:

> I don't know which distro and version you are using, but watch out for
> surprises in what vm.swappiness=0 means.  In older kernels it means "only
> use swap when desperate".  I believe that newer kernels changed to have 1
> mean that, and 0 means to always use the oomkiller.  Neither situation is
> strictly good or bad, what matters is what you intend the system behavior
> to be in comparison with whatever monitoring/alerting you have put in place.
>
> R
>
>
> ´╗┐On 10/18/19, 9:04 PM, "Sergio Bilello" <lapostadisergio@gmail.com> wrote:
>
>      Message from External Sender
>
>     Hello everyone!
>
>
>
>     Do you have any setting that you would change or tweak from the below
> list?
>
>
>
>     sudo cat /proc/4379/limits
>
>     Limit                     Soft Limit           Hard Limit
>  Units
>
>     Max cpu time              unlimited            unlimited
> seconds
>
>     Max file size             unlimited            unlimited
> bytes
>
>     Max data size             unlimited            unlimited
> bytes
>
>     Max stack size            unlimited            unlimited
> bytes
>
>     Max core file size        unlimited            unlimited
> bytes
>
>     Max resident set          unlimited            unlimited
> bytes
>
>     Max processes             32768                32768
> processes
>
>     Max open files            1048576              1048576
> files
>
>     Max locked memory         unlimited            unlimited
> bytes
>
>     Max address space         unlimited            unlimited
> bytes
>
>     Max file locks            unlimited            unlimited
> locks
>
>     Max pending signals       unlimited            unlimited
> signals
>
>     Max msgqueue size         unlimited            unlimited
> bytes
>
>     Max nice priority         0                    0
>
>     Max realtime priority     0                    0
>
>     Max realtime timeout      unlimited            unlimited            us
>
>
>
>     These are the sysctl settings
>
>     default['cassandra']['sysctl'] = {
>
>         'net.ipv4.tcp_keepalive_time' => 60,
>
>         'net.ipv4.tcp_keepalive_probes' => 3,
>
>         'net.ipv4.tcp_keepalive_intvl' => 10,
>
>         'net.core.rmem_max' => 16777216,
>
>         'net.core.wmem_max' => 16777216,
>
>         'net.core.rmem_default' => 16777216,
>
>         'net.core.wmem_default' => 16777216,
>
>         'net.core.optmem_max' => 40960,
>
>         'net.ipv4.tcp_rmem' => '4096 87380 16777216',
>
>         'net.ipv4.tcp_wmem' => '4096 65536 16777216',
>
>         'net.ipv4.ip_local_port_range' => '10000 65535',
>
>         'net.ipv4.tcp_window_scaling' => 1,
>
>            'net.core.netdev_max_backlog' => 2500,
>
>            'net.core.somaxconn' => 65000,
>
>         'vm.max_map_count' => 1048575,
>
>         'vm.swappiness' => 0
>
>     }
>
>
>
>     Am I missing something else?
>
>
>
>     Do you have any experience to configure CENTOS 7
>
>     for
>
>     JAVA HUGE PAGES
>
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.datastax.com_en_dse_5.1_dse-2Dadmin_datastax-5Fenterprise_config_configRecommendedSettings.html-23CheckJavaHugepagessettings&d=DwIBaQ&c=9Hv6XPedRSA-5PSECC38X80c1h60_XWA4z1k_R1pROA&r=OIgB3poYhzp3_A7WgD7iBCnsJaYmspOa2okNpf6uqWc&m=zke-WpkD1c6Qt1cz8mJG0ZQ37h8kezqknMSnerQhXuU&s=b6lGdbtv1SN9opBsIOFRT6IX6BroMW-8Tudk9qEh3bI&e=
>
>
>
>     OPTIMIZE SSD
>
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.datastax.com_en_dse_5.1_dse-2Dadmin_datastax-5Fenterprise_config_configRecommendedSettings.html-23OptimizeSSDs&d=DwIBaQ&c=9Hv6XPedRSA-5PSECC38X80c1h60_XWA4z1k_R1pROA&r=OIgB3poYhzp3_A7WgD7iBCnsJaYmspOa2okNpf6uqWc&m=zke-WpkD1c6Qt1cz8mJG0ZQ37h8kezqknMSnerQhXuU&s=c0S3S3V_0YHVMx2I-pyOh24MiQs1D-L73JytaSw648M&e=
>
>
>
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.datastax.com_en_dse_5.1_dse-2Dadmin_datastax-5Fenterprise_config_configRecommendedSettings.html&d=DwIBaQ&c=9Hv6XPedRSA-5PSECC38X80c1h60_XWA4z1k_R1pROA&r=OIgB3poYhzp3_A7WgD7iBCnsJaYmspOa2okNpf6uqWc&m=zke-WpkD1c6Qt1cz8mJG0ZQ37h8kezqknMSnerQhXuU&s=PZFG6SXF6dL5LRJ-aUoidHnnLGpKPbpxdKstM8M9JMk&e=
>
>
>
>     We are using AWS i3.xlarge instances
>
>
>
>     Thanks,
>
>
>
>     Sergio
>
>
>
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