Tag: linux

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Octa-core Cortex-A53 hacker SBC sells for $60


FriendlyARM’s $60, open spec “NanoPC-T3” SBC runs Android or Linux on an octa-core Cortex-A53 SoC packed with wireless and media interfaces, plus 8GB eMMC.

The 100 x 60mm NanoPC-T3 is essentially a NanoPC-T2 with a faster processor and a 2GB RAM option in addition to the standard 1GB. The SBC is further equipped with 8GB of eMMC and an SD slot. You also get GbE, WiFi, Bluetooth 4.0, four USB host ports, and a micro-USB client port. Media ports include HDMI, LVDS, LCD, MIPI-DSI, MIPI-CSI, and audio.

Source: Octa-core Cortex-A53 hacker SBC sells for $60

Some SBC goodness for those processor intense DIY projects out there. Very cool that it’ll run either Android or Linux. FriendlyARM also sells an array of  certified externals to help get things up and running. See http://elide.us/9K to order yours.

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Microsoft ports SQL Server to Linux

The new Microsoft has placed an increased importance on the cloud, and with other companies following suit, reliance on server solutions has increased.  Today the company announces that it is bringing SQL Server to Linux.

Both cloud and on-premises versions will be available, and the news has been welcomed by the likes of Red Hat and Canonical. Although the Linux port of SQL Server is not due to make an appearance until the middle of next year, a private preview version is being made available to testers from today.

— Microsoft brings SQL Server to Linux | BetaNews

This is a big deal, even though it isn’t open source. It is Microsoft acknowledging the increasing dominance of Linux in the data center.

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Netflix shows how they get a high level look at Linux in 60 seconds

In 60 seconds you can get a high level idea of system resource usage and running processes by running the following ten commands. Look for errors and saturation metrics, as they are both easy to interpret, and then resource utilization. Saturation is where a resource has more load than it can handle, and can be exposed either as the length of a request queue, or time spent waiting.

uptime
dmesg | tail
vmstat 1
mpstat -P ALL 1
pidstat 1
iostat -xz 1
free -m
sar -n DEV 1
sar -n TCP,ETCP 1
top

Some of these

commands

  require the sysstat package installed. The metrics these commands expose will help you complete some of the USE Method: a methodology for locating performance bottlenecks. This involves checking utilization, saturation, and error metrics for all resources (CPUs, memory, disks, e.t.c.). Also pay attention to when you have checked and exonerated a resource, as by process of elimination this narrows the targets to study, and directs any follow on investigation. 

The Netflix Tech Blog: Linux Performance Analysis in 60,000 Milliseconds http://techblog.netflix.com/2015/11/linux-performance-analysis-in-60s.html

Lots of good info here, though I suspect many sys admins already run through most of this once they land on a box.