Google’s Project Fi – how to select which carrier is used

If you own a Pixel or Nexus device, Google’s Project Fi is a wonderful alternative for cellular service outside of the four major US carriers. Project Fi is a Google managed MVNO, providing service primarily through T-Mobile and Sprint networks within the USA. […]


RHEL / CentOS 7 – Changing available Linux kernel memory

To modify the amount of memory available to the Linux kernel modify grub settings and reboot the server. RHEL 7 and CentOS 7 now uses grub2 which auto-generates boot files. Custom changes should be placed in  /etc/default/grub or /etc/grub.d/40_custom How […]


Monitoring drive health using S.M.A.R.T

S.M.A.R.T – Self-Monitoring, Analysis and Reporting Technology can be used to monitor and report on the health of storage devices attached to JBOD drive controller. Each storage device maintains SMART counters that can provide detailed information on the status of each […]


Smartmontools for SCSI devices

Smartmontools for SCSI devices Douglas Gilbert <dgilbert�at�interlog�dot�com> Copyright � 2003, 2004, 2005, 2006 Douglas Gilbert Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version […]


Memory Modules DIMM, RDIMM, LRDIMM performance

This post addresses memory architectures for Intel Xeon SP (CoffeeLake, Skylake) and Intel Xeon (Haswell, Ivybridge, and Sandybridge) CPUs. Overall server performance is affected by the memory subsystem which can provide both high memory bandwidth and low memory access latency […]