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Archive for the '*nix' Category

Drive clone in Linux with dd

Monday, February 3rd, 2014

Simple way to clone drives in Linux. Assume drive sda is the source, and sdb is the destination. dd if=/dev/sda of=/dev/sdb & PID=$!; which kill -USR1 $PID; & runs dd in the background. PID=$! gets the last process id (of the dd command) Which runs the command every second or two. Kill -USR1 tells dd […]

Crystalfontz LCD – 635 on FreeBSD and OpenSolaris

Wednesday, December 16th, 2009

I have recently gotten a hold of a CFA 635 LCD + Keypad device. Very slick. I was doing some work with it and wanted to use a unix OS to drive the device for some custom work. I ran into a couple minor things when getting the device setup. 1) It works great in […]

When free isn’t free – enforcement of the GPL just because

Tuesday, December 15th, 2009

All I can say is wow. I read this article today and I am unfortunately not surprised. This is a perfect example of why many developers shy away from the GPL license when distributing their open source code. First, I want to say I am a big fan of Open Source. I have used […]

Recovering from a compressed ZFS root pool

Thursday, September 24th, 2009

Opensolaris and ZFS are great, but not without their limitations. A more recent addition is that Solaris can boot from a zpool, but not if you compress it or raidz it. Only single drives or mirrors, and no compression. A good practice is to setup your root pool for the system, then setup a separate […]

xVM (xen) poor VMDK file performance with ZFS and SATA drives

Thursday, September 24th, 2009

We recently setup an xVM server on a new blade running 24Gig ram and 3 500 gig SATA hard drives. We installed Linux as a Paravirtualized client and we were off. ** A quick note, this post is geared towards those who have poor IO performance running xVM, ZFS, and SATA drives. We have an […]

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