Often SAN/iSCSI storage is zoned between multiple Linux systems to be used for migrating data, high-availability, etc.
What I commonly see, however, is the tendency to try to mount this storage on all systems, at the same time — this is a no-no. In fact, it’s not enough to just not [...]
Author Archives: theunixguy
Zoning SAN/iSCSI storage to multiple Linux systems
May 31, 2011 – 9:40 am
Amazon EC2 now offers Micro Instances
September 9, 2010 – 9:02 am
I am pleased to find that Amazon’s EC2 service now offers a “Micro” sized instance. According to Amazon:
“Micro instances provide 613 MB of memory and support 32-bit and 64-bit platforms on both Linux and Windows. Micro instance pricing for On-Demand instances starts at $0.02 per hour for Linux and $0.03 per hour for Windows.”
This puts [...]
Modem Emulation.. Fast and easy!
January 15, 2010 – 5:30 pm
I have a weekness for anything that communicates via RS-232 Serial. This is probably due to most of my youth days being in front of a computer connected via modem to the world.
Occasionally I like to access Telnet BBS to re-live my youth. Telnet works fine, but once you want to start doing file transfers, [...]
BFTP: Back in the day….
December 21, 2009 – 6:49 am
Here is a little blast from the past for me.
Looking through my ~/bin directory, which is a collection of some of the scripts I’ve written going back to the wee days of me playing with UNIX.
I found this script, named “findjosh”.
#!/bin/sh
joshsip=`lynx -dump http://www.cae.wisc.edu/~resch/ip.txt | head -3 | tail -1`
case $? in
0) echo “Josh’s IP Address [...]
Simple Load Balancing with PV-Links [HPUX]
December 18, 2009 – 5:15 am
Many sites still only utilize HP’s PV-Links/Alternate-Links product to provide a simple failover for SAN connected disks. This product doesn’t do load balancing to spread out load, and is simply a failover if one of your SAN paths goes away.
This works great for redundancy, but with a little planning, you can accomplish simple [...]
Cloning a Volume Group [hpux]
December 17, 2009 – 8:30 pm
Often I am asked to clone an entire Volume Group including all of the logical volumes contained. This can be a tedius task when the Volume Group contains a hundred or so logical volumes.
This request is often used for testing software releases, deployments, etc.
I’ve use this script at least a dozen times per month, and [...]
Fixing missing devices (NO_HW) on HPUX
September 15, 2009 – 5:53 am
This last weekend, after some SAN changes, some of our HPUX systems experienced problems where either one of the hardware path’s to disk devices changed or the only path on some tape devices changed. Of course, this wasn’t found out about until Monday morning…
A reboot would have fixed this — but I don’t like rebooting [...]
Been a little crazy lately…
September 10, 2009 – 9:40 am
About 9 months ago I started a new project… Er, maybe even could call it a hack… A good hack. Tuesday, it was born.
I’d like to introduce the newest UNIX guy into my family… Meet my new Son, Dexter…
http://www.flickr.com/photos/47643618@N00/sets/72157622188318531/
Born 9:28am on 9/8/9. 8 pounds, 14 ounces. 20 1/2 Inches.
A very sad day…
August 8, 2009 – 7:47 am
Today marks a very sad day. Last night, we experienced several extended power outages. I’m saddened to say that “Nattie”, my HP DL380 RedHat ES4 Server, finally lost power.
No, she is O.K. now, and is back up and running. I am saddened because this server had been up for 826 days and had been a [...]