Interview with Jon “Maddog” Hall

Posted by on Apr 1, 2014 in Linux, NetEye, Open Source System Management Conference | 0 comments

“….we just called it “software” – Jon (maddog) Hall

Jon ‘”Maddog” Hall will hold the keynote at the Open Source System Management Conference on the 10th of April. We asked him about his opinion on the real advantages of Open Source apart from licensing  and why he sees himself as “different” from any other Open Source people.

Some call you an IT or Open Source legend. Is Open Source in your opinion still combined with an “attitude”, is there an ethical context?

Whenever you have a large group of people involved with any project you are bound to have different styles of presenting a message or messages. Some of these presentations might be perceived of as “attitude”. The first goal of Linux was not necessarily to create a gratis operating system, but one of high quality. An operating system that was not hampered by release cycles determined by new pieces of hardware that had to be delivered, or new products that had to be supported. Software that could be delivered “in its own time”. Examples of this was the push-back by Linus on log-based file systems, and not putting them in until they were ready.

Another goal was to recognize meritocracy…the rising to the top of the best programmers and having them lead the project.

Another goal was to allow collaboration, instead of each participant “re-inventing the wheel”. And of course the goals of the Free Software community is for the end-user to have access to the tools and sources to be able to modify their code far into the future. This is what is promised by the GPL as a license.

Where do you see Open Source heading in the next five to 10 years? What is the difference in the scene when your started in relation to what we see today?

First of all, you need to understand that I have been coding since 1969.  When I started coding there were few programs delivered in binary form. There was no copyright of software nor software patents. People wrote code under contract law, and typically if you paid for the code to be written, you owned the code. There were also user groups, bulletin boards, and such that freely shared source code. We did not call this “Open Source” or “Free Software”….we just called it “software”. But CP/M, Apple and Microsoft changed all of that for most people.

Not for me, since I always worked for companies large enough to demand source code from their vendors, schools that got source code for research (or wrote their own), companies that wrote their own code or software vendors.  So I did not really use “closed source” code, although I had customers that did. When working for Digital Equipment Corporation I often had to get them access to source code from our binary products. Then I met Linus in May of 1994 and saw that Linux (and GNU/Linux) was going to be of great value to commercial enterprises.

Does proprietary software really turn you into a “maddog”?

I am different than a lot of other “Open Source” people. I do not spit on people that use proprietary software, nor do I spit on people that write it (unless of course they break the law or use unfair business practices).  However I tell people why using Free Software is good for them, their educational facilities and their government, and lament when they do not make the change.I find it interesting that despite “Vista”, the de-commissioning of Windows XP, the issues with privacy and security (ala NSA) with proprietary software, that people are not flocking to FOSS by the droves, but we are slowly winning.

Apart from licensing: What are the 3 main advantages of Open Source ?

Control of your software, which allows control of your business.  Otherwise you are a software slave, beholding to the “master” software company that controls your lifeblood. The transfer of license royalties that typically travel outside your country to funding local programmers to make changes to the software, which creates local jobs that then funnel local money back into the local economy. Security, privacy, longevity – but these go back to “control”.

What about the Italian IT and Open Source scene. Anyone you know? Anything that comes to mind for you?

Not really.  And that is probably a problem. but now that Francis is the Pope, I have some hope.

What about your session at our conference. What well to focus on?

My keynote will be focusing on how Free and Open Source Software has been fundamental in the computer science community in general and in System Management software in particular.

Dear Jon, thank you very much for this interview?

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Remake SW RAID1 from a new HDD and an old HDD with bad blocks

Posted by on Nov 18, 2013 in Linux, NetEye | 0 comments

Question:

If you have a SW RAID1 and I just replaced, say, /dev/sda with a new HDD as the old one failed. Now, upon trying to recreate the RAID array you discover that the “good” HDD (/dev/sdb) has bad blocks which prevents mdadm from resyncing the array. While you could make backups, replace /dev/sdb as well and re-install the server completely, one is wondering if there is any way one could “trick” mdadm into resyncing the RAID array and then replace /dev/sdb with a new HDD. The badblocks should be located in an unused area of /dev/sdb which is only used when trying to recreate the RAID array, otherwise this data is lost to you.

Answer:

You should verify whether the affected blocks and underlying bad sectors on the disk are reallocated to “spare sectors” area? The bad sector should be reallocated when write operation fails. Verify it with smartctl:

smartctl -a /dev/sdb | grep -i reallocated

The last column should contain a number of total reallocated sectors. If there is zero try to read the bad sector:

hdparm –-read-sector XXXXXXXX /dev/sdb

It should return an I/O error otherwise I would recommend to skip next section.

The error means the sector was not reallocated yet. So you can try to reallocate it forcibly by writing it.

IMPORTANT: Remember that any data stored in this sector will be lost after this step !!!:

hdparm –-write-sector XXXXXXXX --yes-i-know-what-i-am-doing /dev/sdb

By the way, the sector number XXXXXXXX should be possible to obtain from kernel messages (dmesg command or from /var/log/messages). As you had bad blocks during resynchronization there should be some related messages similar to:

... end_request: I/O error, dev sdb, sector 1261071601

Then, try to verify it with smartctl again. Does the counter increased? If so try to read it with hdparm. Now, it should read it without any error as it is supposed to be reallocated. Done.

Finally, you can continue with mdadm and with adding the disk to your degraded mirror.

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