Thursday, March 28, 2013

Platespin Migrate on RHEL

note to self

We had a requirement to convert a number of workloads on RHEV (Red Hat Enterprise Virtualization) environment to vSphere. This is so far unsupported with the vSphere converter tool, and it fails to at the initial step of querying the source system when attempted, complaining about not being able to detect volumes on the source system. (On RHEV, scsi disks are detected as /dev/vdX devices, could be one of the reasons.)

After trying at it for a while, we decided to give PlateSpin Migrate a go, and the results were quite satisfying.

Setting up and starting a workload "copy" is quite straightforward, but could get tricky at times if the source system is running GNU/Linux. (RHEL etc.) PlateSpin supports file based and block based copy methods and for Linux workloads, only the block based method is supported if the migration is to happen while the source is online. Block based copy method depends on a custom kernel module -which has to be build manually, if PlateSpin doesn't come with a matching one for the current kernel.

Process is explained in detail on the below link.
http://www.novell.com/support/kb/doc.php?id=7005873

During the conversion, if it throws an error similar to "Could not load driver: Exec format error", then probably the kernel module is not built compatible to the currently running kernel.

To make sure a built module is supported on the current kernel, without going through the trouble of packaging it for PlateSpin, it can be inserted to the running kernel manually. Inserting should not return any error. Loaded module can be viewed and then removed to clean up, by below commands in the order given.

insmod blkwatch.ko
lsmod | grep blkwatch
rmmod

Even though it looks like a bit more complicated than the vSphere converter, In my opinion, PlateSpin does a far better job! It will be interesting to see how it will handle a conversion where the kernel it self has to be replaced with a different one to be able to run on the destination platform. (eg. Xen to vSphere )

vCenter Converter Standalone P2V Fail

note to self


vCenter standalone converter 5.0.1-875114 (latest as of 03-2013) still seems to be having this issue with P2V on systems with using the VLAN tagging at the OS level. Culprit seems to be the "dot" (.) in the interface name.

This has been witnessed, identified and workaround suggested by a number of people and the article that helped me is here. Simply turning off those interfaces before the conversion, you can proceed to convert the system -if that is a possibility. If not, you can try the alternative suggested on the same link above, by changing how the interface is named ( VLAN_NAME_TYPE=VLAN_PLUS_VID_NO_PAD )

I witnessed the issue with few RHEL5.4 systems, but was unable to replicate the same on the RHEL5.8. Perhaps the issue has some dependancy on a OS component which has been updated on the later releases on RHEL. ( not so sure! )

Tuesday, March 26, 2013

Story of Stuff

note to self

An old video i like. Thought i'd keep it saved here in case i want to come back to this at some point.


Site : http://www.storyofstuff.org

Sunday, March 24, 2013

Earth Hour 2013



So "Earth Hour" is upon us. It is a great idea to get everyone rallied behind such a cause, and it has a big positive effect on the environment owing to it's massive scale. (Supporters from some 152 countries are said to be taking part of it this year)

If you haven't heard about it at all -which is highly unlikely, head on to http://www.earthhour.org and find out more about it. Basically, the idea is to get everyone to shut off the lights in their home/office/building/city? etc. for just 1 hour out of the whole year, alongside all the other supporters of the cause. Of course it is not just about shutting off lights, think of it as a starting point.

There is also a local community around this who's been around for quite some time now. I only came across their page on FB about a day or two ago, my ignorance is to be blamed in that. The group however, seem to be doing good job in getting local organizations involved and popularizing the cause.

Maybe its just me, but wouldn't it be so awesome if all of us -or most- didn't make it this thing where you show up in specially made tees and a candle! It looks nice no doubt, but the cause should be little bit more important and the followers a bit more sensible. After all, the idea is to preserve the environment. 

Surely you don't believe that all of this you do in the name of "Earth Hour" is going to have a good effect on the environment that surrounds you. Why do it then, specially in the name of an event that aims to unite everyone around preserving the earth, the nature at least for just 60 minutes a year. 

Doesn't make much sense, does it. Then again, if all the campaigning is done in such a manner that it has zero  negative effect on the environment, it will lose the "cool" image(will it?) and none us will show up at any of the public events? Something to think about, isn't it? (Or not)

For my part, i will shut off the electricity, blow off any candles and spend the one hour in darkness....Hoping it is a start. Hoping i would be able to do a little bit more tomorrow. Hoping it would make a difference..a Real difference.

Sunday, March 03, 2013

Colombo MapUp 2013




So we participated in the Colombo MapUp 2013 which took place today. Was looking forward to it since few days and it turned out to be quite interesting. 

Learned some new things, got to meet our expert reviewer team and chat, met a lot of local mappers, overall a great event experience. Also started using my G+ app on the phone finally and this "Party Mode" which i never cared for turned out to be a big convenience! I will be using it more often from now on.

Probably i will write a bit more on the event later. For now, to anyone who wish to get involved i'd highly recommend this page. Some of the photos of the event today should be visible on the G+ page.

Update: Post your questions to this group here http://goo.gl/UTD29 and pass on the link.

Friday, March 01, 2013

Cleaning up and other things

Thought i'd clean up the layout a little bit now that I'm in here after a long long time. Not that anyone would notice (haha) just something i wanted to do for a while now.

Decided to remove most of the Widgets i put up time to time. Didn't really want to remove FSF and Fedora widgets but in the end decided against them as i want to have a leaner look. Maybe i'll add them back again in their tiny form.

So i was watching a few things on the tube and off and came across something pretty interesting. ShayCarl was on one of the videos and i could barely recognize him. I had to actually go back and check to confirm that it IS in fact the right guy. The reason is massive weight loss program he has come up with and documented on one of his channels ShayLoss. Thanks to my ignorance, busyness and ignorance, i have actually missed the whole thing which is about 3 years old news. Anyway, i find the whole thing quite interesting and inspiring. And now i'm watching my way through the channel starting from the beginning.

Down below is what i was watching when i came across the whole story above, from another YouTuber i follow devinsupertramp. Enjoy.