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  • The PK blog : Μάρτιος 2011 - Δημοσιεύσεις
    Νοέμβριος 2013 1 Ιανουάριος 2013 2 Νοέμβριος 2012 1 Οκτώβριος 2012 2 Ιούνιος 2012 2 Απρίλιος 2012 3 Δεκέμβριος 2011 2 Σεπτέμβριος 2011 2 Ιούνιος 2011 2 Απρίλιος 2011 1 Μάρτιος 2011 1 Φεβρουάριος 2011 1 Ιανουάριος 2011 3 Οκτώβριος 2010 2 Ιούλιος 2010 1 Ιούνιος 2010 1 Μάιος 2010 3 Απρίλιος 2010 1 Φεβρουάριος 2010 1 Ιανουάριος 2010 5 Δεκέμβριος 2009 2 Νοέμβριος 2009 9 Ιούνιος 2009 2 Μάιος 2009 1 Ιανουάριος 2009 2 Φεβρουάριος 2008 1 Ιανουάριος 2007 1 Δεκέμβριος 2006 1 Νοέμβριος 2006 1 Οκτώβριος 2006 1 Αύγουστος 2006 2 Ιανουάριος 2006 1 Μάρτιος 2011 Δημοσιεύσεις New Windows Azure CDN features and SDK 1 4 Δημοσιεύτηκε στις Πέμπτη 10 Μαρτίου 2011 11 05 πμ από Panagiotis Kefalidis Windows Azure SDK 1 4 was released yesterday with no breaking changes and a lot of stability fixes You can get the bits from here Among an important fix specially if you use a source control system where the web config was being locked but Windows Azure Tools still needed write access to update the machine key there are new features for the CDN quoting from the release announcement Windows Azure CDN for Hosted Services Developers can use the Windows

    Original URL path: http://www.dotnetzone.gr/cs/blogs/pkefal/archive/2011/03.aspx (2015-07-15)
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  • The PK blog : Φεβρουάριος 2011 - Δημοσιεύσεις
    2013 2 Νοέμβριος 2012 1 Οκτώβριος 2012 2 Ιούνιος 2012 2 Απρίλιος 2012 3 Δεκέμβριος 2011 2 Σεπτέμβριος 2011 2 Ιούνιος 2011 2 Απρίλιος 2011 1 Μάρτιος 2011 1 Φεβρουάριος 2011 1 Ιανουάριος 2011 3 Οκτώβριος 2010 2 Ιούλιος 2010 1 Ιούνιος 2010 1 Μάιος 2010 3 Απρίλιος 2010 1 Φεβρουάριος 2010 1 Ιανουάριος 2010 5 Δεκέμβριος 2009 2 Νοέμβριος 2009 9 Ιούνιος 2009 2 Μάιος 2009 1 Ιανουάριος 2009

    Original URL path: http://www.dotnetzone.gr/cs/blogs/pkefal/archive/2011/02.aspx (2015-07-15)
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  • The PK blog : Ιανουάριος 2011 - Δημοσιεύσεις
    it The answer came from Steve Marx pretty quickly and I m just quoting his email The bottom line is that a client should never receive corrupt data due to changing content This is true both from blob storage directly and from the CDN The way this works is Changes to block blobs put blob put block list are atomic in that there s never a blob that has only partial new content Reading a blob all at once is atomic in that we don t respond with data that s a mix of new and old content When reading a blob with range requests each request is atomic but you could always end up with corrupt data if you request different ranges at different times and stitch them together Using ETags or If Unmodified Since should protect you from this Requests after the content changed would fail with condition not met and you d know to start over Only the last point is particularly relevant for the CDN and it reads from blob storage and sends to clients in ways that obey the same HTTP semantics so ETags and If Unmodified Since work For a client to end up with corrupt data it would have to be behaving badly i e requesting data in chunks but not using HTTP headers to guarantee it s still reading the same blob I think this would be a rare situation Browsers media players etc should all do this properly Of course updates to a blob don t mean the content is immediately changed in the CDN so it s certainly possible to get old data due to caching It should just never be corrupt data due to mixing old and new content So as you see from Steve s reply there is

    Original URL path: http://www.dotnetzone.gr/cs/blogs/pkefal/archive/2011/01.aspx (2015-07-15)
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  • The PK blog : Οκτώβριος 2010 - Δημοσιεύσεις
    all at some limit of course Then there is the BizSpark program which gives you also a very generous package of Windows Azure Platform benefits to start developing on and of course let s not forget the MSDN Subscription Windows Azure offer which is even more buffed up than the others Ok I promised the Amazon part so here it is AWS billing model is different from Windows Azure It s very detailed a lot of things are broken into smaller pieces each one of them being billed in a different way Some facts Load balancing in EC2 instances it s not free Not only you pay compute hours but you re also charged for traffic GB that went through your balancer Windows Azure load balancing is just there and it just works and of course you don t pay compute hours and traffic just for that On EBS you re charged for every read and write you do I O charged for the amount of space you use snapshot size counts not in the total but on its own and you re also charged per snapshot operation Get or Put On Windows Azure Storage you have 2 things Transactions and amount of space you consume Also on snapshots only your DELTA differences is counted against your total not the whole snapshot SimpleDB is charged per machine hour consumed and GBs of storage Windows Azure Tables you only pay your storage and transactions You might say that I have to compare this to S3 but I don t agree S3 is not close to Windows Azure Tables as SimpleDB is What is even more disturbing on S3 is the fact that there is a durability guarantee of 99 99 which actually means you can lose data of 0 01 There is no RDS instance based on MySQL included in the free tier With introductory special you get a SQL Azure Web database 1GB for 3 months or for as long as you have a valid subscription when you re using the MSDN Windows Azure Offer where you actually get 3 databases For me the biggest difference is the development experience Windows Azure offers a precise local emulation of the cloud environment on your development machine called DevFabric which ships with Windows Azure Tools for VS2008 VS2010 All you have to do is click F5 on your Cloud project and you get the local emulation on your machine to test debug and prepare for the deployment Amazon doesn t offer this kind of development environment There is integration with Eclipse and other IDEs but every time you hit the Debug button you re actually hitting real web services with your credentials consuming from your free tier and as soon as you re done consuming that you start paying to develop and debug Free tier is more like a development tier for me Windows Azure offers you both the development experience you expect without any cost on your local machine with DevFabric

    Original URL path: http://www.dotnetzone.gr/cs/blogs/pkefal/archive/2010/10.aspx (2015-07-15)
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  • The PK blog : Ιούλιος 2010 - Δημοσιεύσεις
    Ιούνιος 2011 2 Απρίλιος 2011 1 Μάρτιος 2011 1 Φεβρουάριος 2011 1 Ιανουάριος 2011 3 Οκτώβριος 2010 2 Ιούλιος 2010 1 Ιούνιος 2010 1 Μάιος 2010 3 Απρίλιος 2010 1 Φεβρουάριος 2010 1 Ιανουάριος 2010 5 Δεκέμβριος 2009 2 Νοέμβριος 2009 9 Ιούνιος 2009 2 Μάιος 2009 1 Ιανουάριος 2009 2 Φεβρουάριος 2008 1 Ιανουάριος 2007 1 Δεκέμβριος 2006 1 Νοέμβριος 2006 1 Οκτώβριος 2006 1 Αύγουστος 2006 2 Ιανουάριος 2006 1 Ιούλιος 2010 Δημοσιεύσεις Windows Azure ndash Custom persistence service for WF 4 saving information on Windows Azure Blob Δημοσιεύτηκε στις Πέμπτη 1 Ιουλίου 2010 12 22 πμ από Panagiotis Kefalidis Recently I ve been looking a way to persist the status of an idling Workflow on WF4 There is a way to use SQL Azure to achieve this after modifying the scripts because they contain unsupported T SQL commands but it s totally an overkill to use it just to persist WF information if you re not using the RDBMS for another reason I decided to modify the FilePersistence cs of the Custom Persistence Service sample in WF 4 Samples Library and make it work with Windows Azure Blob storage I ve created two new methods to Serialize

    Original URL path: http://www.dotnetzone.gr/cs/blogs/pkefal/archive/2010/07.aspx (2015-07-15)
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  • The PK blog : Ιούνιος 2010 - Δημοσιεύσεις
    Ιανουάριος 2009 2 Φεβρουάριος 2008 1 Ιανουάριος 2007 1 Δεκέμβριος 2006 1 Νοέμβριος 2006 1 Οκτώβριος 2006 1 Αύγουστος 2006 2 Ιανουάριος 2006 1 Ιούνιος 2010 Δημοσιεύσεις My great experience with Windows Azure customer support Δημοσιεύτηκε στις Παρασκευή 18 Ιουνίου 2010 10 49 μμ από Panagiotis Kefalidis Once again Microsoft proved that it values its customers either big enterprise or small startups We re a small private held business and I personally have a major role in it as I m one of the founders Recently I ve been giving some pretty nice presentations and a bunch of sessions for Microsoft Hellas about Windows Azure and Cloud computing in general I was using my CTP account s I have since PDC 08 and I had a lot of services running there from times to times all for demo purposes But with the 2nd commercial launch wave Greece was included and I had to upgrade my subscription and start paying for it I was ok with that because MSDN Premium subscription has 750 hours included month SQL Azure databases and other stuff included for free I went through the upgrade process from CTP to Paid everything went smoothly and there I was waiting for my CTP account to switch on read only mode and eventually fade away So during that process I did a small mistake I miscalculated my instances running I actually missed some That turned out to be a mistake that will cost me some serious money for show case marketing demoing projects running on Windows Azure About two weeks ago I had an epiphany during the day and I was like Oh crap Did I turned that project off How many instance do I have running I logged on the billing portal and sadly for me I was

    Original URL path: http://www.dotnetzone.gr/cs/blogs/pkefal/archive/2010/06.aspx (2015-07-15)
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  • The PK blog : Μάιος 2010 - Δημοσιεύσεις
    wouldn t happen You ll only lose data from the instance that died As Eugenio Pace says You have to be prepared to fail and he s right Every single moment your instance can die without a single notice and you have to be prepared to deal with it Oh boy So really there is no single solution or best practice For me it s best guidance Depending on your scenario one of the solutions above or even a new one can fit better for you than for others Every project is unique and has to be treated as such Try to think out of the box and remember that this is deep water for everyone It is just some of us swim better PK 0 σχόλια Δημοσίευση στην κατηγορία Cloud Azure Architecture Cloud computing ndash Most common concerns and my thoughts Δημοσιεύτηκε στις Δευτέρα 17 Μαΐου 2010 1 26 πμ από Panagiotis Kefalidis Every single time something new emerges in the IT market there are three distinct categories of people Early adopters Late majority Skeptics Each one of them has its own reasons and its own concerns about when why and if they are going to adapt to this new technology either completely or in a hybrid mode All of them have some things in common They share the same concerns about security billing taxes availability latency and probably some others Concerns and my thoughts Billing is something that can easily be solved and explained by clever and good marketing Unfortunately there is no such thing as local billing Cloud computing services are truly global and the same billing model the same prices the same billing methods have to be used to provide a fair and consistent service to every customer This has to change For some markets a service can be really cheap but for some others can be really expensive Increasing the price in some countries and decreasing in some others can make the service more fair and more adoptable Using a credit card to identify the country is a good method but there is a problem It s called taxes Taxes is a way for a government to make money In many countries Greece being one of them having a credit card with a decent limit it s a privilege Unfortunately I mean it in a bad way Interest is quite high and with such an unstable tax policy you can never be sure if there won t be any extra fees you might have to pay sooner or later But I guess this is not only our problem but for some other countries too mostly emerging markets Providing another way of paying monthly fees for service usage can easily overcome this Security Oh yes security Countless questions during presentations and chats are about security Tons of what if Yes it s a big issue But too much skepticism is never good I believe people are not worried about security issues like data leakage stolen etc

    Original URL path: http://www.dotnetzone.gr/cs/blogs/pkefal/archive/2010/05.aspx (2015-07-15)
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  • The PK blog : Απρίλιος 2010 - Δημοσιεύσεις
    ολοκληρώθηκε Πλοήγηση Αρχική σελίδα Εκδηλώσεις Ιστολόγια Συζητήσεις Εκθέσεις Φωτογραφιών Αρχειοθήκες Ιστορικό Δημοσιεύσεων Ιούνιος 2015 2 Απρίλιος 2015 1 Μάρτιος 2015 2 Νοέμβριος 2014 1 Νοέμβριος 2013 1 Ιανουάριος 2013 2 Νοέμβριος 2012 1 Οκτώβριος 2012 2 Ιούνιος 2012 2 Απρίλιος 2012 3 Δεκέμβριος 2011 2 Σεπτέμβριος 2011 2 Ιούνιος 2011 2 Απρίλιος 2011 1 Μάρτιος 2011 1 Φεβρουάριος 2011 1 Ιανουάριος 2011 3 Οκτώβριος 2010 2 Ιούλιος 2010 1 Ιούνιος 2010 1 Μάιος 2010 3 Απρίλιος 2010 1 Φεβρουάριος 2010 1 Ιανουάριος 2010 5 Δεκέμβριος 2009 2 Νοέμβριος 2009 9 Ιούνιος 2009 2 Μάιος 2009 1 Ιανουάριος 2009 2 Φεβρουάριος 2008 1 Ιανουάριος 2007 1 Δεκέμβριος 2006 1 Νοέμβριος 2006 1 Οκτώβριος 2006 1 Αύγουστος 2006 2 Ιανουάριος 2006 1 Απρίλιος 2010 Δημοσιεύσεις Yes I rsquo m still here Δημοσιεύτηκε στις Τετάρτη 21 Απριλίου 2010 12 27 μμ από Panagiotis Kefalidis Well I m still here I know it s been like ages since my last post but believe me I ve been quite busy with tons of stuff and there was no time to blog So let s catch up a little bit 1 I ve been awarded the MVP title for 2010 on Visual C Thank you very

    Original URL path: http://www.dotnetzone.gr/cs/blogs/pkefal/archive/2010/04.aspx (2015-07-15)
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