I’m a speaker at PASS SUMMIT 2017

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Hello Friends,

I’m glad to announce that I’m a speaker at PASS Summit 2017, the largest SQL Server event on the planet (maybe in the universe 🙂 ).
In my session I will talk about high availability, using Azure as DR site.
I have been participating in the PASS Summit since 2012, and this will be the first time that I will participate as a speaker :).
It will be a short session “Lightning Talks” but I’ll try hard to deliver a good content.
For those who don’t know, the summit PASS is an annually event in the USA (usually in Seattle). You can register your self at PASS werbsite.
For those who going to Seattle, I’ll see you there. for those who will not be able to go this year, you can have part of the event at PASS website, they will transmit some information and interviews at PASStv during the event.

Regards,
Marecelo Fernandes

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Olá Amigos,
Estou feliz em anunciar que serei um palestrante no PASS Summit 2017, o maior evento de SQL Server do planeta (talvez do universo :))
Em minha sessão vou falar sobre alta disponibilidade, usando Azure como site de DR.
Tenho participado do PASS Summit desde 2012, e pela primeira vez participarei como palestrante :).
Será uma paletra curta “lightning talk” mas estou me esforçando para entregar um bom conteúdo.
Para quem não conhece, o PASS summit é realizado anualmente nos EUA (geralmente em Seattle).
Para quem vai para o Seattle, te vejo por lá. para quem não conseguirá ir este ano, no site do pass (PASStv) será transmitido algumas informações e entrevistas ao vivo durante o evento.
Obrigado,
Marcelo Fernandes

Anúncios

Escalando a montanha 4º ano

O frio na barriga esperando e-mail de confirmação ainda é o mesmo do primeiro ano em 2014.

Demorei para escrever este post pois estava aguardando o welcome kit….

email

Agradeço a todos da comunidade tecnica a quem dedico esta renovação do título…

Conforme venho dizendo, estou escalando a minha montanha:), tenho grandes amigos que são MVPs há 10 anos e espero chegar la um dia:), estou no meu 4º ano e espero atingir tantos quantos os meus amigos.

Atualizando a foto.. ja se foram 4 anos  … rumo aos 10 anos:)

OBS: Na barrinha de progressão do Windows estou em 40%:)

IMG_8406

Obrigado a todos e especial ao programa  MVP e a comunidade tecnica no geral.

SQL Saturday #609 – Caxias do Sul

Hallo leuter

Estou embarcando para o Brazil para participar da edição #609 do SQL Saturday.

Ainda da tempo de se registrar no evento: http://www.sqlsaturday.com/609/EventHome.aspx

Minha sessão será as 14:00, abaixo a  grade completa de palestras

Saturday, Jun 24, 2017 Conference Schedule

08:00 AM – 09:00 AM Registro e Café de Boas-Vindas
09:00 AM – 09:30 AM Keynote
09:30 AM – 10:45 AM
10:45 AM – 12:00 PM
12:00 PM – 01:00 PM Almoço
01:00 PM – 02:00 PM
02:00 PM – 03:00 PM
03:00 PM – 03:30 PM Lanche
03:30 PM – 04:30 PM
04:30 PM – 05:30 PM
05:30 PM – 06:00 PM Encerramento e Sorteio de Brindes

 

Te vejo lá

Abraços,

Marcelo Fernandes

Azure Meetup Berlin

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Hello friends,

I’m very happy to share that I’m going to speak at Azure Meetup Berlin on May 23,  so if you are here in Berlin, this is a great opportunity to learn and share knowledge about Azure.

We will have two lectures:

Talk 1: MovingImage moving to Microsoft Azure (45 min)

Talk 2: High availability for SQL Server using Azure as DR site (60 min)

You can register yourself : https://www.meetup.com/Berlin-Microsoft-Azure-Meetup/events/239699301/?gj=co2&rv=co2

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Olá Amigos

NO proximo dia 23 de Maio vou palestrar no Azure  Meetup Berlin, teremos 2 palestras

Talk 1: MovingImage moving to Microsoft Azure (45 min)

Talk 2: High availability for SQL Server using Azure as DR site (60 min)

O evento será na MovingImage

você pode se registrar através deste link : https://www.meetup.com/Berlin-Microsoft-Azure-Meetup/events/239699301/?gj=co2&rv=co2

Thanks folks

Thinking out of the box – SQL Server FCI using the File Share (SMB 3.0) as Storage option [Part 1]

Types of Storage for SQL Server

Before we begin with the “SMB 3” Let us first understand some types of storages that we can use in SQL Server and the difference between them.

There are several types of storage that can be used with SQL Server:

  • Internal disks – SSDs or traditional HDDs
  • Storage card PCI-E
  • Direct-attached storage (DAS)
  • Storage area networks (SAN)
  • Server Message Block (SMB) 3.0 file shares
    • Available in Windows Server 2012 and 2012 R2
    • SQL Server supports the use of the file shares from the 2012 version (stand-alone or FCI)

As you can see Microsoft allows us to use several types of storage for the installation of our SQL Server and storage our databases.

There are also some technologies that allow us to use Failover Clustering without the need for shared storage:

  • iSCSI Target Server
  • SMB FileShare (using SMB 3.0 or 3.02)
  • Cluster Shared Volume (CSV)

In this article we will focus on SMB which we can use in a SQL Server stand-alone or cluster (FCI)

 

Storage HDD vs SSD

I/O bottlenecks can occur in our environment so it’s imperative to understand what type of disk we use and the performance that is offered by these, so let’s compare the performance between the SSD disks and mechanical disks (HDD):

  • HDD – performance for sequential I/O acceptable
    • 100-200 MB/sec. per disc
  • HDD – low performance for random I/O
    • 100-200 IOPS per disk
  • SSD – good performance for sequential I/O
    • SAS/SATA 6Gbps can reach up to 550 MB/sec. per disc
    • SAS/SATA 3Gbps can reach up to 275MB/sec. per disc
    • PCI-E card can reach up to 6.5 GB/sec.
  • SSD – great for random I/O
    • SAS/SATA 6Gbps can reach up to 100.000 IOPS
    • PCI-E storage cards can reach up to 1.3 million IOPS

As you can see traditional HDDs do not have good performance in random I/O. SSD has outstanding performance for random I/O, and PCI-E is best for this type of activity.

Note that the slower disk is cheaper and the disk with better performance more expensive, so for some scenarios of I/O bottleneck the simple exchange of the spinning disks for a SSD or PCI-E cards isn’t always feasible due to cost.

Comparing I/O performance

To compare the performance of the technologies mentioned above we ran a simple I/O test on a shared storage in a data center which is a very common scenario in today’s environments. Unfortunately, not every company has a capital to dedicate a storage device for a particular service but that’s OK. I also ran the same test on a SSD disk and on a dedicated high-end storage array for SQL.

As we can see we have 3 types of solutions where the cheapest is the storage shared with SAS disks and more expensive (and I mean really expensive J) is the high-end storage which can run you millions of dollars.

Note: Testing conducted with the DiskSpd tool with the following configuration:

diskspd-b8K-d180-o16-t4-h-r-w25-L-Z1G-D:\iotest.dat c10G

smb1

Reading the above table, we see that the best solution is the high-end storage that costs too much but if you’re looking closely at the SSD disk you can see that performance similar to the high-end storage but the SSD disk costed me only $150 dollars which is not so far away in price for shared storages offered by most of datacenters.

Looking at only the total I/O column we have:

 

smb2

In this case the cost-benefit of the SSD disks is more advantageous to the shared disk.

Choosing the Storage based on Workload

The following are a list of tips that will help you choose the best hard drive for your SQL Server environment based on workloads:

  • SSD offers better performance for random I/O
    • It also offers better sequential performance compared to HDD
    • SSD is more expensive than the HDD (per GB)
    • The price of SSD is becoming more affordable
  • HDD offers a reasonable performance for sequential I/O
    • HDD have a bad performance for random I/O (Which can be “masked” through a controller’s cache)
    • Flash-based caching can provide better performance for the HDD
  • SSD is the best choice if “the cost” is not a problem
    • Recommended for environments with high overhead of random I/O
    • Recommended for environments that have I/O bottlenecks

 

3.0 SMB File Shares

We have seen in previous threads that SQL supports basically two types of disks: the HDD and SSD, but how about installing SQL Server into a shared folder on a File Server?

In the past a lot of people would be scared by this idea, because historically the statistics of the SMB (Server Message Block) aren’t very good, we can highlight some negative points that many infrastructure administrators cited about the SMB:

  • File shares are slow
  • The connection with a file share can fail
  • SMB consumes too much CPU

In the new SMB 3 these negatives points were treated or disposed of, below are some key points about SMB 3 that will be detailed throughout this chapter:

  • Supports I/O using multiple concurrent network cards
  • Fault tolerant of network interfaces
  • Integrated with Windows Failover Clustering
  • Windows Server 2012 supports “Direct SMB”, which allows the use of network cards supported by the “Remote Direct Memory Access (RDMA)”
    • RDMA requires SMB Multichannel
    • RDMA offers high speed with low latency and low CPU consumption

FCI SQL Server using the File Share (SMB 3.0) as a storage option

Windows Server 2012 was made available the new version of the Server Message Block SMB 3.0 and upgraded to 3.2 in Windows 2012 R2.
Only SQL Server 2012 or higher supports SMB as a storage solution SQL Server Standalone or FCIs.

smb3

Figure 1.1: Example of using File Server environment as a Storage option

 

In Figure 1.1 we illustrate a SQL Server clustered environment using a File Server (SMB) as storage solution for SQL.

You can see that we are using the SOFs (Scale-Out File Server) which is a new file storage solution and a SQL Server cluster with 3 nodes

This is a solution for enterprise-level storage because it is scalable, reliable and always available.

It provides easy provisioning and management because we can use the familiar tools of Microsoft SCCM, PowerShell to manage the environment.

It also uses the latest network technologies (Convergent, Ethernet RDMA) which provides us greater flexibility,

The solution also reduces capital and operational costs because we have a storage that can be used by other services.

An SMB solution offers us some features we don’t have in conventional solutions:

  • SMB Transparent Failover – continuous availability if one node fails
  • SMB-Scale-out – Automatically balanced Active / Active file server clusters
  • Direct SMB (SMB over RDMA) – Low latency, high throughput, low CPU usage
  • Multichannel SMB – Increased network throughput and fault tolerance
  • SMB Encryption – Secure data transmission, without the costly PKI infrastructure
  • VSS for SMB File Shares – Backup and Restore using an existing VSS framework
  • SMB PowerShell, VMM Support – Manageability and support through the System Center and PowerShell

SMB Transparent Failover

One of the components that doesn’t have much protection in a traditional cluster are disks, if there is a failure in the storage or in the middle of communication between the storage and the server (Fiber, HBA, etc.) the SQL Server service that is clustered will fail! SMB 3 has a great feature that allows us to perform the application failover using SMB (in the case of our example SOFs) with zero downtime for SQL Server, there is a small and fast I/O delay during a failover but that’s it.

The transparent fail over can be planned or unplanned which means we increase the level of availability of our application as a result. This does not mean that if by chance a SQL Server fail over occurs this process will be transparent to the application, SQL Server has downtime, what has no down time is the file server that we are using as an alternative storage. We eliminate the protection issue between the storage communication and the SQL Server.

smb4

Figure 1.2: simulation of Transparent Failover in SMB 3

In Figure 1.2 we have an illustration of the transparent fail over process, it shows a SQL Server cluster that has been installed in the file server directory (\\fileserver\SQLtest) and in this context we note that the service was active on the first node and was moved (failed over) to another node and during this the SQL Server service is not affected, it remains online. This type of protection is only available with the SMB 3.

Direct SMB (SMB over RDMA)

Before we begin with the SMB over the Direct Memory Access (RDMA) let us first understand what the RDMA.

RDMA is a protocol that allows access to the memory of a remote computer. That is, if you have a network card with RDMA support the SMB client has direct access to the memory of the SMB server making the file transfer extremely fast and with very low CPU consumption.

The benefits of RDMA are:

  • Low latency
  • High yield
  • Zero copy capability
  • OS/by-pass

The following technologies leverage RDMA Hardware

  • InfiniBand
  • iWARP RDMA over TCP/IP:
  • ROCE: RDMA over Ethernet convergence

smb5

Figure 1.3: illustration of the operation of the RDMA in SMB 3

 

SMB Scale out

With Scale-out File Server (SOFs) you can share the same folder on multiple nodes in a cluster. In the example in Figure 1.2 we have a two-node file server cluster using the scale-out SMB protocol, a computer running Windows Server 2012 R2 or Windows Server 2012 can access file server on either of two nodes. This is possible because of the new Windows Failover Cluster features along with the File Server SMB 3.0 protocol. With this in place you can now say that SOFs will always be online and in case of increased demand we can simply add new servers in the cluster and all this in a production environment with the operations totally transparent to the applications

The main benefits provided by SOFs Server include:

  • File Server Active-Active All cluster nodes may accept and serve the SMB client requests with transparent fail over between nodes.
  • Increased bandwidth The maximum bandwidth of a share corresponds to the sum of the width of all nodes of cluster file server. In previous versions of Windows Server, the total bandwidth was limited to the bandwidth of a single cluster node. You can increase the total bandwidth by adding new nodes.
  • CHKDSK with zero downtime There was a significant improvement made to CHKDSK in Windows Server 2012 that drastically reduces the amount of time that a system is off-line for repairs the CSVs (Clustered Shared Volumes) eliminating the offline phase.
  • Clustered Shared Volumes Cache CSVs in Windows Server 2012 introduce support for a read cache significantly improving performance.
  • Simpler management With SOFs you can add new CSVs and create multiple shares. You no longer need to create multiple Cluster File Servers each with separate cluster disks.
  • Automatic Rebalancing of SOFs’s clients In Windows Server 2012 R2, automatic rebalancing improves the scalability and manageability of SOFs. SMB client connections are controlled by shares rather than by server so clients are redirected to the node with better access to the volume of that share thereby significantly improving performance and reducing traffic between servers.

 

SMB Multichannel

SMB Multichannel is another great feature of SMB 3.0 since it provides us increased network throughput and fault tolerance.

Let’s imagine two scenarios where we have a 4-core environment and a 10 GB network card without Multichannel technology and another environment with Multichannel technology.

In the first scenario, let’s imagine that we have a session with several I/Os we would see a high use of only one core while we have 3 without use. This is because in the old version of SMB we did not have Multichannel support and SMB only creates 1 TCP connection.

If I run the same test in the second scenario with SMB 3 supporting Multichannel we will see the distribution of the use of cores, this happens because SMB 3 detects that the network card has the Receive Side Scaling (RSS) feature and creates multiple connections TCP allocating the load between the CPUs.

You do not need to make changes or settings in your environment to use Multichannel, SMB 3 detects RSS and automatically creates multiple connections.

Figure 1.4 illustrates this behavior of SMB Multichannel.

 

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Figure 1.4: comparative environmental behavior with and without Multichannel
(image kindly provided by Jose Barreto [http://blogs.technet.com/b/josebda/])

 

Let’s imagine 2 other scenarios, 1 without SMB 3 with two file servers the first with two network cards with RSS support and another with two network cards without RSS. The other scenario is exactly the same as the first one but with SMB 3 Multichannel support, image 1.5 illustrates this.

In the scenario without SMB 3 Multichannel support, although we have two network cards in both file server clusters, we do not have the automatic fail over that is present only in SMB 3, let’s imagine that we have a session with several I/Os in this if we use only 1 network card (both in the cluster with RSS support and the other without RSS support) and we would have the single-core high-power scenario due to the creation of only 1 TCP connection.

In the scenario with SMB 3 Multichannel support, we have automatic fail over and we can use all available bandwidth on the server as Multichannel will use the two network cards to increase bandwidth. In the cluster with the network cards without RSS support, but with the SBM 3, Multichannel will use the 2 network cards by opening only one connection in each of them.

 

Figure 1.5 illustrates this behavior of SMB Multichannel with multiple network adapters.

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Figure 1.5: Comparing behavior of environments with and without Multichannel using multiple NICs (image kindly provided by Jose Barreto [http://blogs.technet.com/b/josebda/])

 

The key points of the Multichannel SMB are:

Full Throughput

  • Bandwidth aggregation with multiple NICs
  • Uses multiple cores of the Cpu when using Receive Side Scaling (RSS)

Automatic failover

  • SMB Multichannel implements fault detection, end-to-end
  • Enjoy teaming NICs if present (but not require)

Automatic configuration

  • SMB detects and uses multiple network paths

SMB performance Multichannel

Jose Barreto who is Principal Program Manager at Microsoft and helped in the development of SMB 3 did a great performance testing with the SMB3 with the following settings:

  • Windows Server 2012 using 4 10GbE NICs
  • Linear scaling of bandwidth:
    • NIC 1-1150 MB/sec
    • 2 NICs-2330 MB/sec
    • 3 NICs-3320 MB/sec
    • 4 NICs-4300 MB/sec.
  • Network cards with support for RSS (Receive Side Scaling)
  • Bandwidth for small I/O cause bottlenecks in CPU

The result obtained with the tests were spectacular, note the performance with the Multichannel

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Figure 1.6: SMB Performance Multichannel (image kindly provided by Jose Barreto [http://blogs.technet.com/b/josebda/])

 

We note that for small I/Os we do not get much advantage by increasing the amount of network card, the higher I/O the gain is significant as we increase the number of network cards, reaching about 4500 Mb/s with 4 network cards for I/O size greater than 16384

Remember the test table comparing some types of storage that we discussed at the beginning of the this article?

smb9

Obviously the test I did with Diskspd was different from the test  that José Barreto ran, but it serves as a parameter to break some paradigms, note the MB/s column of storage vs. SMB 3.

I’m not telling you to leave the SAN and go to SMB 3.0 tomorrow as this would have a certain financial and bureaucratic impact, but it’s worth a test in your environment, isn’t it? And how about considering SMB3 for new projects?

SMB 3 is another alternative that we have of storage with the differential of performance, availability and scalability. So “think out of the box!

As shown, we have greater disk protection with Transparent Failover and we use the full bandwidth available on the servers.

PS: It’s very important to pay attention that the environment used here had an specif network card, the normal nics will works, but if you have a very transactional environment you should have a nic with RDMA and RSS support.

 

Regards,

Marcelo Fernandes

 

Como foi meu processo de mudança para Berlin?

Amigos,

Durante estes dois meses que estou aqui em Berlin, recebi algumas mensagens questionando como foi o processo para vir para Berlin e como é trabalhar aqui na Europa.

Bom vamos lá, primeiro gostaria de dizer que o que vou compartilhar aqui é referente a minha experiência e ocorreu no final de 2016. (isto porque os processo mudam com frequencia)

1- Como é trabalhar na Europa?

Cara, é bem legal… e ao mesmo tempo muito … muito diferente do Brasil, a começar pela cultura, no Brasil estamos acostumados a interagir mais com as pessoas e colegas de trabalha (no horário de trabalho), aqui não é bem assim…
você não verá seus colegas de trabalho parando as atividades diversas vezes ao dia para tomar um café ou simplesmente bater um papo para descontrair… aqui a galera é muito concetrada na atividade… minha opnião, produzem mais do que a gente no Brazil.

Horas extras também é bem raro, eles valorizam muito a família, então o chopp depois do trabalho também não é muito comum entre os nativos…. raramente os estrangeiros fazem um happy hour.

Os chefes não ficarão no seu pé, mas você deve cumprir a sua tarefa no tempo estipulado.

Outra coisa que é bem diferente é o respeito ao horário, se você marcar uma reunião para as 10:00AM, as 9:59 TODOS estarão na sala e as 10:00 comecará a reunião, existe um ditado aqui que é “se você não respeita a hora que é gratuíta, não respeitará um contrato que tem valores!“. Portanto se você planeja vir para Europa, mude o péssimo hábito que nós brasileiros temos com horário.

Em relação a segurança, terrorismo e bla.. bla.. bla… honestamente ainda me sinto muito mais seguro aqui, estatísticamente o transito de São Paulo mata mais do que os atentados ou até mesmo uma guerra, logo você está mais propenso a sofrer algum tipo de atentado a sua vida aí em SP do que aqui na Europa.

Eu ja estava aqui em Berlin no incidente do mercado de natal em Berlin, no dia seguinte ninguém comentava sobre o assunto, ninguém dá ibope para esses malucos…

Agora a parte boa, todos os finais de semana me fazem pensar que fiz uma boa decisão, apesar da saudade da familia, amigos e até de comidas brasileiras 🙂 .

Todo o lugar tem uma praça enorme (e bem tratada) com alguma igreja histótica, ou museu etc… por falar em museu, vi uma reportagem que somente em berlin existem mais de 150 museus!!!!

Então a parte cultural é algo que estou curtindo muito…

O custo de vida aqui é relativamente baixo (exceto o aluguel que é meio carinho), e o transporte público funciona muito bem… ao ponto de dizer que em SP não temos transporte público, temos um meio de locomoção….. aqui você sabe a hora que o transporte chegará ao destino… é religiosamente rigoroso com o horário.

Os carros são relativamente baratos, apesar de não ter a necessidade devido a boa qualidade do transporte público… esta semana vi uma Jaguar xtype seminova por 29K Euros, no BR certamente custaria o valor de um AP 🙂

Eu aluguei uma BMW serie 5 para vir de Frankfurt para Berlin, e tive o prazer de dirigir na Autoban, a famosa pista sem limites de velocidades, na verdade em diversos pontos existem limites sim… (entre 90 e 130KM) depois disto é cada um por si :), lembro que estava a 160Km/H e diversos carros passavam por mim como se eu estivesse a 60 km/H, a pista é muito segura… é algo que todos devem fazer antes de morrer :).

A comunidade Brasileira é muito grande, então você não se sentirá só aqui.

Mas novamente, ser expatriado não é algo fácil, a saudade, depressão, tristeza..etc será algo constante ao menos nos 6 primeiros meses….

2- Como foi o processo de mudança?

Tudo ocorreu através do Linkedin, uma empresa americana me enviou uma proposta, mas como o visto americano demora a sair, me ofereceram uma posição aqui em Berlin, como eu e minha esposa adoramos a Europa, foi fácil decidir.

Após ter o contrato de trabalho em mão, você precisa se aplicar para o visto de trabalho, a Alemanha ainda consegue ser mais burocrática que Brasil, tive que preencher diversos formulários, traduzir documentos escolares e pessoais para alemão (dica, tradução juramentada e você deve apostilar), após isto foi só marcar a entrevista no consulado alemão, no dia da entrevista me foi informado que a resposta do visto demoraria alguns meses, mas para minha surpresa recebi a mensagem após 2 horas 🙂

Depois disto foi só comprar a passagem e correr com burocracia para trazer o cachorro (e é muito burocrático).

Ao chegar aqui, você deve dar continuidade no processo do visto, no Brasil você recebe um visto temporário (geralmente 180 dias) e ao chegar aqui você deve dar entrada no visto definitivo (no meu caso o Bluekart).

Aqui é bem burocrático como eu mencionei, ao chegar aqui você tem 2 semanas para fazer o anmeldung (um tipo de registro na prefeitura), ai começa a saga, para fazer o anmeldung você precisa ter um casa (alugada ou propria) mas para alugar uma casa você precisa ter o anmeldung, ficou fácil explicar o deadlock 🙂

Eu aluguei um airbnb e pedi para o landlord assinar o meu anmeldung, após isto começa o outro processo chato que é alugar a casa, que é bem diferente do Brasil. Aqui eles anunciam a casa e agendam um dia especifico para a visitação, neste dia terá várias familas olhando media de 6 familias, algo insano mesmo… ai o dono do imóvel vai escolher para quem ele quer alugar!!!!

Então se você ja sabe que sofrerá um pouco para alugar um casa…..

Bom, foi bem resumido, mas acredito que servirá como exemplo para quem pensa em expatriação.

Dica do Marcelo:

Se você preencher TODOS os requisitos abaixo, você está apto a ser expatriado, caso contrário, volte ao estudos e se prepare um pouco mais.

[  ] how about your English skills?
Sem inglês, esquece… nunca será expatriado, a não ser que vá para paises lusofonos.

[  ] Universidade concluída.
Outro ponto importante, o visto depende muito da universidade e tempo de estudos, geralmente o Tecnólogo não é aceito, se você tem tecnologo, seria interessante fazer uma pós em uma boa faculdade… talvez passe um pano na falta de um curso com formação minima de Bacharel.

[  ] Quero mudar de vida, não ficar rico.
Europa tem muita oportunidade, mas ficar rico do dia para noite só sendo político no Brasil. Os impostos aqui são bem elevados, mas você tem tudo de volta em forma de serviço….

[   ] Consigo viver longe da família.
Se você tem a necessidade de ver sua familia todos os finais de semana, talvez isto pesará no seu sucesso na expatriação.

[  ] Respeito a cultura e diversidade dos outros.
O Europeu nao liga muito para mostrar que tem dinheito, pelo contrário ele não gasta, ele poupa muito, ele preza pelo seu conforto  e ideologia, entao ele anda como quer, veste o que quer, e ninguém o condenará por isto.

Existem muito mais pontos, mas se você conseguiu assinalar todos estes itens, meus parabéns, agora só lhe resta a job offer o Linkedin pode te ajudar.
Aqui em Berlin existe muita oportunidade.

 

Bom é isto por enquanto, caso tenham mais dúvidas, me mande mensagem… ficarei feliz em ajudá-lo….

 

Abraço

Marcelo Fernandes