high availability

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Latest blogosphere posts tagged “high availability”

 

• Great Exchange sessions @TechEd 2013

  
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  For as long as I can remember I have been going to TechEd every year, some years to both Tech US and TechEd Europe. The sad par of all these visits have been a trend where the sessions about Exchange has decreased by the years. To my great joy I see that this trend has been broken! A look at TechEd Europe Content ...
  1 week ago

• HybridCluster Launches – Scaling and Self-Healing for Web Hosts

  
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  Last year while talking with Jason Seats, former VP of Engineering at Rackspace and more recently MD of TechStars Cloud, we started talking about existing data centers and what their needs were as they aim to compete with the large cloud players. Quickly we begun to postulate about what a company would look like ...
  2 weeks ago

• Make MySQL clustering work for you

  
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  Read the original article at Make MySQL clustering work for you We’ve told you all about MySQL mult-master replication’s limitations. If you write to two masters it is bound to fail for myriad reasons. Now what? Do what the pros do that’s what. A. Don’t write to both masters Using multi-master replication ...
  2 weeks ago

• Troubleshoot your Exchange 2010 database backup functionality with VSSTester script

  
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  Download Frequently in support, we encounter several backup related calls for Exchange 2010 databases. A sample of common issues we hear from our customers are: “My backup software is not able to take a successful snapshot of the databases” “My backups have been failing for quite a while. I have several ...
  3 weeks ago

• Catching up with Chuck Hollis: A Storage Discussion

  
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  Things are moving fast in the IT world. Recently, we caught up with Chuck Hollis (EMC’s Global Marketing CTO and popular industry blogger ) to discuss a variety of topics including datacenter federation, Solid State Drives, and misperceptions surrounding cloud storage. JTC : Let’s start off with Datacenter ...
  3 weeks ago

• Catching up with Chuck Hollis: A Storage Discussion

  
  — Authority:
  Things are moving fast in the IT world. Recently, we caught up with Chuck Hollis (EMC’s Global Marketing CTO and popular industry blogger ) to discuss a variety of topics including datacenter federation, Solid State Drives, and misperceptions surrounding cloud storage. JTC : Let’s start off with Datacenter ...
  3 weeks ago

• Exchange 2010 Database Availability Groups and Disk Sector Sizes

  
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  These days, some customers are deploying Exchange databases and log files on advanced format (4K) drives.  Although these drives support a physical sector size of 4096, many vendors are emulating 512 byte sectors in order to maintain backwards compatibility with application and operating systems.  This is known as ...
  3 weeks ago

• StoreGrid Clustering Deployment – Some Best Practices

  
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  From managing complex data centers to providing rapid uptime in times of server crashes and also scaling to the dynamic backup industry is no mean a trivial thing for a service provider. We understand that for you MSP’s, failure to provision any of these can mean lost credibility, lost revenues, or worse, lost ...
  3 weeks ago

• The write cache: Swap insanity tome III

  
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  Swapping has always been something bad for MySQL performance but it is even more important for HA systems. It is so important to avoid swapping with HA that NDB cluster basically forbids calling malloc after the startup phase and hence its rather complex configuration. Probably most readers of this blog know (or ...
  4 weeks ago

• No tools to reconcile MySQL with two masters

  
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  Read the original article at No tools to reconcile MySQL with two masters Here’s the last nail in the coffin. We hope this convinces you not to write to multiple masters with MySQL replication. Reason 10 – No tools to reconcile inconsistent masters For all the endless reasons we’ve already outlined MySQL ...
  4 weeks ago

• Temp tables can break replication

  
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  Read the original article at Temp tables can break replication If you’re not convinced yet that writing to dual masters is a bad idea, we have a couple more reasons. 9. Temp tables break replication after restart MySQL’s replication is sensitive to temporary tables. You shouldn’t use them. If your queries ...
  4 weeks ago

• Crashed nodes corrupt your MySQL cluster

  
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  Read the original article at Crashed nodes corrupt your MySQL cluster Writing to two masters is like walking around with a loaded shotgun. Eventually one of your instances will fail and when it does, replications position & synchronization information could easily become corrupt! Reason 8 – Crashed nodes ...
  4 weeks ago

• Transaction isolation breaks when writing two masters

  
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  Read the original article at Transaction isolation breaks when writing two masters Continuing our discussion of multi-master replication, we hit on five more reasons why writing to two masters aka active-active replication is very dangerous. Reason 6 – You lose transaction isolation This may sound like a ...
  4 weeks ago

• Active-active replication reduces operational flexibility

  
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  Read the original article at Active-active replication reduces operational flexibility Among the myriad data integrity and corruption risks associated with active-active replication, you also lose out on configurability and operational flexibility. Reason 7 – Can’t add nodes easily The often touted solution to ...
  4 weeks ago

• Disaster Recovery for Amazon EC2 in a Single Click

  
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  In my journey through the cloud I often come across great new initiatives. The interesting fact is that although the cloud is a pure revolution terms such as SLA, TCO and ROI remain valid, new methodologies and techniques are presented to support them in the cloud. I recently met Uri Wolloch, the founder of N2W ...
  4 weeks ago

• Reconfigure Your Expectations About Cloud Config

  
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  When vendors pitch software, they spend a lot of time demoing and discussing what the software can do, and usually no time exploring how the software gets into a usable state in the first place. The assumption that they hope their prospective customers make is that installation and configuration are straightforward ...
  4 weeks ago

• How to make MySQL multi-master work for you

  
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  Read the original article at How to make MySQL multi-master work for you Coming soon! Want more? Grab our Scalable Startups monthly for more tips and special content. Here’s a sample Related posts:Transaction isolation breaks when writing two masters MySQL requires an authoritative master to build slaves MySQL ...
  4 weeks ago

• MySQL needs single master to check data integrity

  
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  Read the original article at MySQL needs single master to check data integrity MySQL slaves can drift out of sync. Many of our clients are surprised to find some data differences in their replication topology, once we do some checking and sniffing around. Such checks require a single reliable or authoritative ...
  4 weeks ago

• MySQL requires an authoritative master to build slaves

  
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  Read the original article at MySQL requires an authoritative master to build slaves In MySQL database operations, you often need to rebuild slaves. They fail for a lot of different reasons, fall out of sync or crash. When this happens you may find you need to reclone and start fresh. This is normally done by ...
  4 weeks ago

• Limitations of MySQL row-based replication

  
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  Read the original article at Limitations of MySQL row-based replication MySQL offers a few different options for how you perform replication. Statement-based has been around a lot longer, and though it has some troublesome characteristics they’re known well and can be managed. What’s more it supports online ...
  4 weeks ago

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