Some description of EC2 Internals. EC2s are XEN VMs, mine is currently using Xen 3.0.3-rc5-8.1.14.f , which appears to be
F14 Xen package re-build on RHEl5.x (this is by looking at compiler version) . Some info in the article appears to a bit o…
Posted in amazon, architecture, aws, cloud, ebs, ec2, infrastructure, internals, Linux, xen | Comments Off | permalink
Postmortem for the April-2011 EC2/EBS outage. It looks like a human errors plus unfortunate cascade of events lead to a requests storm that brought down EBS storage. Also, it appears that Amazon mis-estimated spare storage capacity needed for recov…
Posted in amazon, aws, cloud, cloudcomputing, ebs, ec2, outage, postmortem, sysadmin | Comments Off | permalink
“The history of every major tech startup tends to pass through three distinct and recognizable phases, those of Survival, Inquiry and Sophistication, otherwise known as the How, Why and Where phases.
For instance, the first phase is characterized by t…
Posted in funny, humor, startup, technology | Comments Off | permalink
[a blog post with ] good explanation about how failover happens in round-robin DNS setups. i.e. it is safe for browsers and most modern http-client libraries, but probably is not safe for other protocols
Posted in dns, fail-over, loadbalancing, network, round-robin | Comments Off | permalink
blog posts that describes how MySQL InnoDB flushes data to disk (also see bgwriter, checkpoint_* parameters in PostgreSQL)
Posted in buffers, database, dba, inn, innodb, mysql, percona, performance, postgresql | Comments Off | permalink
Why Software and Patents Need To Get a Divorce~ by PolR. Long article posted by Groklaw website that presents a view point that software is really a mathematics and thus cannot be patented. Also this article presents the legal system’s view of compute…
Posted in intellectual_property, law, legal, paper, patents, software | Comments Off | permalink
Sysbench-based benchmark comparing OLTP workloads for different builds and forks of MySQL on 64-core intel machine (Quad Intel Xeon L7555 ) . Only one definitive result is that MySQL cannot scale beyond 8 or 16 cores, or in some cases beyond just 2 cor…
Posted in benchmark, intel, Linux, mariadb, mysql, percona, performance, scalability | Comments Off | permalink
empirical data about difference in index sizes depending on the data type
Posted in data, dba, index, postgres, postgresql | Comments Off | permalink
Slides from Adrian Cockcorft, Netflix director of cloud systems about current state [for 2011] of Netflix’s AWS-based architecture
Posted in amazon, architecture, aws, cloud, cloudcomputing, ec2, monitoring, netflix, simpledb | Comments Off | permalink
Notes from netflix tech blog about some key points of their EC2-based infrastructure design. Note that netflix is not affected by the current EBS problems in AWS US-EAST region. Their key point seems to be to equally split your infrastructure betw…
Posted in amazon, architecture, aws, cloud, cloudcomputing, ec2, netflix, scalability | Comments Off | permalink
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