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Troubleshooting latency spikes on ESXi NFS datastores
I’m experiencing fsync latencies of around five seconds on NFS datastores in ESXi, triggered by certain VMs. I suspect this might be caused by VMs using NCQ/TCQ, as this does not happen with virtual...
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Akamai vs smaller CDN for small/medium-size ecommerce traffic? (caching,...
The small/medium sized online retail company I work for uses Akamai as our CDN for static images, but I’m wondering whether it might be hurting rather than helping and, if it’s suboptimal, what we...
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Fastest secure machine-machine network configuration
We currently host a large number of our application servers in a 3rd party data centre. Connectivity is then provided to our users across Europe through the vendor’s network. These machines run...
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finding the best network latency between two countries
I know there are many tools to test for bandwidth and latency, but they all rely on having at least one host from which you can run those tests. I wonder whether there’s an online source or some other...
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Combining Heroku with custom external services (e. g. Varnish or Postgres on...
I’m planning to set up a Django site on Heroku. It will run on Heroku’s Cedar stack, which allows Python apps, but doesn’t include or support HTTP upstream caching with Varnish like the other stacks...
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Need help troubleshooting highly variable ping times
I’m at work using Citrix (think Remote Desktop) to connect to client sites. With my job I have to write a fair bit of code while I’m connected remotely via Citrix, so the latency of my internet...
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Esxi iSCSI slow
I have a server with ESXi 5 and iSCSI attached network storage(4x1Tb Raid-Z on freenas). Those two machines are connected to each other with Gigabit ethernet, and a procurve switch in between. After a...
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Geographic testing for latency
Really struggling to find tools that report latency loading a website from multiple geo-graphic locations. Are there such tools? I have begun replicating infrastructure in other EC2 regions, but find...
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Does a 150ms latency is good enough to launch a product (USA hosted in Europe)?
Having worked for weeks on a new mobile app product, we are finally preparing a public launch in the coming weeks. However we wonder if our Europe based servers will be good enough (latency, etc.) for...
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Data obtained from ping: is it round trip or one way?
I have 2 servers, each in two separate locations. I need to host an application on one, and the database server on the other. From the app server, if I ping the database server, on average I get about...
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