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esx Archives - AWS Managed Services by Anchor

VMware ESX Guest Disk IO

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Knowing the state of your disk IO latency in VMware ESX can help you pre-empt performance & capacity issues before the occur. There are a few guidelines you should keep in mind. These notes are directed towards people using directly attached storage. Write latency should be 0, because you have that fancy battery backed controller caching writes, right? Read latency should be under 8ms. Use the smallest stripe size possible for your RAID array setting. This helps keep random IO performance acceptable at the cost of some sequential performance. Do not virtualise very heavy random IO workloads on shared arrays, other guest VMs wont like you for it. Unless you have a very compelling reason not too, use RAID 10. Some other notes, specific to Linux guests are: Mount file…

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Firewalling VMware ESX for console access

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One of Anchor’s more recent product offerings is VMware-based virtual private servers. As one of my colleagues has already detailed, we take extra measures to secure the VMware host server to reduce the possibility of a compromise. Our VPS offering uses VMware ESX, which runs on bare metal and doesn’t have a host operating system. This isn’t the full story – according to documentation it boots a Redhat Enterprise Linux 3 system, then loads the vmkernel which is where the real work is done. One of the nice things about this approach is that there’s a userspace environment in which to run support software, like good monitoring components. We ran into an odd problem recently with an ESX host server on a dedicated network segment, namely that we couldn’t view…

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VPS – Virtual Private Servers now available

By | Company News, Technical | No Comments

After dabbling with a variety of different virtualisation technologies over the last 2 years we’ve launched a Virtual Private Server (or VPS) offering based on VMware ESX server. We’ve chosen ESX server for a number of reasons not to mention the ability to perform a sufficient level of monitoring on the host system and have the virtual machines behave in just about every respect the same as a traditional dedicated server would. A VPS can offer a more affordable step between shared web hosting and dedicated servers but it also creates a more flexible hosting environment. Additional resources can be added to a server with as little effort as a reboot, and they can be added rapidly (hours vs days) in the event that increased performance is needed at short…

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