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Andy's VMware vSphere tip#6: [InstallationError] [Errno 28] No space left on device - updating from 6.5 U1 to 6.5 U2 (possible other versions as well!)
We were updating HPE Proliant Servers Generation 8 [G8], and it would appear as of writing HPE have still not released a Gen8 ESXi 6.5 U2 Image! So we had to use 6.5 U1 and updated to U2. [Please note always use the OEM version of ESXi for vendor servers, e.g. HPE, Dell, IBM/Lenovo, Fujitsu etc]
Andy's VMware vSphere tip#4: Partitions :- OS Partitions have no place in VMware vSphere or Hyper-V. So do not create a C: Partition or volume, and D: Partition or volume on the same virtual disk. We used partitions in the dark old ages of DOS, when the limits of a partition were 32MB, so we had to create multiple partitions on our disks, to use all the disk space.
Keep a single partition per virtual disk. e.g. create a single virtual disk for C:, if you need a D; create another virtual disk.
You will thank me in the future, because it becomes much easier to expand C: and D:, if they are on separate virtual disks. You've also got the benefit of being able to specify which datastore, these will be hosted on which is important if you have tiered storage for performance.
So in Summary do not create partitions, C: D: E: F: on the same virtual disk, you will regret it, later and then you will have to use VMware Converter, to convert your machine and remedy the situation.
Andy's VMware vSphere tip#5: Best Practice and Security Hardening ? HOW... easy as 1...2...3...
How about using some Automated VMware expertise, like having a VMware Consultant on hand, every minute of the day to ensure your VMware vSphere environment, is following best practices and security hardening guidelines to protect your environment, also has the ability to monitor VMware vSphere Hypervisor logs in real time for VMware KBs. We've been using and following this small startup for a few years now. Let me introduce you to Runecast Analyzer.