This post will be focussing specifically on working of CPU scheduler in Default, SCA v1 and SCA v2 modes in 6.7 U2 and later. VMware vSphere 6.7 U2 added new scheduler options (SCA v2) which provides security for L1TF vulnerability, while retaining as much performance as possible. Note: SCA is the abbreviation for Side Channel … Continue reading vSphere 6.7 U2 & later CPU Scheduler modes: Default, SCA v1 and SCA v2
In this post, we are going to discuss about memory compression cache technique used by ESXi host. In previous posts we have already discussed TPS and ballooning. So compression is the next technique in order that gets initialized when ESXi host is under memory contention. ESXi provides a memory compression cache to improve virtual machine … Continue reading VMware vSphere 7.x Memory Reclamation-Part 5: Memory Compression Cache
As discussed in previous post Part-1: Basics, we have two types of switches that are available in vSphere i.e. Standard switch and Distributed switch. So in this post we will explore these switch types. But before we do that, let's dive into basics of switches in virtual architecture first. What is a virtual switch? A … Continue reading Uncovering Virtual Networking Part-2: Virtual Switches
Welcome everyone to this series on vSphere virtual networking. This is going to be a long series due to the vast scope of configuration In this series, we will explore concepts related to vSphere virtual net possibilities in vSphere virtual networking. The reason of doing this series is basically to let everyone (specially beginners) understand … Continue reading Uncovering vSphere virtual networking Part-1: Basics
Just think about your patch management process. You may need to reboot your ESXi hosts during the process. Host reboots may not be performed frequently and not all patches require host to be rebooted. However, when activities such as critical patch or driver installation are performed, we may have to reboot the host. Now the … Continue reading What is ESXi Quick Boot?
We will discuss about VMFS filesystem and VMFS locking mechanisms in this post along with VMFS 5 and VMFS 6 characteristics in vSphere 7. Also we will discuss VMFS upgrade possibilities from VMFS 5 to VMFS 6. VMFS 5 VMFS 5 and 6 do share most of the characteristics except few like sub block sizes,drives. … Continue reading VMFS 5/6 and VMFS locking
In continuation to previous post on ESXi 6.5 password policy, Let us understand the changes (if any) in password policy in ESXi 7. I have tried to simplify the ESXi password policy as much as possible. ESXi uses the Linux PAM module pam_passwdqc for password management and control. We can change the required length, character class requirement, or … Continue reading ESXi 7 Password policy