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VMware recommends having 3 or more physical NICs in a team for beaconing to work properly. If you have only 2 uplinks in a team, ESXi host will not be able to correctly determine which uplink has gone down.read more
Beacon probing is a network failover detection mechanism provided by VMware to detect upstream switch failures & also use to keep the track of health state of each uplink configured in a team.read more
Administrator has to configure link failure detection mechanism as part of teaming policy to detect uplink (pNIC0 and pNIC1) failures.
Considering this topology, which link detection mechanism would you recommend vSphere admin to configure in below mentioned failure scenarios:
1. Link Failure between Access and Distributed switch
2. Link Failure between Distributed Switch and Core Switch.
An Initiator is the storage device/endpoint that initiates SCSI request. Typically, Initiator serves the same purpose what SCSI adapter does. The only difference is, instead of physically cabling SCSI devices (like HDD, Tape Drives), an SCSI initiator send SCSI commands over an IP/Fiber Channel network.read more
A VMware Virtual Switch is Layer-2 Switch embedded in VMkernel itself. It’s a software switch runs under the control of the ESXi Hypervisor and responsible for providing all network-based communications with and within an ESXi Host System.read more
Below mentioned Out of 4 Scenarios, which all scenarios depicts correct IO path in vSphere Networking.read more
Pluggable storage architecture was one of the major enhancement done by VMware to provide two key functions of the storage component in vSphere world.
• Multipathing: If there are multiple paths, which paths should be used for given I/O
• Failover: When a path goes down, I/O should failover to alternative path automatically.
The connection from the server through the HBAs to the Storage Controller is referred as PATH. Multipath Connectivity refers to a system configuration where multiple connection paths exists between Server and Storage Device called LUNs within a Storage Subsystem.read more
In this article, we will be discussing about commonly asked questions like:
1. What is Zoning and Why do we need it?
2. Difference between Soft Zoning and Hard Zoning?
3.On which component of Datacenter, Zoning is defined at?
4.What is LUN masking and Why do we need it?
5.How LUN masking is different from Zoning?
6.Where do we configure LUN masking?
When single resource is being shared across multiple objects/Users then we need some control mechanism for helping us to avoid any kind of confliction/unnecessary congestion while claiming that resource. That’s what exactly being solved by Reservation.
Reservation restrict other users to claim resource which is already being allocated or used by another user.
ALUA is type of storage device that is capable of servicing IO to given LUN on two different Storage Processors but in an uneven manner. ALUA is also known as Asymmetric Active/Active Arrays. Active/Active -> Both the Controller ports receives IO Commands to LUN. Asymmetric -> Only one controller which is owning the LUN can issues IO to that LUN.read more
I will be discussing few more useful Storage Commands widely used in Troubleshooting Storage issues or Configuring & Managing Storage devices in vSphere Environment. These command used to retrieve information about HBA installed on ESXi host.read more
In this post, I am going to explain one of the most frequently used storage commands help vmware admin to retrieve information particularly about Storage device, Multipathing information about LUN, Queue Depth & Troubleshooting storage issues.read more
Similar to esxcfg-*, vSphere has another Command Line API called “ESXCLI-*” which allows system admin or ESXi shell user to configure, manage & troubleshoot vSphere issues. In this article, we’re going to focus mainly on vSphere Networking related commands & we’ll be setting up basic ESXi Network configuration using ESXCLI-* commands.read more
Check out this Article to know about creating & configuring ESXi Networking using CLIs. This Articles deep-dive into step by step procedure of creating and deploying vSphere Networking on ESXi Host using esxcfg-vswitch APIs.read more
VMware is having two different CLIs called esxcfg-* and esxcli network * for managing and configuring ESXi Networking. In this Blog, we are going to discuss about esxcfg-nics and esxcfg-vswitch API to retrieve info about vSwitch and NIC cards installed on ESXi Host.read more
Virtual Networking is one of the Key components of Datacenter. If all your Critical VMs running on highly redundant & high speed SAN or Ethernet Network but if VMs can’t communicate with each other then everything is useless.read more
A VMware Virtual Switch is Layer-2 Switch embedded in VMkernel itself. It’s a virtual network living inside ESX Kernel providing interconnectivity between VMs and the external physical Network via Standard Networking Protocols.read more