Davoud Teimouri

Virtualization & Datacenter

Category: How To

Virtualization Tutorials, Operating System Tutorials, Software Tutorials And Other IT Tutorials

[Script]: Check Time Synchronization with Host on Virtual Machines – PowerCLI

PowerCLI

How to Check Time Synchronization with Host on Virtual Machines via PowerCLI As you know, virtual machines can sync their time with ESXi host when VMware Tools is installed on the virtual machines. Also the configuration should be enabled on virtual machine configuration manually. The configuration is available on “Virtual Machine Properties”: If there is […]

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[How To]: Resolve Soft Diagnostic Failure – HP EVA

HP EVA Soft Diagnostic Failure

Soft Diagnostic Failure A soft diagnostics Error will typically be present after an intentional or unintentional restart of one or both HSV controllers. It will be logged in the controller event log and displayed in command view Enterprise Virtual Array (EVA) as yellow exclamation mark. The EVA will be operational. This error can be present […]

4,693 total views, 2 views today

[How To]: Change Linux IP Address via PowerCLI

PowerCLI

How To Change Linux IP Address via PowerCLI There is some reason that you want to change IP address on virtual machines as an example, moving virtual machines to a new VLAN or port-group or moving them to another site or replicate virtual machine to an offsite recovery site. Changing IP on machines one by […]

7,854 total views, 2 views today

[How To]: Veeam ONE – Controlling VM Disk I/O

Veeam ONE Alarm - Define Rule

Controlling VM Disk I/O By Veeam ONE Alarm Controlling resource usage by the metrics, it’s a key to keep your virtual infrastructure up and optimized and also keep your customer happy. Veeam ONE alarm will help you to controlling the metrics and resources. Before create the alarms, we should know why I/O is important to […]

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[PowerCLI]: ESXi Syslog Configuration via PowerCLI

PowerCLI

What’s Syslog? Syslog is a standard for message logging. It allows software to generating messages with a standard format and store the messages as log files on a local disk or shared storage for analyzing and troubleshooting. Syslog has two standard components: Syslog Client Syslog Server Syslog client is a software agent for collecting the […]

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[How To]: Linux Cat Command – Usage and Examples

Linux Cat Command - Create New File

Linux Cat Command Cat or “concatenate files and print on the standard output” is a Linux command to print file content on the standard output like screen. This is one of most popular Linux commands. I think that every Linux administrator has executed the below command at least one time 😉 :

So this […]

6,556 total views, 2 views today

[How To]: Restart Unisphere Management Server

EMC Unisphere is a web based management GUI for managing EMC VNX family and actually, this is Java web application that hosting by a Windows. Sometimes, the management server shows incorrect status for disks, RAID Groups or LUNs. As an example, there is no faulty disks on array enclosures but LUN health status is marked as faulted. Restarting Unisphere management server is one of solution for resolving such that issue.

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kernel: WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xbb/0xe0 – Oracle Enterprise Linux

Most of modern servers hardware are using UEFI instead of legacy BIOS and modern OS has dedicated partition to stores boot and EFI values. Some times, the partition gets full or OS generate the below log: kernel: WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xbb/0xe0 Kernel includes a CONFIG_EFI_VARS_PSTORE feature, and a feature that dumps kernel message log (= […]

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Monitoring Temperature And Fan Speed In Linux By LM-Sensors

What’s LM-Sensors Health monitoring is very important for critical servers because administrators can do proper actions before any impact on service. There is many third-party software for monitoring Linux and Windows servers but native agents are also useful. We are going to review one of native solutions for hardware health monitoring in Linux. 5,397 total views, […]

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Find, Convert And Compare, VMware Virtual Machine And Windows Guest UUID

What’s UUID? Each virtual machine has UUID and it will appear on OS as guest UUID too. A universally unique identifier (UUID) is a 128-bit number used to identify information in computer systems, the 16 bytes of this value are separated by spaces. Microsoft uses the term globally unique identifier (GUID), either as a synonym […]

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Remove Multipath Device – Map in use!

Multipath

Multipath Device, Remove From Linux Based on Red Hat solution (https://access.redhat.com/solutions/47438), the below steps should be done before flush any multipath device, otherwise the command will be failed: Locate any subsystem or process holding the multipath device open. For any subsystem or process holding the multipath device open, stop the process, or issue commands to […]

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