Davoud Teimouri

Virtualization & Datacenter

Category: How To

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

[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 […]

3,640 total views, 8 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 […]

4,317 total views, 8 views today

[PowerCLI]: ESXi Syslog Configuration via 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 […]

6,701 total views, 6 views today

[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 […]

6,003 total views, no 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.

10,372 total views, 1 views today

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 (= […]

3,424 total views, 3 views today

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. 3,957 total views, […]

3,957 total views, 10 views today

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 […]

2,020 total views, 1 views today

Remove Multipath Device – Map in use!


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 […]

3,168 total views, 6 views today

Installing Arch Linux Using Arch Anywhere – Part 1

Arch Linux is one of most popular Linux distributions and one of most updated Linux distributions. Arch Linux has no graphical or automatic installer for installation and installing Arch Linux is not simple for most new users. During installation, you have to do initialize disk, create partitions, configure boot-loader and other configurations manually. So you […]

6,739 total views, 4 views today

Find HBA Firmware Version in Linux – Easy Way

You need to know, what is version of your HBA firmware to upgrade it or install compatible driver version. There is many ways to find firmware version but I want to share easier way. Just logon to your Linux machine with Sudo user and run the below command:

3,057 total views, no views today Davoud […]

3,057 total views, no views today

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