Davoud Teimouri

Virtualization & Datacenter

Category: How To

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

[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 […]

1,621 total views, 173 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 […]

5,952 total views, 115 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 […]

5,561 total views, 102 views today

HOW TO: Restart Unisphere Management Server

Why 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 […]

10,248 total views, no 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 (= […]

3,194 total views, no 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. 3,477 total views, […]

3,477 total views, 2 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 […]

1,852 total views, 2 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 […]

2,377 total views, 4 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 […]

5,930 total views, 8 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:

2,847 total views, 5 views today Davoud TeimouriDavoud […]

2,847 total views, 5 views today

Change Network Device Name Permanently – RedHat

Device Naming Device name management is handled by udev system. When Linux kernel discovers a new device (e.g., a network interface card) added to the system, it notifies udev daemon of the device event. The udev daemon will then match various device attributes against a set of rules to identify the device, name it, and […]

1,777 total views, 2 views today

Generate Ethernet Device UUID – RedHat

What’s UUID? A universally unique identifier (UUID) is a 128-bit number used to identify information in computer systems. Microsoft uses the term globally unique identifier (GUID), either as a synonym for UUID or to refer to a particular UUID variant. When generated according to the standard methods, UUIDs are for practical purposes unique, without requiring […]

2,584 total views, 2 views today

Oracle VM Server – Log Files

Oracle VM

Why You Need Log Files? Log files are keys to resolving problems in any IT system, why?! You are unable to troubleshooting without having log files. Any enterprise system must have logging system and logging is very important to IT administrators. Log location is very important for IT administrators even very importantly. Oracle VM Server […]

2,125 total views, no views today

Oracle VM Server – Memory Size of the Management Domain (Dom0)

Oracle VM

Oracle VM Server installer using the below algorithm to set default memory size for dom0: dom0 Memory = 502 (MB) + (Physical Memory (MB) * 0.0205) As an example, your physical server has 256 GB memory, dom0 needs to 5.7 GB memory. If you didn’t assign enough memory to dom0, you will face with serious […]

3,060 total views, 4 views today

Centralized Logs By RSyslog

What’s Syslog? Syslog server is a server for centralizing logs that both enterprise and small businesses using native solution or third-party solution for our log centralization. When you have syslog server in your environment, there is no concern about finding root causes even when you are faced with critical hardware problem. Because you have your […]

2,091 total views, 3 views today

Nakivo Backup & Replication – VM Replication

Create Replication Job - Step 6

Replication You can take backup from your virtual machines by Nakivo Backup & Replication, we have talked about that before. We’ve reviewed some amazing features but now, I want to explain replication feature for you. You can create your replicated VMs in few steps, that’s so easy. Nakivo Backup & Replication needs some requirements and […]

20,281 total views, 96 views today

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