Virtualization Tutorials, Operating System Tutorials, Software Tutorials And Other IT Tutorials
If you have any version of Veeam Backup & Replication for protecting virtual machines in your virtual environment and using vSphere 4 and later, the below problem might happen to you.
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You maybe have to disable or enable vMotion traffic on some VMKernel ports on ESXi for doing some maintenance tasks. Disabling or enabling takes lot of time for many servers in datacenter. You can disable or enable vMotion via PowerCLI by run a simple script.
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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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There is a standard way to configure iLO for HPE ProLiant servers, HPE iLO can be configured after boot-up via SETUP utility on all type of servers and generations. If you press [F8] during boot-up, iLO configuration utility will be appeared and then you can configure all iLO configuration such as network connection.
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VMware has explained the solution on this KB article: https://kb.vmware.com/s/article/1035107
To resolve this issue:
Restart the system.
During the reboot, when the hypervisor screen appears, press Shift+O.
In the boot option, type overrideDuplicateImageDetection and press Enter.
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Post Error: 333-HPE RESTful API Error – Unable to communicate with iLO FW. BIOS configuration resources may not be up-to-date. Action: Reset iLO FW and reboot the server. If issue persists, AC power cycle the server.
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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 […]
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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 […]
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“Cabling is inconsistent between SPs” is a fault on storage system and it’s related to SAS cables between DPE and DAEs.
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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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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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Shell Access via VI or VIM Why do you need to access shell via VI or VIM? A: sometimes, you have to copy result of a commands and paste those results to editor. For example, you are configuring SCSI devices as DM-Multipath devices, you have to run some commands like “multipath -l” for see “WWID” […]
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Linux tac Command tac command practically is reverse version of cat command. It means, any result in cat command will be reversed by tac command. tac is lesser known and less used command in Linux but I want to show you the command usage and some examples. Usage and Examples tac command has few options […]
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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 😉 :
1 | # cat /var/log/messages |
So this […]
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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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Linux shell is most popular than GUI in Linux systems and most of Linux administrators doing their tasks and system configurations via shell. But shell is most difficult than GUI. They do many thing via shell for example adding new disks or partitions for applications and services. Sometimes administrators and users faced with the below […]
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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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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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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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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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