Category: Data Center

RedHat 0

Operating System

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 store its information in udev database. In case of network devices, udev relies on MAC addresses to assign persistent names to the devices. The MAC address based naming rules are stored in “/etc/udev/rules.d/70-persistent-net.rules”.

RedHat 0

Operating System

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 a central registration authority or coordination between the parties generating them. The probability that a UUID will be duplicated is not zero, but is so close to zero as to be negligible. Thus, anyone can create a UUID and use it to identify something with near certainty that the identifier does not duplicate one that has already been created to identify something else, and will not be duplicated in the future. Information labeled with UUIDs by independent parties can therefore be later combined into a single database, or transmitted on the same channel, without needing to resolve conflicts between identifiers.

Oracle VM 0

Server Virtualization / How To

Oracle VM Server – Log Files

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 log files locations are listed in the following table: Log File Directory Description xend.log /var/log/xen/ Contains a log of all the actions of the Oracle VM Server daemon. Actions are normal or error conditions. This log contains the same information as output using the xm log command. xend-debug.log /var/log/xen/ Contains more detailed logs of the actions of the Oracle VM Server daemon. xen-hotplug.log /var/log/xen/ Contains a log of hotplug events. Hotplug events are logged if a device or network script does not start up or become available. qemu-dm.pid.log /var/log/xen/ Contains a log for each hardware virtualized guest. This log is created by the quemu-dm process. Use the ps command to find the pid (process identifier) and replace this in the file name. ovs-agent.log /var/log/ Contains a log for Oracle VM Agent. osc.log /var/log/ Contains a log for Oracle VM Storage Connect plug-ins. ovm-consoled.log /var/log/ Contains...

Oracle Help Center 1

Operating System

Oracle Help Center

Let me guess, you want to know something about Oracle Linux, you will google it! Want to know something about Oracle VM, so you will google it but do you know that you can find all information about Oracle products in a library? Yes, you can find many useful information or download them as different type of documents from Oracle Help Center. There is some categories for all documents and you can find your documents faster: Cloud Application Middleware Database Big Data Enterprise Manager Engineered Systems Java Servers Networking Virtualization Storage Operating Systems Industries

Oracle VM 0

Server Virtualization / How To

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

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 performance issues. So calculating dom0 memory is very important for preventing performance issues on your virtual machines. Also you can change dom0 memory size by the below instruction: Edit your grub configuration on the Oracle VM Server to adjust the value for the dom0_mem parameter. If you are using UEFI boot, the grub configuration file is located at /boot/efi/EFI/redhat/grub.cfg, otherwise the grub configuration file is located at /boot/grub2/grub.cfg. Edit the line starting with multiboot2 /xen.gz and append the required boot parameters. For example, to change the memory allocation to 1024 MB, edit the file to contain: multiboot2 /xen.gz dom0_mem=max:1024M placeholder ${xen_rm_opts}

RedHat Labs Application 0

Operating System

Red Hat Access Labs – Review

What’s Red Hat Access Labs? Red Hat Access Labs is a package of online application that you can use them to generate configuration files, bash script to detect vulnerabilities, analyzing issues and … .  The online applications are created by RedHat engineers to help you improve performance, troubleshoot issues, identify security problems, and optimize configuration. You can access to the application via the below link: https://access.redhat.com/labs Also you need to valid username on RedHat web site to access to the lab.

Backup Solutions – Oracle VM 0

Backup & Replication / Server Virtualization

Backup Solutions – Oracle VM

You will need to a backup solution in virtual environments same as physical environments. There is many backup solutions for VMware vSphere, Nakivo or Veeam are third-party solutions. Also Veeam is best third-party solution Hyper-V platform. But if you are implementing Oracle VM, you need to know, what is best backup and restore solution for this platform. Below are some partners with currently supported data protection solutions: Acronis with Acronis Backup Advanced Actifio with Actifio Sky. Actifio Sky for Oracle Cloud is  available in Oracle Cloud Marketplace Asigra with Asigra Cloud backup Zmanda, a Carbonite company with Amanda Enterprise Arcserve with two backup products: Arcserve Backup and Arcserve Unified Data Protection Barracuda Networks with Barracuda Backup CloudBerrry Lab with CloudBerry Backup. CloudBerry Explorer provides a user interface to Oracle cloud storage Commvault with Commvault Software (formerly Simpana) Dell with Rapid Recovery and NetVault EMC with its Data Protection Suite (DPS), with Avamar and NetWorker as key components FalconStor Optimized backup (VTL & NAS) Hewlett Packard Enterprise’s Data Protector; StoreOnce R1Soft  with Server backup Manager SEP with Sesam Storware with vProtect Storix System Backup Administrator Veritas Technologies with Backup Exec and  NetBackup, available in the Oracle Cloud Marketplace

VI Keyboard Shortcuts – Cheat Sheet 0

Operating System

VI Keyboard Shortcuts – Cheat Sheet

VI If you are familiar with Linux shell, I’m sure that you have used “vi” for editing your documents but the tool is very difficult, if you are beginner in Linux. I want to share some keyboard shortcuts that you can use for edit your files faster. Quitting : x Exit, saving changes :q Exit as long as there have been no changes ZZ Exit and save changes if any have been made :q! Exit and ignore any changes Inserting Text i Insert before cursor I Insert before line a Append after cursor A Append after line o Open a new line after current line O Open a new line before current line r Replace one character R Replace many characters

Ballooning Problem 0

Server Virtualization

Memory Ballooning Problem – Windows Server 2008 R2

 it seems, there is incompatibility issue between Windows Server 2008 R2 and VMware Ballooning driver and it’s cause of stop error on Windows: Stop A: 0xA As Microsoft describe in its KB, the issue is happening when ballooning activated on virtual machines that use NUMA. So, we know that NUMA can improve our machines performance by grant local access to memory. You can read my post about NUMA for more information: NUMA and vNUMA: Back to the Basics for Better Performance Microsoft has released a hotfix for fixing this issue on Windows Server 2008 R2. It’s strongly recommended to download and install the hotfix on all your virtual machine that those have Windows Server 2008 R2 as guest OS. You can download the hotfx from the below link: Hotfx Download

vSphere 6.5 0

Server Hardware / Server Virtualization

Supported Servers – vSphere 6.5

Which server brand do you use? HPE, Dell, Fujitsu or any other. It doesn’t matter, you should check your server compatibility with new vSphere version before planning for migration or upgrade. I don’t want to share server list because the list will be different during time and new servers will be added to the list. You can find supported servers in VMware Compatibility Guide and it’s best reference for servers compatibility. Also you can check it on OEM web sites: HPE: VMware Support Matrix Just you should choose your ESXi version on the web page and trust to the result! Dell: Virtualization Solutions Choose VMware ESXi version and then should click on “Manual” and download a PDF which contains list of compatible servers. Cisco:UCS Hardware and Software Interoperability Matrix Tool (New) just you should select some items to find proper result. Also you can use older tools: Hardware and Software Interoperability Matrix Utility Tool Fujitsu: I couldn’t find a tools on their web site and we have to download a PDF file and find our product. Sample link for FUJITSU Server PRIMERGY: x86 Servers released OS Lenovo (IBM): OS Interoperability Guide I know, there is more OEM vendor and may...

vSphere 6.5 0

Reviews / Server Virtualization

VMware Hardware Version 13

Each new version of vSphere includes some improvements and new features and many of them will be applied on virtual machines. The improvements and features will be add to “Hardware Version” and you be able to use those, if you use latest “Hardware Version”. It’s strongly recommended that don’t upgrade your hardware version to latest just when you need to use a specific feature or expand hardware resources that older hardware version doesn’t support that. Because “Hardware Version” doesn’t have any compatibility with older ESXi and if you have mixed cluster, you can’t use latest hardware version. Here is an example: You have a cluster and the cluster contains some ESXi 6.5, 6.0 and 5.5. If you upgrade hardware version to 11, your virtual machine will be hosted by ESXi 6.0, ESXi 6.5 and the machine will not be migrated on ESXi 5.5. So, keep your hardware version compatible with oldest ESXi in your environment. You can downgrade hardware version but it’s not recommended. For make sure about hardware version, you can change default version on your cluster anytime. Let’s review new hardware version, compare it with older versions and compatibility with ESXi: Feature ESXi 6.5 and later ESXi 6.0...

vSphere 6.5 0

News / Server Hardware / Server Virtualization

Deprecated and unsupported – Qlogic and Emulex devices

VMware has published a list that includes unsupported and deprecated devices from two vendors: Emulex Qlogic Deprecated devices may still be worked and drivers will be installed but those devices are not supported on vSphere 6.5 officially. You need to upgrade your hardware before upgrading vSphere, but it’s your choice! Because your device may be worked without any issue. You can find the deprecated and unsupported devices in the below table: Partner Driver Name Device IDs Device Name Emulex lpfc 10DF:F0E5:0000:0000 Emulex LPe1105-M4 4 Dual-Channel 4Gb/s Fibre Channel HBA 10DF:F0E5:0000:0000 Emulex LPe1150 Single-Channel 4Gb/s Fibre Channel HBA 10DF:F0E5:0000:0000 Emulex LPe1150 4Gb/s Fibre Channel Adapter 10DF:F0E5:10DF:F0E5 Emulex LPe1150 Single-Channel 4Gb/s Fibre Channel HBA 10DF:F0E5:10DF:F0E5 LPe1150-E Emulex LPe1150 Single-Channel 4Gb/s Fibre Channel HBA for Dell and EMC 10DF:FE00:0000:0000 LPe11002 4Gb Fibre Channel Host Adapter 10DF:FE00:0000:0000 NE3008-102 10DF:FE00:0000:0000 NE2000-001 10DF:FE00:0000:0000 Emulex LPe11000 4Gb PCIe Fibre Channel Adapter 10DF:FE00:10DF:FE00 Emulex LPe11002 Dual-Channel 4Gb/s Fibre Channel HBA 10DF:FE00:10DF:FE00 N8403-018 10DF:FE00:10DF:FE00 EMC LPe11000-E 10DF:FE00:10DF:FE00 EMC LPe11002-E 10DF:FE00:10DF:FE00 Emulex LPe11000 Single-Channel 4Gb/s Fibre Channel HBA 10DF:FE00:10DF:FE22 Emulex L1105-M Emulex LPe1105-M4 Dual-Channel 4Gb/s Fibre Channel mezzanine card for Dell PowerEdge 10DF:FE00:103c:1708 403621-B21 Emulex LPe1105-HP Dual-Channel 4Gb/s Fibre Channel mezzanine card for HP BladeSystem c-Cl 10DF:FE00:10DF:FE00 A8002A – FC2142SR Emulex...

vSphere 6.5 0

Server Virtualization

Supported Update Sequence – vSphere 6.5

You can find VMware products which are compatible with vSphere 6.5 on the below post: Compatible VMware Products – vSphere 6.5 If you need to update the mentioned products, you should upgrade the products according to the below sequence table. Please consider that: You should start with lowest sequence number. If you need to update products with same sequence number, order doesn’t matter. Before you update vCenter Server, disable vCenter Server from vCloud Director. Also ensure that you stop or disable other VMware services so that they do not communicate with vCenter Server during the update process. PSC / SSO External  vRA VCM vRB vCD NSX Manager NSX Controllers View Composer View Connection Server VDP vCenterServer vRO VR VUM vROPs VIN vCC vRLI BDE SRM ESXi VSAN VMware Tools NSX Edge NSX LFw NSX Guest IDS View Agent / Client Seq. 1 2 2 2 3 4 5 5 6 7 8 9 9 9 9 9 10 10 10 10 11 12 12 12 13 13 13   Sample VMware product upgrade scenarios 1st Scenario: VMware Horizon View If applicable, upgrade the External vCenter Single Sign-On / Platform Services Controller instance (sequence step 1) Upgrade View Composer (sequence step 5)...

vSphere 6.5 1

Server Virtualization

Compatible VMware Products – vSphere 6.5

vSphere 6.5 has been released and many of users are planning to upgrade their environments to new version. But we should check vSphere 6.5 compatibility with VMware products and even third-party products. We can check compatibility matrix on the below link: VMware Product Interoperability Matrixes But also you can find the products that those are compatible with vSphere 6.5:   Product Latest Available Version Recommended Action Important Links Platform Services Controller (PSC) Note: External Deployment Only 6.0 Update 2 Upgrade to 6.5 Release Notes Update Procedure vRealize Automation 7.0.1 No supported version available N/A vRealize Business for Cloud 7.0.1 7.2 Release Notes Update Procedure vRealize Configuration Manager (VCM) 5.8.5 No supported version available N/A vCloud Director for Service Providers (VCD) 8.0.1 No supported version available N/A VMware NSX for vSphere 6.2.4 No supported version available N/A Horizon View (View) 7.0.1 7.0.2 Release Notes Update Procedure vCenter Server / vCenter Server Appliance 6.0 Update 2 Upgrade to 6.5 Release Notes Update Procedure vRealize Orchestrator (vRO) 7.0.1 No supported version available N/A vSphere Replication (VR) vCenter Site Recovery Manager (SRM) VR Version – 6.1.1 SRM Version – 6.1.1 Upgrade to 6.5 VR Release Notes SRM Release Notes Upgrading VR Upgrading SRM vRealize Operations...

vSphere 6.5 Maximums 1

Server Virtualization

vSphere 6.5 Configuration Maximums – Compare to Earlier Versions- Part 2

We’ve reviewed some of vSphere 6.5 configuration maximums in the previous post: http://www.teimouri.net/vsphere-6-5-configuration-maximums/ And we’ll review and compare the rest of configuration maximums in this post. Networking Maximums Item vSphere 5.5 vSphere 6.0 vSphere 6.5 vSphere Standard and Distributed Switch Total virtual network switch ports per host (VDS and VSS ports) 4096 4096 4096 Maximum active ports per host (VDS and VSS) 1016 1016 1016 Virtual network switch creation ports per standard switch 4088 4088 4088 Port groups per standard switch 512 512 512 Static/Dynamic port groups per distributed switch 6500 10000 10000 Ephemeral port groups per distributed switch 1016 1016 1016 Ports per distributed switch 60000 60000 60000 Distributed switches per vCenter 128 128 128 Distributed switches per host 16 16 16 Hosts per distributed switch 1000 1000 2000 Cluster and Resource Pool Maximums Item vSphere 5.5 vSphere 6.0 vSphere 6.5 Cluster (all clusters including HA and DRS) Hosts per cluster 32 64 64 Virtual Machines per cluster 4000 8000 8000 Virtual machines per host 512 1024 1024 Powered-on virtual machine 2048 2048 2048 FT virtual machines per cluster 98 128 FT virtual machines vCPU per Cluster 256 256 Resource pools per host 1600 1600 1600 Children per resource...