Davoud Teimouri

Virtualization & Datacenter

Category: Server Virtualization

VMware vSphere, Microsoft Hyper-V, Citrix Xen Server, Oracle VM Server, Red Hat KVM.

ESXi Fails with “Corruption in dlmalloc” on HPE Server

Corruption in dlmalloc

“Corruption in dlmalloc” issue occurs because multiple esxcfg-dumppart threads attempt to free memory which has been used for configuring the dump partition. Thread A checks if there are entries to be freed and proceeds to free them, while within the same time frame, Thread B is also attempting to free the same entries.
Based on VMware KB2147888, this issue is resolved on ESXi 6 U3. But why issue is happening on ESXi 6 U3 or ESXi 6.5 U1 when they are installed on HPE ProLiant servers?

46 total views, 9 views today

NAKIVO Backup & Replication v8.1

Nakivo Universal Object Recovery

There is no need to introduce Nakivo for my reader at begin of each post. Nakivo is one of leaders in backup & replication market now. I writing reviews about Nakivo Backup & Replication since version 6.x. All new version had new amazing and useful features. Nakivo Backup & Replication v8.1 comes with two new features as well. In addition of new features, Nakivo Backup & Replication v8.1 has come with lot of improvement and fixes. Let’s review new features, improvements and fixes.

80 total views, 2 views today

Operating System Level Virtualization (Part 2) – Implementations Comparison

Linux Container

These days, everyone knows what’s Cloud Computing and cloud based services are using for speedup deployment of organizations services. Operating System Level Virtualization or Containers helping system architectures and administrators to achieve the goals. There are many implementations for containers that today, those methods are compatible with different hardware architectures and operating system.

You may know that Unix has OS Level Virtualization from past years and this technology is very older than other virtualization such as Full Virtualization or Paravirtulization.

Full Virtualization (VMware ESXi, Hyper-V) and Paravirtualization (Xen, UML) provides different guest OS but there is no way to use different guest OS when you are using containers. Of curse, some solutions are under development.

1,339 total views, 2 views today

Guest Connected vs RAW Device Mapping (RDM)

iSCSI vs Fiber Channel

RAW Device Mapping (RDM) is one of oldest VMware vSphere features which introduced to resolving some limitation on virtualized environments such as virtual disks size limitation and deploying services top of fail-over clustering services.

You can use a raw device mapping (RDM) to store virtual machine data directly on a SAN LUN, instead of storing it in a virtual disk file. You can add an RDM disk to an existing virtual machine, or you can add the disk when you customize the virtual machine hardware during the virtual machine creation process.

1,906 total views, 3 views today

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