Explanation about How CPU Limit and CPU Reservation can Slow your VM (if you don't do a proper sizing and analysis)

In this post, I would like to share about CPU limit and CPU reservation configuration in vSphere ESXi virtualisation technology. Actually those features are great (since the configuration also available in vCloud Director (*it will call the configuration in vCenter)). Those features are great if you really know and already consider on how to use it properly. For example, if … Read more

Can Not Connect / Error Connecting to iSCSI SAN

Sorry to disturb the tutorial about cloud native application, just a quick note about the troubleshooting. I found an issue today regarding my iSCSI connection to the datastore. All hosts are all having this error when trying to connect to the SAN. This is because I played with my Lab a lot! and tried to … Read more

STP may cause temporary loss of network connectivity when a failover or failback event occurs (1003804)

Symptoms In a switched network environment which uses Spanning Tree Protocol (STP), you experience these symptoms: An ESXi or ESX host temporarily loses network connectivity when a failover or failback event occurs. Virtual machines temporarily lose network connectivity when a failover or failback event occurs. A VMware High Availability (HA) isolation event occurs after one … Read more

Troubleshooting – Lokasi Log File dari VMware vRealize Automation 6.x

Berikut ini adalah informasi mengenai lokasi logs dari VMware vRealize Automation 6.x Suite (dahulu namanya adalah VMware vCloud Automation Center). Troubleshooting dilakukan dengan membaca/menganalisa beberapa log yang terjadi dalam sebuah sistem. Lokasi dari file log ini tersebar di beberapa server berdasarkan keputusan arsitektur dari vRA pada saat instalasi/deployment, apakah menggunakan mekanisme distributed deployment atau simple … Read more

Permanent Device Loss (PDL) and All-Paths-Down (APD) in vSphere 5.x

Symptoms Permanent Device Loss (PDL) A datastore is shown as unavailable in the Storage view. A storage adapter indicates the Operational State of the device as Lost Communication. All paths to the device are marked as Dead. The /var/log/vmkernel.log file shows messages similar to: cpu2:853571)VMW_SATP_ALUA: satp_alua_issueCommandOnPath:661: Path “vmhba3:C0:T0:L0” (PERM LOSS) command 0xa3 failed with status Device is … Read more