troubleshooting

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

IT-Cloud, IT-Reference, IT-Tutorial / By

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

IT-Tutorial / By

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)

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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

IT-Cloud, IT-Tutorial / By

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

IT-Cloud, IT-Reference / By

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