Disk Drive on Virtual Machine (G:) not able to write log, causing application crash

Question

Disk Drive on Virtual Machine (G:) not able to write log, causing application crash

Hugo Fernandez 0

We have a VM running a web application. We write logs to a disk drive and it is causing a crash because it cannot write to it.

There is plenty of disk space in the disk drive and we see no other error logs anywhere.

Please help! we don't know what to do!

Nikhil Duserla 8,185 Reputation points Microsoft External Staff Moderator

2025-03-14T04:48:57.07+00:00

Hi @Hugo Fernandez ,

I understand that you are facing issues while writing logs to the disk drive.

Make sure that no disk quotas are applied to the disk, as they could restrict the amount of space the application can use, even if there is available disk space. also check that you have permissions to write logs to the (G) drive.

moreover, check the disk health that may prevents writing logs to the disk.

Please let us know if you have any further queries.

Thank you.
kobulloc-MSFT 26,811 Reputation points Microsoft Employee Moderator

2025-03-17T22:16:46.6933333+00:00

Hello, @Hugo Fernandez !

I understand that you have a web application on a VM, but I'm not clear if the VM is crashing or if the web application is crashing.

If the VM is crashing, we'll need to troubleshoot the VM:
https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/understand-vm-reboot

If the web application is crashing because it cannot write logs to the VM's attached data disk, then we'll need to figure out why the web application cannot write logs (mostly likely starting with VM size, OS, configuration of attached data disk, and the number/frequency of logs that are being written by the web application) to see if this is hardware related issue like IOPS performance or a permissions issue which could be at the OS level.

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Nikhil Duserla 8,185 Reputation points Microsoft External Staff Moderator

2025-03-14T04:48:57.07+00:00

Hi @Hugo Fernandez ,

I understand that you are facing issues while writing logs to the disk drive.

Make sure that no disk quotas are applied to the disk, as they could restrict the amount of space the application can use, even if there is available disk space. also check that you have permissions to write logs to the (G) drive.

moreover, check the disk health that may prevents writing logs to the disk.

Please let us know if you have any further queries.

Thank you.
kobulloc-MSFT 26,811 Reputation points Microsoft Employee Moderator

2025-03-17T22:16:46.6933333+00:00

Hello, @Hugo Fernandez !

I understand that you have a web application on a VM, but I'm not clear if the VM is crashing or if the web application is crashing.

If the VM is crashing, we'll need to troubleshoot the VM:
https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/understand-vm-reboot

If the web application is crashing because it cannot write logs to the VM's attached data disk, then we'll need to figure out why the web application cannot write logs (mostly likely starting with VM size, OS, configuration of attached data disk, and the number/frequency of logs that are being written by the web application) to see if this is hardware related issue like IOPS performance or a permissions issue which could be at the OS level.

Answer 1

Hello, @Hugo Fernandez! We haven't heard back from you so hopefully everything is going well. If you still need assistance, please let us know in the comments and we'll be happy to help you.Why am I experiencing a crash when writing logs to my VM?

There are a variety of possible causes for VM crashes but when this seems to occur while writing logs to an attached drive, you may want to start by looking at the minute metrics for the storage account as spikes in IOPS may be resulting in a throttling error:

https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/unexpected-reboots-attached-vhds

Generally speaking with crashes and unexpected reboots, you'll want to check the following:

https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/unexpected-vm-reboot-root-cause-analysis

Check resource health on the VM in the Azure Portal
Run diagnostics on the VM

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Disk Drive on Virtual Machine (G:) not able to write log, causing application crash

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