Hyper-V Ubuntu 10.04, Filesystem suddenly becomes Read-Only?

Posted by Daniel Upton on Server Fault See other posts from Server Fault or by Daniel Upton
Published on 2012-03-09T10:12:46Z Indexed on 2012/04/03 17:33 UTC
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Filed under:

ubuntu

|

hyper-v

|

read-only

We are running a Ubuntu 10.04 VM on a Hyper-V system,
The VM is dedicated to running one of our web applications.

We have enabled the Hyper-V drivers in /etc/initramfs-tools/modules like so:

hv_vmbus
hv_storvsc
hv_blkvsc
hv_netvsc

And updated the kernel image like so:

$ update-initramfs -u

And all was good... until..

This morning i got a support request that our web application was throwing an error 500, so i checked the logs and nothing was there.

Then I remembered that I had seen this on another of our ubuntu servers so I...

$ touch foo.txt

And my suspicions were confirmed:

touch:  cannot touch `foo.txt':  Read-only file system

Why is the filesystem randomly becoming readonly?

Is this only in Ubuntu on HV? Is it a problem on RedHat or Cent?

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