How to hold I/O requests in linux.

[pooja_kanchan]

Hi,
I need to quiesce a VM manually and for that I need to somehow pause VM and hold incoming I/O requests. Any help will be appreciated.

Thanks in advance,
Pooja

[Rubberman]

Well, you should be able to suspend or hibernate the OS running in the VM. Some virtual machine managers have the ability to pause a running VM as well. What VM manager are you using?

[pooja_kanchan]

Thanks for the reply.I am using Vmware- tool to manage VMs. I know only little about VM manager. Can you please tell me which virtual machine manger can hold I/O requests? I need to write OS independent code as far as possible. I found vmsync module which comes with vmware tool capable of freezing file system, but facing some issues with it.

Thanks and regards,
Pooja.

[Rubberman]

VirtualBox has the ability to pause a VM. It's not just stopping I/O per se, but placing the entire VM on hold. Sort of a suspend/resume capability.