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How does disk access work with instance backed by cinder volume.

Hi, I created a VM using horizon. I picked source as image and I set a volume size of 120GB.

When the VM runs the disk it is visible as /dev/vda and this disk is created on block storage correct?

So when this instance is running on the computer node, if it's a single disk, which part of it is running on the compute and which part is on the block storage? Or in this case it's all running on block storage?

But when reads/writes happen on the VM on the compute node are they not cached locally first and then written to the Cinder block storage?

How does disk access work with instance backed by cinder volume.

Hi, I created a VM using horizon. I picked source as image and I set a volume size of 120GB.

When the VM runs the disk it is visible as /dev/vda and this disk is created on block storage correct?

So when this instance is running on the computer node, if it's a single disk, which part of it is running on the compute and which part is on the block storage? Or in this case it's all running on block storage?

But when reads/writes happen on the VM on the compute node are they not cached locally first and then written to the Cinder block storage?

Update 2018/11/21: Using Cinder with iSCSI on 10 Gigabit

How does disk access work with instance backed by cinder volume.

Hi, I created a VM using horizon. I picked source as image and I set a volume size of 120GB.

When the VM runs the disk it is visible as /dev/vda and this disk is created on block storage correct?

So when this instance is running on the computer node, if it's a single disk, which part of it is running on the compute and which part is on the block storage? Or in this case it's all running on block storage?

But when reads/writes happen on the VM on the compute node are they not cached locally first and then written to the Cinder block storage?

Update 2018/11/21: Using KVM, Cinder with iSCSI on 10 Gigabit