a question about how to use the module

[785336111]

I want to know how to create a raizn device using dmsetup. Can you show a simple example of creating a mapping table?

[Thomas-Kim]

Hi, just want to preface this by saying this release of RAIZN is not intended for real use, and I don't recommend running it outside of a virtual machine.

The raizn table args are:
chunk size (KiB), num IO workers, unused (1), unused (0), device, device, ...

Example
echo "0 83886080 raizn 64 1 1 0 /dev/nvme0n1 /dev/nvme1n1 /dev/nvme2n1 /dev/nvme3n1" | sudo dmsetup create
raizn0

[785336111]

Thank you for your reply. I just use raizn to complete my graduation project.
And can you show me your fio configuration files for writing? I don't know why the system crash when I use fio to write into raizn device.For example,the command in the picture below can cause crash.

[Thomas-Kim]

Could I get some more details about your system environment etc.?

RAIZN is not particularly stable, so there are a number of things that could be going wrong.

[785336111]

My experiments were run on a server with a 4*36core CPU，1TB of DRAM. And I use femu(modified to support proper latency emulation) to simulate 5 SSDs，whose configuration is as followed:

What's more，my os is as followed:

[Thomas-Kim]

Sorry for the delay.

It's difficult for me to say, but here are a couple things that come to mind:

1. You shouldn't need to specify -zonesize when -zonemode=zbd on sufficiently recent versions of fio
2. I have never tested RAIZN with femu devices, that could be the issue
3. Does this predictably crash if you reboot -> setup -> run benchmark?