Bcache accelerated LVM LV device doesn't come up after reboot

Bcache accelerated LVM LV device doesn't come up after reboot

[Alcatraz NG]

Hello,

I am using bcache to accelerate my LVM LVs (lvmcache is not ideal
approach for some reason). But every time I reboot, all bcache devices
just disappear, and doesn't come up until `partprobe` being executed
manually.

Is there any method to let bcache bring those devices up automatically
when the system is up? The `partprobe` workaround isn't ideal as most
applications will fail due to the non-existent device. I have tried to
adjust some module load configurations, but it did not work.

Many thanks

Re: Bcache accelerated LVM LV device doesn't come up after reboot

[Eric Wheeler]

On Mon, 5 Jun 2023, Alcatraz NG wrote:

> Hello,
> 
> I am using bcache to accelerate my LVM LVs (lvmcache is not ideal
> approach for some reason). But every time I reboot, all bcache devices
> just disappear, and doesn't come up until `partprobe` being executed
> manually.

It sounds like the udev rules aren't configured.  Do you have this file 
from the bcache-tools package (the number "69" may differ):
 /usr/lib/udev/rules.d/69-bcache.rules

Depending on your setup you might have to rebuild the initramfs, too (ie 
`dracut` or `update-initramfs` or whatever your distro uses).


--
Eric Wheeler



> 
> Is there any method to let bcache bring those devices up automatically
> when the system is up? The `partprobe` workaround isn't ideal as most
> applications will fail due to the non-existent device. I have tried to
> adjust some module load configurations, but it did not work.
> 
> Many thanks
>