Are redfish event logs persistent across reboot?

[Bills, Jason M]

On 6/16/2021 9:22 PM, Udupa.Ashwini ISV wrote:
> Hi,
> 
> Are redfish event logs(/var/log/redfish) persistent across reboot?
This depends on how your filesystem is mounted.

We used to directly mount /var to our non-volatile flash partitions but 
because of another feature requirement we now mount /var as an overlay 
on /tmp:
https://github.com/Intel-BMC/openbmc/blob/intel/meta-openbmc-mods/meta-common/recipes-phosphor/preinit-mounts/preinit-mounts/init#L76

Then we have another service that periodically rsyncs the /tmp overlay 
into the non-volatile flash partition to persist the redfish logs:
https://github.com/Intel-BMC/openbmc/blob/intel/meta-openbmc-mods/meta-common/recipes-core/nv-sync/nv-sync/nv-syncd
> 
> Currently, I see that old logs are lost after reboot and 
> /var/log/redfish is newly written.
> 
> Is this the current design?
> 
> Regards,
> 
> Ashwini
>