> 
> One thing that popped up in my mind, if I do this, the reamining unused space,
> e.g., /dev/sdX2 in both disks, will be *partitions*, and not *disks*. Does 
> Ceph
> have a problem with using partitions for OSDs?

Nope, that should be fine.  In fact back in the Filestore days you generally 
had two partitions.

> 
> 
>> I think you’d not have a good experience, see my compromise suggestion above.
>> Remind me how many chassis total?  As a certain chassis count, the importance
>> of mirrored boot (and network bonding) diminishes.
> 
> We have 13x chassis. I am already convinced to not have OSDs on VDs :-)

Having been there, I like to help others avoid the torment ;)

> 
> 
>> Does it show that the BBU is a supercap vs a battery?
> 
> It looks like supercap:

Groovy.  Those are usually rated for at least 3 years.  

There's a handy script here 

https://github.com/prometheus-community/node-exporter-textfile-collector-scripts


for getting StorCLI info into Prometheus.  If you have a fleet prom you might 
add that to your node_exporter deployment.  It should be possible to give the 
bundled Ceph-managed node_exporter additional config to pick this up, but I 
haven't done that myself.

> 
> Cachevault_Info :
> ===============
> 
> --------------------
> Property    Value
> --------------------
> Type        CVPM05
> Temperature 24 C
> State       Optimal
> --------------------
> 
> ...
> 
> GasGaugeStatus :
> ==============
> 
> ------------------------------
> Property                Value
> ------------------------------
> Pack Energy             136 J
> Capacitance             100 %
> Remaining Reserve Space 0
> ------------------------------
> 
> 
>> When I see RAID HBAs I either just set passthrough and ignore the RoC
> 
> I think I'll do just that and just use MD for the small RAID volume for the 
> OS.

Given your constraints, I think that's the best strategy.  The only thing that 
MD for the OS won't give you is automatically handling the loss of the first 
boot drive across a power cycle, but I personally haven't found that to be 
critical.


> 
> Thank you,
> Gustavo

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