Okay it seems like we don't really have a definitive answer on whether it's OK 
to use a RAID controller or not and in what capacity.

Passthrough meaning:

Are you saying that it's OK to use a raid controller where the disks are in 
non-RAID mode?
Are you saying that it's OK to use a raid controller where each disk is in its 
own RAID-0 volume?

I'm just trying to clarify a little bit. You can imagine that nobody wants to 
be that user that does this against the documentation's guidelines and then 
something goes terribly wrong.

Thanks again,
-Drew


-----Original Message-----
From: Anthony D'Atri <a...@dreamsnake.net> 
Sent: Thursday, July 11, 2024 7:24 PM
To: Drew Weaver <drew.wea...@thenap.com>
Cc: John Jasen <jja...@gmail.com>; ceph-users@ceph.io
Subject: Re: [ceph-users] Repurposing some Dell R750s for Ceph



> 
> Isn’t the supported/recommended configuration to use an HBA if you have to 
> but never use a RAID controller?

That may be something I added to the docs.  My contempt for RAID HBAs knows no 
bounds ;)

Ceph doesn’t care.  Passthrough should work fine, I’ve done that for tends of 
thousands of OSDs, albeit on different LSI HBA SKUs.

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