As others have pointed out; setting the failure domain to OSD is dangerous 
because then all 6 chunks for an object can end up on the same host.  6 hosts 
really seems like the minimum to mess with EC pools.

Adding a bucket type between host and osd seems like a good idea here, if you 
absolutely must use EC pools.

Perhaps something that corresponds to the HBAs / disk controllers?

Thank you,

Dominic L. Hilsbos, MBA 
Director - Information Technology 
Perform Air International, Inc.
[email protected] 
www.PerformAir.com



-----Original Message-----
From: Lindsay Mathieson [mailto:[email protected]] 
Sent: Friday, June 26, 2020 4:08 AM
To: Zhenshi Zhou
Cc: ceph-users
Subject: [ceph-users] Re: fault tolerant about erasure code pool

On 26/06/2020 8:08 pm, Zhenshi Zhou wrote:
> Hi Lindsay,
>
> I have only 3 hosts, and is there any method to set a EC pool cluster 
> in a better way

There's failure domain by OSD, which Janne knows far better than I :)

-- 
Lindsay
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