With k=2 and m=1 you cannot do any maintenance with redundancy. Any fail requires
immediate attention. Its a recipe for data loss. There have been lengthy discussions about
why, in production, min_size>=k+1 is recommended and why min_size=k is not.
For any k, with m=1 you either have service outage on any maintenance event
(min_size>=k+1), or risk data loss for fresh writes to non-redundant storage
(min_size=k).
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
________________________________________
From: Vitaliy Filippov <vitalif(a)yourcmc.ru>
Sent: 14 February 2020 00:10:03
To: Anthony Brandelli (abrandel); Martin Verges
Cc: ceph-users(a)ceph.io
Subject: [ceph-users] Re: EC Pools w/ RBD - IOPs
please do not even think about using an EC pool (k=2,
m=1). See other
posts here, just don't.
Why not?
--
With best regards,
Vitaliy Filippov
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