(Slightly abbreviated) Den tors 24 okt. 2019 kl 09:24 skrev Frank Schilder <fr...@dtu.dk>:
> What I learned are the following: > > 1) Avoid this work-around too few hosts for EC rule at all cost. > > 2) Do not use EC 2+1. It does not offer anything interesting for > production. Use 4+2 (or 8+2, 8+3 if you have the hosts). > > 3) If you have no perspective of getting at least 7 servers in the long > run (4+2=6 for EC profile, +1 for fail-over automatic rebuild), do not go > for EC. > > 4) Before you start thinking about replicating to a second site, you > should have a primary site running solid first. > > This is collected from my experience. I would do things different now and > maybe it helps you with deciding how to proceed. Its basically about what > resources can you expect in the foreseeable future and what compromises are > you willing to make with regards to sleep and sanity. > Amen to all of those points. We did similar-but-not-same mistakes on an EC cluster here. You are going to produce more tears than I/O if you make these mis-designs mentioned above. We could add: 5) Never buy SMR drives, pretend they don't even exist. If a similar technology appears tomorrow for cheap SSD/NVME, skip it. -- May the most significant bit of your life be positive.
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