> I'm afraid nobody will build a 100PB cluster with 1T drives. That's just 
> absurd

Check the archives for the panoply of absurdity that I’ve encountered ;)

> So, the sharp increase of per-device capacity has to be taken into account. 
> Specifically as the same development is happening with SSDs. There is no way 
> around 100TB drives in the near future and a system like ceph is either able 
> to handle that or will die

Agreed.  I expect 122TB QLC in 1H2025.  With NVMe and PCI-e Gen 5 one might 
experiment with slicing each into two OSDs.  But for archival and object 
workloads latency usually isn’t so big a deal, so we may increasingly see a 
strategy adapted to the workloads.

> 10 higher aggregated sustained IOP/s performance compared with a similarly 
> sized ceph cluster 
> 
But not, I suspect, nearly as many tentacles.




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