> Also in our favour is that the users of the cluster we are currently
> intending for this have established a practice of storing large objects.
That definitely is in your favor.
> but it remains to be seen how 60x 22TB behaves in practice.
Be sure you don't get SMR drives.
> and it's hard for it to rebalance.
^ This.
> What is OLC?
QLC SSDs store 33% more data than TLC, 4 voltage levels per cell vs 3.
> Fascinating to hear about destroy-redeploy being safer than a simple
> restart-recover!
This was Luminous, that dynamic may be different now, esp. with Nautilus async
recovery.
> Agreed. I guess I wanted to add the data point that these kinds of clusters
> can and do make full sense in certain contexts, and push a little away from
> "friends don't let friends use HDDs" dogma.
Understood. Some deployments aren't squeezed for DC space -- today. But since
many HDD deployments are using LFF chassis, the form factor and interface
limitations down the road still complicate expansion and SSD utilization.
> For now, we limit individual cloud volumes to 300 IOPs, doubled for those who
> need it.
I'm curious how many clients / volumes you have vs. number of HDD OSDs and if
you're using replication or EC. If you have relatively few clients per HDD
that would definitely improve the dynamic.
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