Re: Bad workloads for RAID0?

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to, 2022-02-10 kello 19:12 -0800, Gordon Messmer kirjoitti:
> It *probably* will, but I think there are conditions under which it 
> wouldn't.  One SSD might be able to saturate your controller for
> reads.  
> Interleaved writes will probably improve, but that might depend on
> how 
> many cells are in each SSD, and how the SSD's controller spreads
> writes 
> among them.  If you're looking at QLC drives, it might depend
> somewhat 
> on whether the 1TB drives together have more SLC cells than the 2TB 
> drive has.
> 

Interesting. I'm looking at the Crucial MX500 in either 2x1TB or 1x2TB
configuration. They appear to be "TLC" drives rather than QLC or SLC,
but I would imagine that both configurations would have more or less
the same amount of cells.

> Which is to say that if you haven't actually tested *your workload*
> on 
> it, then there's some risk.  You're probably not going to save much
> on 
> the purchase, you're going to have slightly less reliable storage,
> and 
> there's a small chance that performance won't be much better than a 
> single drive.
> 

I'm not concerned about reliability in this case, and the price is more
of less the same, but if the RAID0 array isn't going to be any faster –
and might even be slower – then I suppose there wouldn't be much point
to it. 


-- 
Terveisin / Regards,
Matti Pulkkinen

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