Re: [LSF/MM/BPF TOPIC] Multi-actuator HDDs

Dave Chinner
2020-02-10T21:52:27Z

On Mon, Feb 10, 2020 at 12:01:13PM -0600, Muhammad Ahmad wrote:
> Background:
> As the capacity of HDDs increases so is the need to increase
> performance to efficiently utilize this increase in capacity. The
> current school of thought is to use Multi-Actuators to increase
> spinning disk performance. Seagate has already announced it’s SAS
> Dual-Lun, Dual-Actuator device. [1]
>
> Discussion Proposal:
> What impacts multi-actuator HDDs has on the linux storage stack?
>
> A discussion on the pros & cons of accessing the actuators through a
> single combined LUN or multiple individual LUNs? In the single LUN
> scenario, how should the device communicate it’s LBA to actuator
> mapping? In the case of multi-lun, how should we manage commands that
> affect both actuators?

What ground does this cover that wasn't discussed a couple of years
ago at LSFMM?

https://lwn.net/Articles/753652/

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com