Re: Multi-Actuator SAS HDD First Look

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On 03/30/2018 03:07 PM, Tim Walker wrote:
> Hi Doug-
> 
> Currently, the dual actuator firmware safely spins the drive down if
> either LUN receives the START STOP UNIT command.  In other words, if
> LUN1 receives the command, it will flush any dirty data from LUN1l and
> LUN0, then spin down, taking both LUN1 & LUN0 off line. Alternatively,
> we've had input that either:
> a) Both LUNs must receive the START STOP UNIT command before the drive
> will spin down, OR
> b) Move the storage to LUN1 & LUN2, keeping LUN0 (with no storage) for
> device specific commands such as START STOP UNIT that do not directly
> access the media.
> 
That will get interesting when suspending the device; physical
interactions between independent LUNs are always tricky. And I don't
even want to imagine the implications when assigning each LUN to
individual VM guests; shutting down one VM will also interfere with the
other VM ... shudder.

Actually I would propose to have a 'management' LUN at LUN0, who could
handle all the device-wide commands (eg things like START STOP UNIT,
firmware update, or even SMART commands), and ignoring them for the
remaining LUNs.

I guess that would make the whole setup easier to handle.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@xxxxxxx			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)



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