On 06/24/2011 09:48 PM, Dan Williams wrote:
From: Jeff Skirvin<jeffrey.d.skirvin@xxxxxxxxx>
When resetting a sata device in the domain we have seen occasions where
libsas prematurely marks a device gone in the time it takes for the
device to re-establish the link. This plays badly with software raid
arrays. Other libsas drivers have non-uniform delays in their reset
handlers to try to cover this condition, but not sufficient to close the
hole. Given that a sata device can take many seconds to recover we
filter bcns and poll for the device reattach state before notifying
libsas that the port needs the domain to be rediscovered. Once this has
been proven out at the lldd level we can think about uplevelling this
feature to a common implementation in libsas.
That's the second time something like this have come up now.
Wouldn't it makes sense to implement something like the dev_loss_tmo
mechanism with have for FC? That should cover this situation nicely ...
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
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SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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