[PATCH v2 06/14] nvme: Rapid Path Failure Recovery read controller identify fields

Randy Jennings randyj at purestorage.com
Tue Feb 10 17:56:38 PST 2026


On Fri, Jan 30, 2026 at 2:36 PM Mohamed Khalfella
<mkhalfella at purestorage.com> wrote:
>
> TP8028 Rapid path failure added new fileds to controller identify
> response. Read CIU (Controller Instance Uniquifier), CIRN (Controller
> Instance Random Number), and CCRL (Cross-Controller Reset Limit) from
> controller identify response. Expose CIU and CIRN as sysfs attributes
> so the values can be used directrly by user if needed.
>
> TP4129 KATO Corrections and Clarifications defined CQT (Command Quiesce
> Time) which is used along with KATO (Keep Alive Timeout) to set an upper
> limit for attempting Cross-Controller Recovery.
>
> Signed-off-by: Mohamed Khalfella <mkhalfella at purestorage.com>
Reviewed-by: Randy Jennings <randyj at purestorage.com>



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