From mboxrd@z Thu Jan 1 00:00:00 1970 From: martin.petersen@oracle.com (Martin K. Petersen) Date: Thu, 13 Jun 2019 19:57:59 -0400 Subject: [PATCH v2 3/3] nvme: Set physical block size and optimal I/O size according to NVMe 1.4 In-Reply-To: (Bart Van Assche's message of "Thu, 13 Jun 2019 10:57:18 -0700 (PDT)") References: <20190610210612.103952-1-bvanassche@acm.org> <20190610210612.103952-4-bvanassche@acm.org> Message-ID: Bart, > Namespace Atomic Write Unit Power Fail (NAWUPF): This field indicates > the namespace specific size of the write operation guaranteed to be > written atomically to the NVM during a power fail or error condition. > A value of 0h indicates that the size for this namespace is the same > size as that reported in the AWUPF field of the Identify Controller data > structure. All other values specify a size in terms of logical blocks > using the same encoding as the AWUPF field. There's some ambiguity there. But I think you're right that the encoding statement qualifies it. This means that there is no explicit way of expressing a NAWUPF of 1 logical block but that is OK since it is implied. -- Martin K. Petersen Oracle Linux Engineering