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-'\" t
-.\"     Title: nvme-wdc-smart-add-log
-.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
-.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
-.\"      Date: 01/08/2019
-.\"    Manual: NVMe Manual
-.\"    Source: NVMe
-.\"  Language: English
-.\"
-.TH "NVME\-WDC\-SMART\-AD" "1" "01/08/2019" "NVMe" "NVMe Manual"
-.\" -----------------------------------------------------------------
-.\" * Define some portability stuff
-.\" -----------------------------------------------------------------
-.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-.\" http://bugs.debian.org/507673
-.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
-.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-.ie \n(.g .ds Aq \(aq
-.el       .ds Aq '
-.\" -----------------------------------------------------------------
-.\" * set default formatting
-.\" -----------------------------------------------------------------
-.\" disable hyphenation
-.nh
-.\" disable justification (adjust text to left margin only)
-.ad l
-.\" -----------------------------------------------------------------
-.\" * MAIN CONTENT STARTS HERE *
-.\" -----------------------------------------------------------------
-.SH "NAME"
-nvme-wdc-smart-add-log \- Send NVMe WDC smart\-add\-log Vendor Unique Command, return result
-.SH "SYNOPSIS"
-.sp
-.nf
-\fInvme wdc smart\-add\-log\fR <device> [\-\-interval=<NUM>, \-i <NUM>] [\-\-output\-format=<normal|json> \-o <normal|json>]
-.fi
-.SH "DESCRIPTION"
-.sp
-For the NVMe device given, send a Vendor Unique WDC smart\-add\-log command and provide the additional smart log\&. The \-\-interval option will return performance statistics from the specified reporting interval\&.
-.sp
-The <device> parameter is mandatory and may be either the NVMe character device (ex: /dev/nvme0)\&.
-.sp
-This will only work on WDC devices supporting this feature\&. Results for any other device are undefined\&.
-.sp
-On success it returns 0, error code otherwise\&.
-.SH "OPTIONS"
-.PP
-\-i <NUM>, \-\-interval=<NUM>
-.RS 4
-Return the statistics from specific interval, defaults to 14
-.RE
-.PP
-\-o <format>, \-\-output\-format=<format>
-.RS 4
-Set the reporting format to
-\fInormal\fR, or
-\fIjson\fR\&. Only one output format can be used at a time\&. Default is normal\&.
-.RE
-.sp
-Valid Interval values and description :\-
-.TS
-allbox tab(:);
-ltB ltB.
-T{
-Value
-T}:T{
-Description
-T}
-.T&
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt.
-T{
-.sp
-\fB1\fR
-T}:T{
-.sp
-Most recent five (5) minute accumulated set\&.
-T}
-T{
-.sp
-\fB2\-12\fR
-T}:T{
-.sp
-Previous five (5) minute accumulated sets\&.
-T}
-T{
-.sp
-\fB13\fR
-T}:T{
-.sp
-The accumulated total of sets 1 through 12 that contain the previous hour of accumulated statistics\&.
-T}
-T{
-.sp
-\fB14\fR
-T}:T{
-.sp
-The statistical set accumulated since power\-up\&.
-T}
-T{
-.sp
-\fB15\fR
-T}:T{
-.sp
-The statistical set accumulated during the entire lifetime of the device\&.
-T}
-.TE
-.sp 1
-.SH "CA LOG PAGE DATA OUTPUT EXPLANATION"
-.TS
-allbox tab(:);
-ltB ltB.
-T{
-Field
-T}:T{
-Description
-T}
-.T&
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt.
-T{
-.sp
-\fBPhysical NAND bytes written\&.\fR
-T}:T{
-.sp
-The number of bytes written to NAND\&. 16 bytes \- hi/lo
-T}
-T{
-.sp
-\fBPhysical NAND bytes read\fR
-T}:T{
-.sp
-The number of bytes read from NAND\&. 16 bytes \- hi/lo
-T}
-T{
-.sp
-\fBBad NAND Block Count\fR
-T}:T{
-.sp
-Raw and normalized count of the number of NAND blocks that have been retired after the drives manufacturing tests (i\&.e\&. grown back blocks)\&. 2 bytes normalized, 6 bytes raw count
-T}
-T{
-.sp
-\fBUncorrectable Read Error Count\fR
-T}:T{
-.sp
-Total count of NAND reads that were not correctable by read retries, all levels of ECC, or XOR (as applicable)\&. 8 bytes
-T}
-T{
-.sp
-\fBSoft ECC Error Count\fR
-T}:T{
-.sp
-Total count of NAND reads that were not correctable by read retries, or first\-level ECC\&. 8 bytes
-T}
-T{
-.sp
-\fBSSD End to End Detection Count\fR
-T}:T{
-.sp
-A count of the detected errors by the SSD end to end error correction which includes DRAM, SRAM, or other storage element ECC/CRC protection mechanism (not NAND ECC)\&. 4 bytes
-T}
-T{
-.sp
-\fBSSD End to End Correction Count\fR
-T}:T{
-.sp
-A count of the corrected errors by the SSD end to end error correction which includes DRAM, SRAM, or other storage element ECC/CRC protection mechanism (not NAND ECC)\&. 4 bytes
-T}
-T{
-.sp
-\fBSystem Data % Used\fR
-T}:T{
-.sp
-A normalized cumulative count of the number of erase cycles per block since leaving the factory for the system (FW and metadata) area\&. Starts at 0 and increments\&. 100 indicates that the estimated endurance has been consumed\&.
-T}
-T{
-.sp
-\fBUser Data Max Erase Count\fR
-T}:T{
-.sp
-The maximum erase count across all NAND blocks in the drive\&. 4 bytes
-T}
-T{
-.sp
-\fBUser Data Min Erase Count\fR
-T}:T{
-.sp
-The minimum erase count across all NAND blocks in the drive\&. 4 bytes
-T}
-T{
-.sp
-\fBRefresh Count\fR
-T}:T{
-.sp
-A count of the number of blocks that have been re\-allocated due to background operations only\&. 8 bytes
-T}
-T{
-.sp
-\fBProgram Fail Count\fR
-T}:T{
-.sp
-Raw and normalized count of total program failures\&. Normalized count starts at 100 and shows the percent of remaining allowable failures\&. 2 bytes normalized, 6 bytes raw count
-T}
-T{
-.sp
-\fBUser Data Erase Fail Count\fR
-T}:T{
-.sp
-Raw and normalized count of total erase failures in the user area\&. Normalized count starts at 100 and shows the percent of remaining allowable failures\&. 2 bytes normalized, 6 bytes raw count
-T}
-T{
-.sp
-\fBSystem Area Erase Fail Count\fR
-T}:T{
-.sp
-Raw and normalized count of total erase failures in the system area\&. Normalized count starts at 100 and shows the percent of remaining allowable failures\&. 2 bytes normalized, 6 bytes raw count
-T}
-T{
-.sp
-\fBThermal Throttling Status\fR
-T}:T{
-.sp
-The current status of thermal throttling (enabled or disabled)\&. 2 bytes
-T}
-T{
-.sp
-\fBThermal Throttling Count\fR
-T}:T{
-.sp
-A count of the number of thermal throttling events\&. 2 bytes
-T}
-T{
-.sp
-\fBPCIe Correctable Error Count\fR
-T}:T{
-.sp
-Summation counter of all PCIe correctable errors (Bad TLP, Bad DLLP, Receiver error, Replay timeouts, Replay rollovers)\&. 8 bytes
-T}
-.TE
-.sp 1
-.SH "C1 LOG PAGE DATA OUTPUT EXPLANATION"
-.TS
-allbox tab(:);
-ltB ltB.
-T{
-Field
-T}:T{
-Description
-T}
-.T&
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt
-lt lt.
-T{
-.sp
-\fBHost Read Commands\fR
-T}:T{
-.sp
-Number of host read commands received during the reporting period\&.
-T}
-T{
-.sp
-\fBHost Read Blocks\fR
-T}:T{
-.sp
-Number of 512\-byte blocks requested during the reporting period\&.
-T}
-T{
-.sp
-\fBAverage Read Size\fR
-T}:T{
-.sp
-Average Read size is calculated using (Host Read Blocks/Host Read Commands)\&.
-T}
-T{
-.sp
-\fBHost Read Cache Hit Commands\fR
-T}:T{
-.sp
-Number of host read commands that serviced entirely from the on\-board read cache during the reporting period\&. No access to the NAND flash memory was required\&. This count is only updated if the entire command was serviced from the cache memory\&.
-T}
-T{
-.sp
-\fBHost Read Cache Hit Percentage\fR
-T}:T{
-.sp
-Percentage of host read commands satisfied from the cache\&.
-T}
-T{
-.sp
-\fBHost Read Cache Hit Blocks\fR
-T}:T{
-.sp
-Number of 512\-byte blocks of data that have been returned for Host Read Cache Hit Commands during the reporting period\&. This count is only updated with the blocks returned for host read commands that were serviced entirely from cache memory\&.
-T}
-T{
-.sp
-\fBAverage Read Cache Hit Size\fR
-T}:T{
-.sp
-Average size of read commands satisfied from the cache\&.
-T}
-T{
-.sp
-\fBHost Read Commands Stalled\fR
-T}:T{
-.sp
-Number of host read commands that were stalled due to a lack of resources within the SSD during the reporting period (NAND flash command queue full, low cache page count, cache page contention, etc\&.)\&. Commands are not considered stalled if the only reason for the delay was waiting for the data to be physically read from the NAND flash\&. It is normal to expect this count to equal zero on heavily utilized systems\&.
-T}
-T{
-.sp
-\fBHost Read Commands Stalled Percentage\fR
-T}:T{
-.sp
-Percentage of read commands that were stalled\&. If the figure is consistently high, then consideration should be given to spreading the data across multiple SSDs\&.
-T}
-T{
-.sp
-\fBHost Write Commands\fR
-T}:T{
-.sp
-Number of host write commands received during the reporting period\&.
-T}
-T{
-.sp
-\fBHost Write Blocks\fR
-T}:T{
-.sp
-Number of 512\-byte blocks written during the reporting period\&.
-T}
-T{
-.sp
-\fBAverage Write Size\fR
-T}:T{
-.sp
-Average Write size calculated using (Host Write Blocks/Host Write Commands)\&.
-T}
-T{
-.sp
-\fBHost Write Odd Start Commands\fR
-T}:T{
-.sp
-Number of host write commands that started on a non\-aligned boundary during the reporting period\&. The size of the boundary alignment is normally 4K; therefore this returns the number of commands that started on a non\-4K aligned boundary\&. The SSD requires slightly more time to process non\-aligned write commands than it does to process aligned write commands\&.
-T}
-T{
-.sp
-\fBHost Write Odd Start Commands Percentage\fR
-T}:T{
-.sp
-Percentage of host write commands that started on a non\-aligned boundary\&. If this figure is equal to or near 100%, and the NAND Read Before Write value is also high, then the user should investigate the possibility of offsetting the file system\&. For Microsoft Windows systems, the user can use Diskpart\&. For Unix\-based operating systems, there is normally a method whereby file system partitions can be placed where required\&.
-T}
-T{
-.sp
-\fBHost Write Odd End Commands\fR
-T}:T{
-.sp
-Number of host write commands that ended on a non\-aligned boundary during the reporting period\&. The size of the boundary alignment is normally 4K; therefore this returns the number of commands that ended on a non\-4K aligned boundary\&.
-T}
-T{
-.sp
-\fBHost Write Odd End Commands Percentage\fR
-T}:T{
-.sp
-Percentage of host write commands that ended on a non\-aligned boundary\&.
-T}
-T{
-.sp
-\fBHost Write Commands Stalled\fR
-T}:T{
-.sp
-Number of host write commands that were stalled due to a lack of resources within the SSD during the reporting period\&. The most likely cause is that the write data was being received faster than it could be saved to the NAND flash memory\&. If there was a large volume of read commands being processed simultaneously, then other causes might include the NAND flash command queue being full, low cache page count, or cache page contention, etc\&. It is normal to expect this count to be non\-zero on heavily utilized systems\&.
-T}
-T{
-.sp
-\fBHost Write Commands Stalled Percentage\fR
-T}:T{
-.sp
-Percentage of write commands that were stalled\&. If the figure is consistently high, then consideration should be given to spreading the data across multiple SSDs\&.
-T}
-T{
-.sp
-\fBNAND Read Commands\fR
-T}:T{
-.sp
-Number of read commands issued to the NAND devices during the reporting period\&. This figure will normally be much higher than the host read commands figure, as the data needed to satisfy a single host read command may be spread across several NAND flash devices\&.
-T}
-T{
-.sp
-\fBNAND Read Blocks\fR
-T}:T{
-.sp
-Number of 512\-byte blocks requested from NAND flash devices during the reporting period\&. This figure would normally be about the same as the host read blocks figure
-T}
-T{
-.sp
-\fBAverage NAND Read Size\fR
-T}:T{
-.sp
-Average size of NAND read commands\&.
-T}
-T{
-.sp
-\fBNAND Write Commands\fR
-T}:T{
-.sp
-Number of write commands issued to the NAND devices during the reporting period\&. There is no real correlation between the number of host write commands issued and the number of NAND Write Commands\&.
-T}
-T{
-.sp
-\fBNAND Write Blocks\fR
-T}:T{
-.sp
-Number of 512\-byte blocks written to the NAND flash devices during the reporting period\&. This figure would normally be about the same as the host write blocks figure\&.
-T}
-T{
-.sp
-\fBAverage NAND Write Size\fR
-T}:T{
-.sp
-Average size of NAND write commands\&. This figure should never be greater than 128K, as this is the maximum size write that is ever issued to a NAND device\&.
-T}
-T{
-.sp
-\fBNAND Read Before Write\fR
-T}:T{
-.sp
-This is the number of read before write operations that were required to process non\-aligned host write commands during the reporting period\&. See Host Write Odd Start Commands and Host Write Odd End Commands\&. NAND Read Before Write operations have a detrimental effect on the overall performance of the device\&.
-T}
-.TE
-.sp 1
-.SH "EXAMPLES"
-.sp
-.RS 4
-.ie n \{\
-\h'-04'\(bu\h'+03'\c
-.\}
-.el \{\
-.sp -1
-.IP \(bu 2.3
-.\}
-Has the program issue WDC smart\-add\-log Vendor Unique Command with default interval (14) :
-.sp
-.if n \{\
-.RS 4
-.\}
-.nf
-# nvme wdc smart\-add\-log /dev/nvme0
-.fi
-.if n \{\
-.RE
-.\}
-.RE
-.SH "NVME"
-.sp
-Part of the nvme\-user suite\&.