Re: Debugging SCSI 'UNMAP' ("Logical Block Provisioning") failure on an SSD

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On Thu, Mar 15, 2018 at 08:45:05AM -0400, Martin K. Petersen wrote:
> 
> Kashyap,
> 
> > /me naively wonders if it has anything to do with accessing it via
> > Linux.
> 
> I'm guessing that the drive doesn't actually support SCSI UNMAP. I have
> a T3 that reports all the right things in the bl/lbpv VPD pages but also
> has lbpme set to 0.
> 
> Interestingly enough, my T3 does appear to be a regular SATA drive
> behind a USB bridge. 

I see.  So I ran `hdparm` on my SSD (still attached via the
'Thunderbolt' port), and it does show TRIM support:

    $> hdparm -I /dev/sdc | grep TRIM
               *    Data Set Management TRIM supported (limit 8 blocks)

(Full output attached to this e-mail as a text file.)

> Have you tried to issue a DSM TRIM command via ATA
> passthrough?

I'm afraid I don't know how to do that (my SCSI / (S)ATA knowledge is
less than zero).  If there's a page where I can educate myself about how
to send the TRIM command via ATA passthrough I'd appreciate it.  (Aside:
>From my looking up, I don't see any ATA equivalent of SCSI's
'sg3_utils'; wonder if there is any.)

Thanks for the response.

-- 
/kashyap
$> hdparm -I /dev/sdc
/dev/sdc:

ATA device, with non-removable media
	Model Number:       Samsung Portable SSD T5                 
	Serial Number:      S3UNNV0K102165T     
	Firmware Revision:  MVT41P1Q
	Transport:          Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
Standards:
	Used: unknown (minor revision code 0x0039) 
	Supported: 9 8 7 6 5 
	Likely used: 9
Configuration:
	Logical		max	current
	cylinders	16383	16383
	heads		16	16
	sectors/track	63	63
	--
	CHS current addressable sectors:    16514064
	LBA    user addressable sectors:   268435455
	LBA48  user addressable sectors:   976773168
	Logical  Sector size:                   512 bytes
	Physical Sector size:                   512 bytes
	Logical Sector-0 offset:                  0 bytes
	device size with M = 1024*1024:      476940 MBytes
	device size with M = 1000*1000:      500107 MBytes (500 GB)
	cache/buffer size  = unknown
	Form Factor: unknown (0x0006]
	Nominal Media Rotation Rate: Solid State Device
Capabilities:
	LBA, IORDY(can be disabled)
	Queue depth: 32
	Standby timer values: spec'd by Standard, no device specific minimum
	R/W multiple sector transfer: Max = 1	Current = 1
	DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6 
	     Cycle time: min=120ns recommended=120ns
	PIO: pio0 pio1 pio2 pio3 pio4 
	     Cycle time: no flow control=120ns  IORDY flow control=120ns
Commands/features:
	Enabled	Supported:
	   *	SMART feature set
	   *	Power Management feature set
	   *	Write cache
	   *	Look-ahead
	   *	WRITE_BUFFER command
	   *	READ_BUFFER command
	   *	NOP cmd
	   *	DOWNLOAD_MICROCODE
	    	SET_MAX security extension
	   *	48-bit Address feature set
	   *	Mandatory FLUSH_CACHE
	   *	FLUSH_CACHE_EXT
	   *	SMART error logging
	   *	SMART self-test
	   *	General Purpose Logging feature set
	   *	WRITE_{DMA|MULTIPLE}_FUA_EXT
	   *	64-bit World wide name
	    	Write-Read-Verify feature set
	   *	WRITE_UNCORRECTABLE_EXT command
	   *	{READ,WRITE}_DMA_EXT_GPL commands
	   *	Segmented DOWNLOAD_MICROCODE
	   *	Gen1 signaling speed (1.5Gb/s)
	   *	Gen2 signaling speed (3.0Gb/s)
	   *	Gen3 signaling speed (6.0Gb/s)
	   *	Native Command Queueing (NCQ)
	   *	Phy event counters
	   *	READ_LOG_DMA_EXT equivalent to READ_LOG_EXT
	    	DMA Setup Auto-Activate optimization
	   *	Device-initiated interface power management
	   *	Software settings preservation
	   *	reserved 69[4]
	   *	DOWNLOAD MICROCODE DMA command
	   *	SET MAX SETPASSWORD/UNLOCK DMA commands
	   *	WRITE BUFFER DMA command
	   *	READ BUFFER DMA command
	   *	Data Set Management TRIM supported (limit 8 blocks)
Logical Unit WWN Device Identifier: 5002538d00000000
	NAA		: 5
	IEEE OUI	: 002538
	Unique ID	: d00000000
Checksum: correct

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