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
