Hi,
I have got 2 different submodels of the SSD Samsung 850 Evo 500 GB.
The first one has DPOFUA=0, the second one has DPOFUA=1 (see below).
That with DPOFUA=0 works fine, but the other with DPOFUA=1 doesn't work
after mounting; it reports errors and switches to read-only mount.
It seems Linux has a problem with DPOFUA=1, so then IMO best would be to
disable that feature of the device. So, how & where can DPOFUA be set to value 0 ?
Thx
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# uname -a
Linux panther 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt20-1+deb8u1 (2015-12-14)
x86_64 GNU/Linux
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Dec 26 00:45:38 panther vmunix: [ 2337.193164] usb 4-1: new SuperSpeed USB
device number 2 using xhci_hcd
Dec 26 00:45:38 panther vmunix: [ 2337.212852] usb 4-1: New USB device found,
idVendor=357d, idProduct=7788
Dec 26 00:45:38 panther vmunix: [ 2337.212861] usb 4-1: New USB device
strings: Mfr=1, Product=2, SerialNumber=3
Dec 26 00:45:38 panther vmunix: [ 2337.212866] usb 4-1: Product: USB to
ATA/ATAPI Bridge
Dec 26 00:45:38 panther vmunix: [ 2337.212870] usb 4-1: Manufacturer: JMicron
Dec 26 00:45:38 panther vmunix: [ 2337.212874] usb 4-1: SerialNumber:
321AE8171482926
Dec 26 00:45:38 panther vmunix: [ 2337.245338] usb-storage 4-1:1.0: USB Mass
Storage device detected
Dec 26 00:45:38 panther vmunix: [ 2337.245591] scsi2 : usb-storage 4-1:1.0
Dec 26 00:45:38 panther vmunix: [ 2337.245770] usbcore: registered new
interface driver usb-storage
Dec 26 00:45:39 panther vmunix: [ 2338.244729] scsi 2:0:0:0: Direct-Access
Samsung SSD 850 EVO 500G 0114 PQ: 0 ANSI: 6
Dec 26 00:45:39 panther vmunix: [ 2338.245308] sd 2:0:0:0: Attached scsi
generic sg2 type 0
Dec 26 00:45:39 panther vmunix: [ 2338.247115] sd 2:0:0:0: [sdb] Spinning up
disk...
Dec 26 00:45:49 panther vmunix: [ 2339.251034] .........
Dec 26 00:45:52 panther vmunix: [ 2348.278894] ....ready
Dec 26 00:45:52 panther vmunix: [ 2351.288429] sd 2:0:0:0: [sdb] 976773168
512-byte logical blocks: (500 GB/465 GiB)
Dec 26 00:45:52 panther vmunix: [ 2351.288953] sd 2:0:0:0: [sdb] Write Protect
is off
Dec 26 00:45:52 panther vmunix: [ 2351.288959] sd 2:0:0:0: [sdb] Mode Sense:
47 00 10 08
Dec 26 00:45:52 panther vmunix: [ 2351.289447] sd 2:0:0:0: [sdb] Write cache:
enabled, read cache: enabled, supports DPO and FUA
Dec 26 00:45:52 panther vmunix: [ 2351.293763] sdb: sdb1 sdb2 sdb3
Dec 26 00:45:52 panther vmunix: [ 2351.295862] sd 2:0:0:0: [sdb] Attached SCSI
disk
Dec 26 00:47:02 panther vmunix: [ 2421.091552] EXT4-fs (sdb1): mounted
filesystem with ordered data mode. Opts: (null)
Dec 26 00:47:09 panther vmunix: [ 2428.394003] sd 2:0:0:0: [sdb] Invalid
command failure
Dec 26 00:47:09 panther vmunix: [ 2428.394013] sd 2:0:0:0: [sdb]
Dec 26 00:47:09 panther vmunix: [ 2428.394017] Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
Dec 26 00:47:09 panther vmunix: [ 2428.394021] sd 2:0:0:0: [sdb]
Dec 26 00:47:09 panther vmunix: [ 2428.394024] Sense Key : Illegal Request
[current]
Dec 26 00:47:09 panther vmunix: [ 2428.394030] sd 2:0:0:0: [sdb]
Dec 26 00:47:09 panther vmunix: [ 2428.394034] Add. Sense: Invalid field in cdb
Dec 26 00:47:09 panther vmunix: [ 2428.394038] sd 2:0:0:0: [sdb] CDB:
Dec 26 00:47:09 panther vmunix: [ 2428.394040] Write(10): 2a 08 02 04 08 20 00
00 08 00
Dec 26 00:47:09 panther vmunix: [ 2428.394054] end_request: critical target
error, dev sdb, sector 33818656
Dec 26 00:47:09 panther vmunix: [ 2428.394059] end_request: critical target
error, dev sdb, sector 33818656
Dec 26 00:47:09 panther vmunix: [ 2428.394120] Aborting journal on device sdb1-8.
Dec 26 00:47:09 panther vmunix: [ 2428.471535] EXT4-fs error (device sdb1):
ext4_journal_check_start:56: Detected aborted journal
Dec 26 00:47:09 panther vmunix: [ 2428.471547] EXT4-fs (sdb1): Remounting
filesystem read-only
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# sdparm -a --long /dev/sda
/dev/sda: ATA Samsung SSD 850 1B6Q
Direct access device specific parameters: WP=0 DPOFUA=0
Read write error recovery [rw] mode page:
AWRE 1 [cha: n, def: 1] Automatic write reallocation enabled
ARRE 0 [cha: n, def: 0] Automatic read reallocation enabled
TB 0 [cha: n, def: 0] Transfer block
RC 0 [cha: n, def: 0] Read continuous
EER 0 [cha: n, def: 0] Enable early recovery
PER 0 [cha: n, def: 0] Post error
DTE 0 [cha: n, def: 0] Data terminate on error
DCR 0 [cha: n, def: 0] Disable correction
RRC 0 [cha: n, def: 0] Read retry count
COR_S 0 [cha: n, def: 0] Correction span (obsolete)
HOC 0 [cha: n, def: 0] Head offset count (obsolete)
DSOC 0 [cha: n, def: 0] Data strobe offset count (obsolete)
LBPERE 0 [cha: n, def: 0] Logical block provisioning error
reporting enabled
WRC 0 [cha: n, def: 0] Write retry count
RTL 0 [cha: n, def: 0] Recovery time limit (ms)
Caching (SBC) [ca] mode page:
IC 0 [cha: n, def: 0] Initiator control
ABPF 0 [cha: n, def: 0] Abort pre-fetch
CAP 0 [cha: n, def: 0] Caching analysis permitted
DISC 0 [cha: n, def: 0] Discontinuity
SIZE 0 [cha: n, def: 0] Size enable
WCE 1 [cha: y, def: 1] Write cache enable
MF 0 [cha: n, def: 0] Multiplication factor
RCD 0 [cha: n, def: 0] Read cache disable
DRRP 0 [cha: n, def: 0] Demand read retention priority
WRP 0 [cha: n, def: 0] Write retention priority
DPTL 0 [cha: n, def: 0] Disable pre-fetch transfer length
MIPF 0 [cha: n, def: 0] Minimum pre-fetch
MAPF 0 [cha: n, def: 0] Maximum pre-fetch
MAPFC 0 [cha: n, def: 0] Maximum pre-fetch ceiling
FSW 0 [cha: n, def: 0] Force sequential write
LBCSS 0 [cha: n, def: 0] Logical block cache segment size
DRA 0 [cha: n, def: 0] Disable read ahead
SYNC_PROG 0 [cha: n, def: 0] Synchronous cache progress indication
NV_DIS 0 [cha: n, def: 0] Non-volatile cache disable
NCS 0 [cha: n, def: 0] Number of cache segments
CSS 0 [cha: n, def: 0] Cache segment size
Control [co] mode page:
TST 0 [cha: n, def: 0] Task set type
TMF_ONLY 0 [cha: n, def: 0] Task management functions only
DPICZ 0 [cha: n, def: 0] Disable protection information check if
protect field zero
D_SENSE 0 [cha: n, def: 0] Descriptor format sense data
GLTSD 1 [cha: n, def: 1] Global logging target save disable
RLEC 0 [cha: n, def: 0] Report log exception condition
QAM 0 [cha: n, def: 0] Queue algorithm modifier
NUAR 0 [cha: n, def: 0] No unit attention on release
QERR 0 [cha: n, def: 0] Queue error management
RAC 0 [cha: n, def: 0] Report a check
UA_INTLCK 0 [cha: n, def: 0] Unit attention interlocks control
SWP 0 [cha: n, def: 0] Software write protect
ATO 0 [cha: n, def: 0] Application tag owner
TAS 0 [cha: n, def: 0] Task aborted status
ATMPE 0 [cha: n, def: 0] Application tag mode page enabled
RWWP 0 [cha: n, def: 0] Reject write without protection
AUTOLOAD 0 [cha: n, def: 0] Autoload mode
BTP -1 [cha: n, def: -1] Busy timeout period (100us)
ESTCT 30 [cha: n, def: 30] Extended self test completion time (sec)
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# sdparm -a --long /dev/sdb
/dev/sdb: Samsung SSD 850 EVO 500G 0114
Direct access device specific parameters: WP=0 DPOFUA=1
Caching (SBC) [ca] mode page:
IC 0 [cha: n, def: 0, sav: 0] Initiator control
ABPF 0 [cha: n, def: 0, sav: 0] Abort pre-fetch
CAP 0 [cha: n, def: 0, sav: 0] Caching analysis permitted
DISC 1 [cha: n, def: 1, sav: 1] Discontinuity
SIZE 0 [cha: n, def: 0, sav: 0] Size enable
WCE 1 [cha: n, def: 1, sav: 1] Write cache enable
MF 0 [cha: n, def: 0, sav: 0] Multiplication factor
RCD 0 [cha: n, def: 0, sav: 0] Read cache disable
DRRP 0 [cha: n, def: 0, sav: 0] Demand read retention priority
WRP 0 [cha: n, def: 0, sav: 0] Write retention priority
DPTL -1 [cha: n, def: -1, sav: -1] Disable pre-fetch transfer length
MIPF 0 [cha: n, def: 0, sav: 0] Minimum pre-fetch
MAPF -1 [cha: n, def: -1, sav: -1] Maximum pre-fetch
MAPFC -1 [cha: n, def: -1, sav: -1] Maximum pre-fetch ceiling
FSW 0 [cha: n, def: 0, sav: 0] Force sequential write
LBCSS 0 [cha: n, def: 0, sav: 0] Logical block cache segment size
DRA 0 [cha: n, def: 0, sav: 0] Disable read ahead
SYNC_PROG 0 [cha: n, def: 0, sav: 0] Synchronous cache progress
indication
NV_DIS 0 [cha: n, def: 0, sav: 0] Non-volatile cache disable
NCS 255 [cha: n, def:255, sav:255] Number of cache segments
CSS 0 [cha: n, def: 0, sav: 0] Cache segment size
Power condition [po] mode page:
PM_BG 0 [cha: n, def: 0, sav: 0] Power management, background
functions, precedence
STANDBY_Y 0 [cha: n, def: 0, sav: 0] Standby_y timer enable
IDLE_C 0 [cha: n, def: 0, sav: 0] Idle_c timer enable
IDLE_B 0 [cha: n, def: 0, sav: 0] Idle_b timer enable
IDLE 0 [cha: n, def: 0, sav: 0] Idle_a timer enable
STANDBY 0 [cha: y, def: 1, sav: 0] Standby_z timer enable
ICT 0 [cha: n, def: 0, sav: 0] Idle_a condition timer (100 ms)
SCT 0 [cha: y, def:18000, sav: 0] Standby_z condition timer (100 ms)
IBCT 0 [cha: n, def: 0, sav: 0] Idle_b condition timer (100 ms)
ICCT 0 [cha: n, def: 0, sav: 0] Idle_c condition timer (100 ms)
SYCT 0 [cha: n, def: 0, sav: 0] Standby_y condition timer (100 ms)
CCF_IDLE 0 [cha: n, def: 0, sav: 0] check condition on transition
from idle
CCF_STAND 0 [cha: n, def: 0, sav: 0] check condition on transition
from standby
CCF_STOPP 0 [cha: n, def: 0, sav: 0] check condition on transition
from stopped
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