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Hi, good evening,
about two weeks ago I started recieving random
Input/output error command not foundmessages whenever I tried to use a command in zsh (exit did work though), during thoes times i3status would always change and only display
Error: status_command process exited unexpectedly (exit 0). Only way out is a forced shutdown (or magic sysrq, which I didn't know about two weeks ago).
Suspend to RAM also results in a cold boot sometimes.
Now, according to the almighty internet this usually means that the disk is about to fail. As I was not able to fix it I decided to reinstall arch (which I was going to do anyway, so no harm done). I formatted and chose the same partition for / as before, which (afaik) shoudn't matter since SSDs move their blocks all over the place and should, in theory, mask out any bad blocks.
Unfortunately this did not fix the issue, it kept happening from anywhere between twice a day to once every three days, so next thing to do was to look at the SMART values again:
=== START OF INFORMATION SECTION ===
Model Number: Samsung SSD 960 EVO 500GB
Serial Number: ...
Firmware Version: 2B7QCXE7
PCI Vendor/Subsystem ID: 0x144d
IEEE OUI Identifier: 0x002538
Total NVM Capacity: 500,107,862,016 [500 GB]
Unallocated NVM Capacity: 0
Controller ID: 2
Number of Namespaces: 1
Namespace 1 Size/Capacity: 500,107,862,016 [500 GB]
Namespace 1 Utilization: 112,968,286,208 [112 GB]
Namespace 1 Formatted LBA Size: 512
Local Time is: Sat Jun 10 01:20:40 2017 CEST
Firmware Updates (0x16): 3 Slots, no Reset required
Optional Admin Commands (0x0007): Security Format Frmw_DL
Optional NVM Commands (0x001f): Comp Wr_Unc DS_Mngmt Wr_Zero Sav/Sel_Feat
Maximum Data Transfer Size: 512 Pages
Warning Comp. Temp. Threshold: 77 Celsius
Critical Comp. Temp. Threshold: 79 Celsius
Supported Power States
St Op Max Active Idle RL RT WL WT Ent_Lat Ex_Lat
0 + 6.04W - - 0 0 0 0 0 0
1 + 5.09W - - 1 1 1 1 0 0
2 + 4.08W - - 2 2 2 2 0 0
3 - 0.0400W - - 3 3 3 3 210 1500
4 - 0.0050W - - 4 4 4 4 2200 6000
Supported LBA Sizes (NSID 0x1)
Id Fmt Data Metadt Rel_Perf
0 + 512 0 0
=== START OF SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
SMART/Health Information (NVMe Log 0x02, NSID 0x1)
Critical Warning: 0x00
Temperature: 34 Celsius
Available Spare: 100%
Available Spare Threshold: 10%
Percentage Used: 0%
Data Units Read: 2,529,819 [1.29 TB]
Data Units Written: 2,878,132 [1.47 TB]
Host Read Commands: 49,307,219
Host Write Commands: 29,410,681
Controller Busy Time: 128
Power Cycles: 742
Power On Hours: 904
Unsafe Shutdowns: 143
Media and Data Integrity Errors: 0
Error Information Log Entries: 1,480
Warning Comp. Temperature Time: 0
Critical Comp. Temperature Time: 0
Temperature Sensor 1: 34 Celsius
Temperature Sensor 2: 35 Celsius
Error Information (NVMe Log 0x01, max 64 entries)
Num ErrCount SQId CmdId Status PELoc LBA NSID VS
0 1480 0 0x0008 0x4004 0x028 0 0 -
1 1479 0 0x0002 0x4004 0x028 0 0 -
2 1478 0 0x0008 0x4004 0x028 0 0 -
3 1477 0 0x0002 0x4004 0x028 0 0 -
4 1476 0 0x0008 0x4004 0x028 0 0 -
5 1475 0 0x0002 0x4004 0x028 0 0 -
6 1474 0 0x0008 0x4004 0x028 0 0 -
7 1473 0 0x0002 0x4004 0x028 0 0 -
8 1472 0 0x0008 0x4004 0x028 0 0 -
9 1471 0 0x0002 0x4004 0x028 0 0 -
10 1470 0 0x0008 0x4004 0x028 0 0 -
11 1469 0 0x0002 0x4004 0x028 0 0 -
12 1468 0 0x0008 0x4004 0x028 0 0 -
13 1467 0 0x0002 0x4004 0x028 0 0 -
14 1466 0 0x0008 0x4004 0x028 0 0 -
15 1465 0 0x0002 0x4004 0x028 0 0 -
... (48 entries not shown)Apart from the 143 Unsafe Shutdowns which, considering I bought the SSD in January '17, seems way to high (thats about one every day or so. I'm pretty sure I would know about that). About a week ago that number was at 132.
A Samsung support person told me that all values were OK, so the SSD's condition was 'good'.
So, question time:
1. Did I miss something obvious?
2. How absolute are those numbers. I'm guessing they are not perfect and the SSD could still be defective? If so, is there any way to tell with certainty?
Unfortunately I don't have the tools with me to just plug it out and in again, I'll hopefully be able to try that next weekend.
I'm really looking forward to any suggestions you can come up with.
Regards and have a nice weekend
Alex
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