RAID 降级问题，进来的统统 diameter_cm += 2, length_cm += 3

smartctl 看 是不准确的，应该 smartctl -a 看一下，看下具体参数。很有可能坏道太多。

找 Dell 工程师来处理，给钱了干嘛还要给自己找麻烦

@onehao28 这个能帮忙看一下么？
···
smartctl 6.7 2018-08-04 r4747 [x86_64-linux-3.10.0-957.12.2.el7.x86_64] (daily-20180804)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Vendor: SEAGATE
Product: ST1200MM0099
Revision: ST31
Compliance: SPC-4
User Capacity: 1,200,243,695,616 bytes [1.20 TB]
Logical block size: 512 bytes
Formatted with type 2 protection
8 bytes of protection information per logical block
LU is fully provisioned
Rotation Rate: 10000 rpm
Form Factor: 2.5 inches
Logical Unit id: 0x5000c500bca87617
Serial number: WFK2RM60
Device type: disk
Transport protocol: SAS (SPL-3)
Local Time is: Wed Jun 5 09:10:55 2019 UTC
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
Temperature Warning: Disabled or Not Supported
Read Cache is: Enabled
Writeback Cache is: Disabled

=== START OF READ SMART DATA SECTION ===
SMART Health Status: OK

Grown defects during certification <not available>
Total blocks reassigned during format <not available>
Total new blocks reassigned = 1
Power on minutes since format <not available>
Current Drive Temperature: 34 C
Drive Trip Temperature: 60 C

Manufactured in week 49 of year 2018
Specified cycle count over device lifetime: 10000
Accumulated start-stop cycles: 20
Specified load-unload count over device lifetime: 300000
Accumulated load-unload cycles: 225
Elements in grown defect list: 39

Vendor (Seagate Cache) information
Blocks sent to initiator = 2181055139
Blocks received from initiator = 2453981
Blocks read from cache and sent to initiator = 13569935
Number of read and write commands whose size <= segment size = 35257
Number of read and write commands whose size > segment size = 0

Vendor (Seagate/Hitachi) factory information
number of hours powered up = 12.98
number of minutes until next internal SMART test = 51

Error counter log:
Errors Corrected by Total Correction Gigabytes Total
ECC rereads/ errors algorithm processed uncorrected
fast | delayed rewrites corrected invocations [10^9 bytes] errors
read: 2180959242 1 0 2180959243 0 1134.149 0
write: 0 0 0 0 0 1.352 0
verify: 1237 0 0 1237 26 0.000 0

Non-medium error count: 0

SMART Self-test log
Num Test Status segment LifeTime LBA_first_err [SK ASC ASQ]
Description number (hours)
# 1 Background long Failed in first segment 96 5 - [0x4 0x44 0x0]

Long (extended) Self-test duration: 6723 seconds [112.0 minutes]

scsiPrintBackgroundResults Failed [Input/output error]
Protocol Specific port log page for SAS SSP
relative target port id = 1
generation code = 2
number of phys = 1
phy identifier = 0
attached device type: SAS or SATA device
attached reason: unknown
reason: loss of dword synchronization
negotiated logical link rate: phy enabled; 12 Gbps
attached initiator port: ssp=1 stp=1 smp=1
attached target port: ssp=0 stp=0 smp=0
SAS address = 0x5000c500bca87615
attached SAS address = 0x54cd98f0469eb107
attached phy identifier = 7
Invalid DWORD count = 0
Running disparity error count = 0
Loss of DWORD synchronization = 6
Phy reset problem = 0
Phy event descriptors:
Invalid word count: 0
Running disparity error count: 0
Loss of dword synchronization count: 6
Phy reset problem count: 0
relative target port id = 2
generation code = 2
number of phys = 1
phy identifier = 1
attached device type: no device attached
attached reason: unknown
reason: unknown
negotiated logical link rate: phy enabled; unknown
attached initiator port: ssp=0 stp=0 smp=0
attached target port: ssp=0 stp=0 smp=0
SAS address = 0x5000c500bca87616
attached SAS address = 0x0
attached phy identifier = 0
Invalid DWORD count = 0
Running disparity error count = 0
Loss of DWORD synchronization = 0
Phy reset problem = 0
Phy event descriptors:
Invalid word count: 0
Running disparity error count: 0
Loss of dword synchronization count: 0
Phy reset problem count: 0
···

硬盘问题，显示 OK 只能表明还没到显示不 OK 的时候。