我想分享一下我使用上述磁盘时遇到的一件奇怪的事情。我有两个这样的
WDC WD40PURZ-85AKKY0
WDC WD40PURZ-85TTDY0
两者都是紫色的 4TB 硬盘。在将它们（以及其他 4TB 硬盘）用于阵列之前，我想检查一下硬盘，首先使用最简单的方法，使用 smartctl -i /devsd（识别的任何字母）检查硬盘的属性，然后我注意到
WDC WD40PURZ-85AKKY0 specs
Model Family: Western Digital Purple
Device Model: WDC WD40PURZ-85AKKY0
Firmware Version: 80.00A80
User Capacity: 4,000,787,030,016 bytes [4.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5400 rpm
Form Factor: 3.5 inches
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-3 T13/2161-D revision 5
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Fri Jan 15 01:37:42 2021 EET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
capabilities: (0x11) SMART execute Offline immediate.
No Auto Offline data collection support
Suspend Offline collection upon new command.
No Offline surface scan supported.
Self-test supported.
No Conveyance Self-test supported.
No Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
注意这 4 个“不”指的是
No Auto Offline data collection support.
No Offline surface scan supported.
No Conveyance Self-test supported.
No Selective Self-test supported
而另一台硬盘 WDC WD40PURZ-85TTDY0 完全相同的型号 - 相同的固件支持它们
Model Family: Western Digital Purple
Device Model: WDC WD40PURZ-85TTDY0
Firmware Version: 80.00A80
User Capacity: 4,000,787,030,016 bytes [4.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5400 rpm
Form Factor: 3.5 inches
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-3 T13/2161-D revision 5
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
capabilities: (0x7b) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new command.
Offline surface scan supported.
Self-test supported.
Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
怎么会这样？这些属性是
自动离线数据收集支持。
支持离线表面扫描。
支持运输自检。
支持选择性自我检测
从底层操作系统还是使用 smartctl 命令启用或禁用？
之后我还检查了 2 台 skyhawk 设备，也是 4tb，并询问了一些拥有紫色设备的朋友，他们都支持这 4 个属性。
你知道这里发生什么事吗？
PS 我曾经有个无用的想法，想在官方 wd 论坛上发布该帖子，但是该论坛似乎很久以前就消失了。
答案1
WD Purple 是专用于监控的硬盘，因此我并不指望它们能够导出详细的 SMART 统计数据。您有两种不同的驱动程序型号/版本（85AKKY0 与 85TTDY0），因此前者导出的 SMART 属性/功能可能较少。