编辑1:

编辑1:

我遇到了一个问题,当我向 SSD 磁盘写入数据时,Ubuntu(目前是 17.10,但这个问题已经存在了好几个版本)会冻结,我需要查明这是软件问题还是我的 SSD 坏了。我在华硕 UX31E 笔记本电脑上运行 Ubuntu。我使用的是全盘加密(使用安装程序自动配置)。

我已经像这样测试了读取速度:

$ sudo hdparm -Tt /dev/mapper/sda5_crypt 

/dev/mapper/sda5_crypt:
 Timing cached reads:   9228 MB in  2.00 seconds = 4618.04 MB/sec
 Timing buffered disk reads: 1190 MB in  3.00 seconds = 396.46 MB/sec

对我来说这看起来像是一个不错的数字,让我们尝试写入磁盘:

$ LC_ALL=C dd if=/dev/zero of=~/out.bin bs=100M count=1
1+0 records in
1+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 16.882 s, 6.2 MB/s

哇,这真的很慢。尽管它是一个加密分区(512 位 aes-xts-plain64),但不应该花这么长时间,对吧?写入磁盘时我无法执行任何操作,它变得完全没有响应。我甚至无法移动鼠标指针。

我正在使用截止期限调度程序:

$ cat /sys/block/sda/queue/scheduler 
noop [deadline] cfq 

我想验证这是否是硬件问题,这样我就不会浪费钱购买新的 SSD。如何确定无响应的根本原因?

编辑1:

smartctl 输出:

[...]
SMART Attributes Data Structure revision number: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  5 Reallocated_Sector_Ct   0x0002   100   100   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0002   100   100   000    Old_age   Always       -       6160
 12 Power_Cycle_Count       0x0002   100   100   000    Old_age   Always       -       4420
171 Program_Fail_Count      0x0002   100   100   000    Old_age   Always       -       0
172 Erase_Fail_Count        0x0002   100   100   000    Old_age   Always       -       0
173 Avg_Write/Erase_Count   0x0002   100   100   000    Old_age   Always       -       84
174 Unexpect_Power_Loss_Ct  0x0002   100   100   000    Old_age   Always       -       4379
187 Reported_Uncorrect      0x0002   100   100   000    Old_age   Always       -       0
230 Perc_Write/Erase_Count  0x0002   100   100   000    Old_age   Always       -       280
232 Perc_Avail_Resrvd_Space 0x0003   100   100   005    Pre-fail  Always       -       0
234 Perc_Write/Erase_Ct_BC  0x0002   100   100   000    Old_age   Always       -       436
241 Total_LBAs_Written      0x0002   100   100   000    Old_age   Always       -       10526182882
242 Total_LBAs_Read         0x0002   100   100   000    Old_age   Always       -       9359492632
[...]
Warning! SMART Self-Test Log Structure error: invalid SMART checksum.
SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Interrupted (host reset)      70%     64397         -
# 2  Short offline       Interrupted (host reset)      50%     18010         -
# 3  Short offline       Interrupted (host reset)      70%     31469         -
# 4  Short offline       Interrupted (host reset)      60%     26654         -
# 5  Short offline       Interrupted (host reset)      70%     10910         -
# 6  Short offline       Interrupted (host reset)      70%     58379         -

我还尝试强制进行自检(多次),方法是从实时 CD 启动并运行smartctl -t short -C /dev/sda,等待时间明显长于指定时间。但是,当我尝试查看结果时,我无法:

$ smartctl -a /dev/sda
[...]
A mandatory SMART command failed: exiting. To continue, add one or more '-T permissive' options*
[...]

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