CPU IDLE 低是由于磁盘损坏造成的,这里是这种情况吗

CPU IDLE 低是由于磁盘损坏造成的,这里是这种情况吗

CPU IDLE 低可能由多种因素引起,包括: RAM 不足或硬盘驱动器速度慢

但在我们的 RHEL 服务器 RAM 内存中有足够的 RAM,但从 dmesg 中我们发现了几个有关磁盘驱动器的错误

我们的怀疑与磁盘有关,例如 sdk 和 sdc,因为我们从 dmesg 错误中看到:[sdk] tag#0 Add. Sense: Unrecovered read error

sar这里是显示 CPU IDLE 值的命令的详细信息

    09:43:56 AM     CPU     %user     %nice   %system   %iowait    %steal     %idle
    09:44:01 AM     all     98.57      0.00      0.62      0.00      0.00      0.80
    09:44:06 AM     all     98.26      0.00      0.92      0.01      0.00      0.81
    09:44:11 AM     all     97.29      0.00      1.66      0.01      0.00      1.03
    09:44:16 AM     all     92.81      0.00      6.06      0.03      0.00      1.10
    09:44:21 AM     all     92.31      0.00      6.43      0.05      0.00      1.21
    Average:        all     95.85      0.00      3.14      0.02      0.00      0.99


09:44:21 AM     CPU     %user     %nice   %system   %iowait    %steal     %idle
09:44:22 AM     all     96.52      0.00      3.10      0.00      0.00      0.38
09:44:22 AM       0     98.00      0.00      2.00      0.00      0.00      0.00
09:44:22 AM       1     98.00      0.00      2.00      0.00      0.00      0.00
09:44:22 AM       2    100.00      0.00      0.00      0.00      0.00      0.00
09:44:22 AM       3     98.00      0.00      2.00      0.00      0.00      0.00
09:44:22 AM       4     98.00      0.00      2.00      0.00      0.00      0.00
09:44:22 AM       5     98.00      0.00      2.00      0.00      0.00      0.00
09:44:22 AM       6     97.98      0.00      2.02      0.00      0.00      0.00
09:44:22 AM       7     97.98      0.00      2.02      0.00      0.00      0.00
09:44:22 AM       8     98.99      0.00      1.01      0.00      0.00      0.00
09:44:22 AM       9     98.00      0.00      2.00      0.00      0.00      0.00
09:44:22 AM      10     98.00      0.00      2.00      0.00      0.00      0.00
09:44:22 AM      11     98.02      0.00      0.99      0.00      0.00      0.99
09:44:22 AM      12     97.00      0.00      1.00      0.00      0.00      2.00
09:44:22 AM      13     96.97      0.00      3.03      0.00      0.00      0.00
09:44:22 AM      14     98.02      0.00      0.99      0.00      0.00      0.99
09:44:22 AM      15     94.00      0.00      6.00      0.00      0.00      0.00
09:44:22 AM      16     83.00      0.00     16.00      0.00      0.00      1.00
09:44:22 AM      17     98.00      0.00      1.00      0.00      0.00      1.00
09:44:22 AM      18     96.97      0.00      2.02      0.00      0.00      1.01
09:44:22 AM      19     96.00      0.00      4.00      0.00      0.00      0.00
09:44:22 AM      20     97.98      0.00      1.01      0.00      0.00      1.01
09:44:22 AM      21     95.05      0.00      4.95      0.00      0.00      0.00
09:44:22 AM      22     94.95      0.00      5.05      0.00      0.00      0.00
09:44:22 AM      23     98.99      0.00      1.01      0.00      0.00      0.00
09:44:22 AM      24     98.99      0.00      1.01      0.00      0.00      0.00
09:44:22 AM      25     99.00      0.00      1.00      0.00      0.00      0.00
09:44:22 AM      26     98.99      0.00      1.01      0.00      0.00      0.00
09:44:22 AM      27     98.99      0.00      1.01      0.00      0.00      0.00
09:44:22 AM      28     98.00      0.00      2.00      0.00      0.00      0.00
09:44:22 AM      29     98.00      0.00      2.00      0.00      0.00      0.00
09:44:22 AM      30     94.95      0.00      5.05      0.00      0.00      0.00
09:44:22 AM      31     97.03      0.00      1.98      0.00      0.00      0.99
09:44:22 AM      32     98.02      0.00      1.98      0.00      0.00      0.00
09:44:22 AM      33     99.00      0.00      1.00      0.00      0.00      0.00
09:44:22 AM      34     98.00      0.00      1.00      0.00      0.00      1.00
09:44:22 AM      35     97.98      0.00      2.02      0.00      0.00      0.00
09:44:22 AM      36     94.00      0.00      5.00      0.00      0.00      1.00
09:44:22 AM      37     98.02      0.00      0.99      0.00      0.00      0.99
09:44:22 AM      38     97.98      0.00      1.01      0.00      0.00      1.01
09:44:22 AM      39     89.00      0.00     11.00      0.00      0.00      0.00
09:44:22 AM      40     83.00      0.00     13.00      0.00      0.00      4.00
09:44:22 AM      41     97.00      0.00      3.00      0.00      0.00      0.00
09:44:22 AM      42     91.92      0.00      8.08      0.00      0.00      0.00
09:44:22 AM      43     94.06      0.00      5.94      0.00      0.00      0.00
09:44:22 AM      44     92.93      0.00      7.07      0.00      0.00      0.00
09:44:22 AM      45     97.00      0.00      3.00      0.00      0.00      0.00
09:44:22 AM      46     99.00      0.00      1.00      0.00      0.00      0.00
09:44:22 AM      47     98.99      0.00      1.01      0.00      0.00      0.00

sar -B 2 5

09:44:24 AM  pgpgin/s pgpgout/s   fault/s  majflt/s  pgfree/s pgscank/s pgscand/s pgsteal/s    %vmeff
09:44:26 AM  14852.00  71776.00 101443.50      0.00 216420.00      0.00      0.00      0.00      0.00
09:44:28 AM  14336.00    184.00   5123.00      0.00  47167.50      0.00      0.00      0.00      0.00
09:44:30 AM  14418.00 203778.00  67194.50      0.00 132952.50      0.00      0.00      0.00      0.00
09:44:32 AM  14352.00 220796.00   2475.00      0.00  59666.00      0.00      0.00      0.00      0.00
09:44:34 AM  13318.00  56996.00  16290.00      0.00   9599.00      0.00      0.00      0.00      0.00
Average:     14255.20 110706.00  38505.20      0.00  93161.00      0.00      0.00      0.00      0.00

来自vmstat命令

procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
65  0 3505188 6265864 4828612 304096576    0    0   137   127    0    0 49  1 50  0  0
63  1 3505188 6068484 4828660 304294848    0    0 12292 41500 95782 88751 98  2  1  0  0
66  0 3505188 5933464 4828672 304429248    0    0 14668 130968 85788 90844 97  2  1  0  0

r:等待运行时的进程数。

从内核消息中我们得到:

[117426425.532990] blk_update_request: critical medium error, dev sdc, sector 116127985
[117426431.038365] sd 0:0:3:0: [sdc] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[117426431.038374] sd 0:0:3:0: [sdc] tag#0 Sense Key : Medium Error [current] [descriptor] 
[117426431.038378] sd 0:0:3:0: [sdc] tag#0 Add. Sense: Unrecovered read error
[117426431.038383] sd 0:0:3:0: [sdc] tag#0 CDB: Read(16) 88 00 00 00 00 00 06 eb f8 f0 00 00 00 08 00 00
[117426431.038386] blk_update_request: critical medium error, dev sdc, sector 116127985
[139602560.596832] traps: polkitd[27641] general protection ip:7f7996318cf2 sp:7ffe7a28e5b0 error:0 in libmozjs-17.0.so[7f79961da000+3b3000]
[144770588.094226] sd 0:0:11:0: [sdk] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[144770588.094238] sd 0:0:11:0: [sdk] tag#0 Sense Key : Medium Error [current] [descriptor] 
[144770588.094242] sd 0:0:11:0: [sdk] tag#0 Add. Sense: Unrecovered read error
[144770588.094248] sd 0:0:11:0: [sdk] tag#0 CDB: Read(16) 88 00 00 00 00 00 01 15 20 00 00 00 02 00 00 00

那么根据上面的输出,CPU IDLE 非常低的根本原因是因为我们从内核消息中得到的磁盘错误,这是否有意义?

答案1

根据时间戳,日志中的两个磁盘错误之间已经过去了近一年,所以不,它们不是您的系统不空闲的原因。

顺便说一句,请注意

r:等待运行时的进程数。

不准确:在 中vmstat,该r列显示可运行进程的数量,IE正在运行或等待运行的进程数。如果您有许多逻辑 CPU,那么此处的数字较大并不是问题。

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