我最近将我的服务器升级到了 Centos 7；我要求用户备份升级数据。升级后，一些用户尝试解压备份 tar（~300Gb），这导致服务器挂起/冻结。（不响应键盘/ssh 输入）（可重现）其他占用大量资源的二进制文件也发生了这种情况。
我监控了内存和 CPU，在冻结之前，两者都是合理的，因此结论是Centos 主板是 I/0 限制。这似乎是正确的，因为解决方法nice成功完成了解压。
我的问题是，我如何确定这种情况不会再发生？（我可以限制 I/0 吗？）这是一台“离线”机器，因此用户希望有很大的自由进行实验。（但显然我们不想每天都重置机器。）我可以默认使用 nice 进程吗？或者限制 I/0 以使机器不会“冻结”？系统正在运行具有 6 x 上的 raid 6 的 raidcontrollerWestern Digital RE4
参考规格：（工作量减少至 19）
iotop：（最大约60M/s）
Total DISK READ : 51.72 M/s | Total DISK WRITE : 42.40 M/s
Actual DISK READ: 786.07 K/s | Actual DISK WRITE: 131.94 K/s
顶部同时：
top - 09:58:27 up 1 day, 26 min, 6 users, load average: 142.30, 144.85, 148.19
Tasks: 785 total, 8 running, 777 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.0 us, 6.5 sy, 93.0 ni, 0.0 id, 0.1 wa, 0.0 hi, 0.3 si, 0.0 st
KiB Mem : 52838147+total, 707112 free, 51992025+used, 7754104 buff/cache
KiB Swap: 4194300 total, 0 free, 4194300 used. 7746868 avail Mem
免费-m
total used free shared buff/cache available
Mem: 515997 507679 719 3 7598 7631
Swap: 4095 4095 0
猫/proc/cpuinfo
processor : 63
vendor_id : GenuineIntel
cpu family : 6
model : 47
model name : Intel(R) Xeon(R) CPU E7- 4830 @ 2.13GHz
stepping : 2
microcode : 0x37
cpu MHz : 2134.000
cache size : 24576 KB
physical id : 3
siblings : 16
core id : 25
cpu cores : 8
apicid : 243
initial apicid : 243
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt aes lahf_lm ida arat epb dtherm tpr_shadow vnmi flexpriority ept vpid
bogomips : 4266.05
clflush size : 64
cache_alignment : 64
address sizes : 44 bits physical, 48 bits virtual
power management:
lspci（RAID 控制器）
02:00.0 RAID bus controller: 3ware Inc 9750 SAS2/SATA-II RAID PCIe (rev 05)
系统 ：
cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)
uname -r
3.10.0-327.el7.x86_64
lspci
00:00.0 Host bridge: Intel Corporation 5520/5500/X58 I/O Hub to ESI Port (rev 22)
00:01.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 1 (rev 22)
00:03.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 3 (rev 22)
00:07.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 7 (rev 22)
00:13.0 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub I/OxAPIC Interrupt Controller (rev 22)
00:14.0 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub System Management Registers (rev 22)
00:14.1 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub GPIO and Scratch Pad Registers (rev 22)
00:14.2 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub Control Status and RAS Registers (rev 22)
00:14.3 PIC: Intel Corporation 7500/5520/5500/X58 I/O Hub Throttle Registers (rev 22)
00:1a.0 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #4
00:1a.1 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #5
00:1a.2 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #6
00:1a.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #2
00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 Family) HD Audio Controller
00:1c.0 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Root Port 1
00:1d.0 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #1
00:1d.1 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #2
00:1d.2 USB controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #3
00:1d.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #1
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 90)
00:1f.0 ISA bridge: Intel Corporation 82801JIR (ICH10R) LPC Interface Controller
00:1f.2 IDE interface: Intel Corporation 82801JI (ICH10 Family) 4 port SATA IDE Controller #1
00:1f.3 SMBus: Intel Corporation 82801JI (ICH10 Family) SMBus Controller
00:1f.5 IDE interface: Intel Corporation 82801JI (ICH10 Family) 2 port SATA IDE Controller #2
02:00.0 RAID bus controller: 3ware Inc 9750 SAS2/SATA-II RAID PCIe (rev 05)
04:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01)
04:00.1 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01)
05:01.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200eW WPCM450 (rev 0a)
fc:00.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 1 (rev 0c)
fc:00.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 2 (rev 0c)
fc:00.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 3 (rev 0c)
fc:00.6 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 4 (rev 0c)
fc:01.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Power Controller (rev 0c)
fc:02.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Caching Agent 0 (rev 0c)
fc:03.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Caching Agent 1 (rev 0c)
fc:04.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Home Agent 0 (rev 0c)
fc:05.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0a (rev 0c)
fc:05.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0b (rev 0c)
fc:05.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0c (rev 0c)
fc:05.6 Host bridge: Intel Corporation Device 2b53 (rev 0c)
fc:06.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Home Agent 1 (rev 0c)
fc:07.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1a (rev 0c)
fc:07.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1b (rev 0c)
fc:07.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1c (rev 0c)
fc:07.6 Host bridge: Intel Corporation Device 2b5b (rev 0c)
fc:08.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 0 (rev 0c)
fc:09.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 1 (rev 0c)
fc:0a.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 2 (rev 0c)
fc:0b.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 3 (rev 0c)
fc:0c.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 4 (rev 0c)
fc:0d.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 5 (rev 0c)
fc:0e.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 6 (rev 0c)
fc:0f.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 7 (rev 0c)
fc:10.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 0-1 (rev 0c)
fc:10.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 2-3 (rev 0c)
fc:10.4 Host bridge: Intel Corporation Device 2b32 (rev 0c)
fc:10.6 Host bridge: Intel Corporation Device 2b3a (rev 0c)
fc:11.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 4-5 (rev 0c)
fc:11.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 6-7 (rev 0c)
fc:11.4 Host bridge: Intel Corporation Device 2b36 (rev 0c)
fc:11.6 Host bridge: Intel Corporation Device 2b3e (rev 0c)
fc:12.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Test and Debug 0 (rev 0c)
fc:13.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Test and Debug 1 (rev 0c)
fc:14.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 0: REUT control/status (rev 0c)
fc:14.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 0: Misc. control/status (rev 0c)
fc:15.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 1: REUT control/status (rev 0c)
fc:15.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 1: Misc. control/status (rev 0c)
fc:17.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 3: REUT control/status (rev 0c)
fc:17.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 3: Misc. control/status (rev 0c)
fc:18.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 0: REUT control/status (rev 0c)
fc:18.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 0: Misc control/status (rev 0c)
fc:19.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 1: REUT control/status (rev 0c)
fc:19.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 1: Misc control/status (rev 0c)
fc:1a.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 8 (rev 0c)
fc:1b.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 9 (rev 0c)
fd:00.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 1 (rev 0c)
fd:00.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 2 (rev 0c)
fd:00.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 3 (rev 0c)
fd:00.6 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 4 (rev 0c)
fd:01.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Power Controller (rev 0c)
fd:02.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Caching Agent 0 (rev 0c)
fd:03.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Caching Agent 1 (rev 0c)
fd:04.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Home Agent 0 (rev 0c)
fd:05.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0a (rev 0c)
fd:05.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0b (rev 0c)
fd:05.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0c (rev 0c)
fd:05.6 Host bridge: Intel Corporation Device 2b53 (rev 0c)
fd:06.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Home Agent 1 (rev 0c)
fd:07.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1a (rev 0c)
fd:07.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1b (rev 0c)
fd:07.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1c (rev 0c)
fd:07.6 Host bridge: Intel Corporation Device 2b5b (rev 0c)
fd:08.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 0 (rev 0c)
fd:09.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 1 (rev 0c)
fd:0a.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 2 (rev 0c)
fd:0b.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 3 (rev 0c)
fd:0c.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 4 (rev 0c)
fd:0d.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 5 (rev 0c)
fd:0e.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 6 (rev 0c)
fd:0f.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 7 (rev 0c)
fd:10.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 0-1 (rev 0c)
fd:10.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 2-3 (rev 0c)
fd:10.4 Host bridge: Intel Corporation Device 2b32 (rev 0c)
fd:10.6 Host bridge: Intel Corporation Device 2b3a (rev 0c)
fd:11.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 4-5 (rev 0c)
fd:11.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 6-7 (rev 0c)
fd:11.4 Host bridge: Intel Corporation Device 2b36 (rev 0c)
fd:11.6 Host bridge: Intel Corporation Device 2b3e (rev 0c)
fd:12.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Test and Debug 0 (rev 0c)
fd:13.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Test and Debug 1 (rev 0c)
fd:14.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 0: REUT control/status (rev 0c)
fd:14.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 0: Misc. control/status (rev 0c)
fd:15.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 1: REUT control/status (rev 0c)
fd:15.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 1: Misc. control/status (rev 0c)
fd:17.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 3: REUT control/status (rev 0c)
fd:17.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 3: Misc. control/status (rev 0c)
fd:18.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 0: REUT control/status (rev 0c)
fd:18.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 0: Misc control/status (rev 0c)
fd:19.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 1: REUT control/status (rev 0c)
fd:19.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 1: Misc control/status (rev 0c)
fd:1a.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 8 (rev 0c)
fd:1b.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 9 (rev 0c)
fe:00.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 1 (rev 0c)
fe:00.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 2 (rev 0c)
fe:00.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 3 (rev 0c)
fe:00.6 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 4 (rev 0c)
fe:01.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Power Controller (rev 0c)
fe:02.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Caching Agent 0 (rev 0c)
fe:03.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Caching Agent 1 (rev 0c)
fe:04.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Home Agent 0 (rev 0c)
fe:05.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0a (rev 0c)
fe:05.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0b (rev 0c)
fe:05.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0c (rev 0c)
fe:05.6 Host bridge: Intel Corporation Device 2b53 (rev 0c)
fe:06.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Home Agent 1 (rev 0c)
fe:07.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1a (rev 0c)
fe:07.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1b (rev 0c)
fe:07.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1c (rev 0c)
fe:07.6 Host bridge: Intel Corporation Device 2b5b (rev 0c)
fe:08.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 0 (rev 0c)
fe:09.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 1 (rev 0c)
fe:0a.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 2 (rev 0c)
fe:0b.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 3 (rev 0c)
fe:0c.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 4 (rev 0c)
fe:0d.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 5 (rev 0c)
fe:0e.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 6 (rev 0c)
fe:0f.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 7 (rev 0c)
fe:10.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 0-1 (rev 0c)
fe:10.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 2-3 (rev 0c)
fe:10.4 Host bridge: Intel Corporation Device 2b32 (rev 0c)
fe:10.6 Host bridge: Intel Corporation Device 2b3a (rev 0c)
fe:11.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 4-5 (rev 0c)
fe:11.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 6-7 (rev 0c)
fe:11.4 Host bridge: Intel Corporation Device 2b36 (rev 0c)
fe:11.6 Host bridge: Intel Corporation Device 2b3e (rev 0c)
fe:12.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Test and Debug 0 (rev 0c)
fe:13.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Test and Debug 1 (rev 0c)
fe:14.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 0: REUT control/status (rev 0c)
fe:14.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 0: Misc. control/status (rev 0c)
fe:15.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 1: REUT control/status (rev 0c)
fe:15.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 1: Misc. control/status (rev 0c)
fe:16.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 2: REUT control/status (rev 0c)
fe:16.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 2: Misc. control/status (rev 0c)
fe:17.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 3: REUT control/status (rev 0c)
fe:17.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 3: Misc. control/status (rev 0c)
fe:18.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 0: REUT control/status (rev 0c)
fe:18.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 0: Misc control/status (rev 0c)
fe:19.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 1: REUT control/status (rev 0c)
fe:19.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 1: Misc control/status (rev 0c)
fe:1a.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 8 (rev 0c)
fe:1b.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 9 (rev 0c)
ff:00.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 1 (rev 0c)
ff:00.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 2 (rev 0c)
ff:00.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 3 (rev 0c)
ff:00.6 Host bridge: Intel Corporation Xeon Processor E7 Product Family System Configuration Controller 4 (rev 0c)
ff:01.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Power Controller (rev 0c)
ff:02.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Caching Agent 0 (rev 0c)
ff:03.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Caching Agent 1 (rev 0c)
ff:04.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Home Agent 0 (rev 0c)
ff:05.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0a (rev 0c)
ff:05.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0b (rev 0c)
ff:05.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 0c (rev 0c)
ff:05.6 Host bridge: Intel Corporation Device 2b53 (rev 0c)
ff:06.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Home Agent 1 (rev 0c)
ff:07.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1a (rev 0c)
ff:07.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1b (rev 0c)
ff:07.4 Host bridge: Intel Corporation Xeon Processor E7 Product Family Memory Controller 1c (rev 0c)
ff:07.6 Host bridge: Intel Corporation Device 2b5b (rev 0c)
ff:08.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 0 (rev 0c)
ff:09.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 1 (rev 0c)
ff:0a.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 2 (rev 0c)
ff:0b.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 3 (rev 0c)
ff:0c.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 4 (rev 0c)
ff:0d.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 5 (rev 0c)
ff:0e.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 6 (rev 0c)
ff:0f.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 7 (rev 0c)
ff:10.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 0-1 (rev 0c)
ff:10.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 2-3 (rev 0c)
ff:10.4 Host bridge: Intel Corporation Device 2b32 (rev 0c)
ff:10.6 Host bridge: Intel Corporation Device 2b3a (rev 0c)
ff:11.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 4-5 (rev 0c)
ff:11.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Router Port 6-7 (rev 0c)
ff:11.4 Host bridge: Intel Corporation Device 2b36 (rev 0c)
ff:11.6 Host bridge: Intel Corporation Device 2b3e (rev 0c)
ff:12.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Test and Debug 0 (rev 0c)
ff:13.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Test and Debug 1 (rev 0c)
ff:14.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 0: REUT control/status (rev 0c)
ff:14.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 0: Misc. control/status (rev 0c)
ff:15.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 1: REUT control/status (rev 0c)
ff:15.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 1: Misc. control/status (rev 0c)
ff:16.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 2: REUT control/status (rev 0c)
ff:16.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 2: Misc. control/status (rev 0c)
ff:17.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 3: REUT control/status (rev 0c)
ff:17.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family QPI Physical Port 3: Misc. control/status (rev 0c)
ff:18.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 0: REUT control/status (rev 0c)
ff:18.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 0: Misc control/status (rev 0c)
ff:19.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 1: REUT control/status (rev 0c)
ff:19.2 Host bridge: Intel Corporation Xeon Processor E7 Product Family SMI Physical Port 1: Misc control/status (rev 0c)
ff:1a.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 8 (rev 0c)
ff:1b.0 Host bridge: Intel Corporation Xeon Processor E7 Product Family Last Level Cache Coherence Engine 9 (rev 0c)
// 更新
- 在运行分配的 Java 作业时也发生了这种情况，文件系统在冻结之前感觉“很慢”。（ls -l、cat、...）
- 更改标题以反映工作量，而不仅仅是 tar。
答案1
升级过程中是否有任何硬件发生变化？
另请发布“lspci”输出。
这听起来确实是一个相当困难的问题，因为我有几台 EL7 机器，负载相当重，但没有任何问题。
答案2
最后，它似乎是某种新的内核“功能”。在社区的帮助下，这似乎有效：/etc/sysctl.d/01-tune.conf（新文件）# /proc/sys/vm/swappiness # 60 # /proc/sys/vm/vfs_cache_pressure # 100
# don't swap, our disks are slow
# and we have plenty of memory
vm.swappiness=5
# lesser reclaim of "VFS caches, versus pagecache and swap"
vm.vfs_cache_pressure=50