使用edac工具来检测服务器内存故障.

随着虚拟化，Redis,BDB内存数据库等应用的普及，现在越来越多的服务器配置了大容量内存，拿DELL的R620来说在配置双路CPU下，其24个内存插槽，支持的内存高达960GB。对于ECC,REG这些带有纠错功能的内存故障检测是一件很头疼的事情，出现故障，还是可以连续运行几个月甚至几年，但如果运气不好，随时都会挂掉，好在linux中提供了一个edac-utils 内存纠错诊断工具，可以用来检查服务器内存潜在的故障。
下面以CentOS为例，介绍下edac-utils 工具的使用.
在使用edac-utils 工具之前，需要先了解服务器的硬件架构，以DELL R620为例，(其它如HP DL360P G8，IBM X3650 M4 机型都使用了 E5-2600 系列CPU，C600 系列芯片组.大致相同) 其CPU内存控制器对应通道，内存槽关系，如下所示。

处理器0 (对应一个内存控制器)
通道0：内存插槽A1、A5 和A9
通道1：内存插槽A2、A6 和A10
通道2：内存插槽A3、A7 和A11
通道3：内存插槽A4、A8 和A12

处理器1 (对应一个内存控制器)
通道0：内存插槽B1、B5 和B9
通道1：内存插槽B2、B6 和B10
通道2：内存插槽B3、B7 和B11
通道3：内存插槽B4、B8 和B12

1.安装 edac-utils 工具

yum install -y libsysfs edac-utils
2.执行检测命令，可查看纠错提示如下

edac-util -v

mc0: csrow0: CPU_SrcID#0_Ha#0_Chan#0_DIMM#0: A1
mc0: csrow0: CPU_SrcID#0_Ha#0_Chan#1_DIMM#0: A2
mc0: csrow0: CPU_SrcID#0_Ha#0_Chan#2_DIMM#0: A3
mc0: csrow0: CPU_SrcID#0_Ha#0_Chan#3_DIMM#0: A4
mc0: csrow1: CPU_SrcID#0_Ha#0_Chan#0_DIMM#1: A5
mc0: csrow1: CPU_SrcID#0_Ha#0_Chan#1_DIMM#1: A6
mc0: csrow1: CPU_SrcID#0_Ha#0_Chan#2_DIMM#1: A7
mc0: csrow1: CPU_SrcID#0_Ha#0_Chan#3_DIMM#1: A8
mc0: csrow2: CPU_SrcID#0_Ha#0_Chan#0_DIMM#2: A9
mc0: csrow2: CPU_SrcID#0_Ha#0_Chan#1_DIMM#2: A10
mc0: csrow2: CPU_SrcID#0_Ha#0_Chan#2_DIMM#2: A11
mc0: csrow2: CPU_SrcID#0_Ha#0_Chan#3_DIMM#2: A12

mc1: csrow0: CPU_SrcID#1_Ha#0_Chan#0_DIMM#0: B1
mc1: csrow0: CPU_SrcID#1_Ha#0_Chan#1_DIMM#0: B2
mc1: csrow0: CPU_SrcID#1_Ha#0_Chan#2_DIMM#0: B3
mc1: csrow0: CPU_SrcID#1_Ha#0_Chan#3_DIMM#0: B4
mc1: csrow1: CPU_SrcID#1_Ha#0_Chan#0_DIMM#1: B5
mc1: csrow1: CPU_SrcID#1_Ha#0_Chan#1_DIMM#1: B6
mc1: csrow1: CPU_SrcID#1_Ha#0_Chan#2_DIMM#1: B7
mc1: csrow1: CPU_SrcID#1_Ha#0_Chan#3_DIMM#1: B8
mc1: csrow2: CPU_SrcID#1_Ha#0_Chan#0_DIMM#1: B9
mc1: csrow2: CPU_SrcID#1_Ha#0_Chan#1_DIMM#1: B10
mc1: csrow2: CPU_SrcID#1_Ha#0_Chan#2_DIMM#1: B11
mc1: csrow2: CPU_SrcID#1_Ha#0_Chan#3_DIMM#1: B12

其中 mc0 表示 表示内存控制器0, CPU_Src_ID#0表示源CPU0 , Channel#0 表示通道0
DIMM#0 标示内存槽0，Corrected Errors 代表已经纠错的次数，根据前面列出的CPU通
道和内存槽对应关系即可给edac-utils 返回的信息进行编号。
即可得出 A1槽 6312 次纠错，B1槽 6459次纠错，B3槽 535次纠错. 3条内存出现潜在故障，接下来联系供应商进行更换即可。

12条内存的对应关系
mc0: csrow0: CPU#0Channel#0_DIMM#0: A1
mc0: csrow0: CPU#0Channel#1_DIMM#0: A2
mc0: csrow0: CPU#0Channel#2_DIMM#0: A3
mc0: csrow1: CPU#0Channel#0_DIMM#1: A4
mc0: csrow1: CPU#0Channel#1_DIMM#1: A5
mc0: csrow1: CPU#0Channel#2_DIMM#1: A6

mc1: csrow0: CPU#1Channel#0_DIMM#0: B1
mc1: csrow0: CPU#1Channel#1_DIMM#0: B2
mc1: csrow0: CPU#1Channel#2_DIMM#0: B3
mc1: csrow1: CPU#1Channel#0_DIMM#1: B4
mc1: csrow1: CPU#1Channel#1_DIMM#1: B5
mc1: csrow1: CPU#1Channel#2_DIMM#1: B6

20条内存的对应关系
mc0: 0 Uncorrected Errors with no DIMM info
mc0: 0 Corrected Errors with no DIMM info
mc0: csrow0: 0 Uncorrected Errors
mc0: csrow0: CPU_SrcID#0_Ha#0_Chan#0_DIMM#0: 0 Corrected Errors A1
mc0: csrow0: CPU_SrcID#0_Ha#0_Chan#1_DIMM#0: 0 Corrected Errors B1
mc0: csrow0: CPU_SrcID#0_Ha#0_Chan#2_DIMM#0: 0 Corrected Errors C1
mc0: csrow0: CPU_SrcID#0_Ha#0_Chan#3_DIMM#0: 0 Corrected Errors D1
mc0: csrow1: 0 Uncorrected Errors
mc0: csrow1: CPU_SrcID#0_Ha#0_Chan#0_DIMM#1: 0 Corrected Errors A2
mc0: csrow1: CPU_SrcID#0_Ha#0_Chan#1_DIMM#1: 0 Corrected Errors B2
mc0: csrow1: CPU_SrcID#0_Ha#0_Chan#2_DIMM#1: 0 Corrected Errors C2
mc0: csrow1: CPU_SrcID#0_Ha#0_Chan#3_DIMM#1: 0 Corrected Errors D2
mc0: csrow2: 0 Uncorrected Errors
mc0: csrow2: CPU_SrcID#0_Ha#0_Chan#0_DIMM#2: 0 Corrected Errors A3
mc0: csrow2: CPU_SrcID#0_Ha#0_Chan#1_DIMM#2: 11 Corrected Errors B3
mc0: csrow2: CPU_SrcID#0_Ha#0_Chan#2_DIMM#2: 0 Corrected Errors C3
mc0: csrow2: CPU_SrcID#0_Ha#0_Chan#3_DIMM#2: 0 Corrected Errors D3
mc1: 0 Uncorrected Errors with no DIMM info
mc1: 0 Corrected Errors with no DIMM info
mc1: csrow0: 0 Uncorrected Errors
mc1: csrow0: CPU_SrcID#1_Ha#0_Chan#0_DIMM#0: 0 Corrected Errors 
mc1: csrow0: CPU_SrcID#1_Ha#0_Chan#1_DIMM#0: 0 Corrected Errors 
mc1: csrow0: CPU_SrcID#1_Ha#0_Chan#2_DIMM#0: 0 Corrected Errors
mc1: csrow0: CPU_SrcID#1_Ha#0_Chan#3_DIMM#0: 0 Corrected Errors
mc1: csrow1: 0 Uncorrected Errors
mc1: csrow1: CPU_SrcID#1_Ha#0_Chan#0_DIMM#1: 0 Corrected Errors
mc1: csrow1: CPU_SrcID#1_Ha#0_Chan#1_DIMM#1: 0 Corrected Errors
mc1: csrow1: CPU_SrcID#1_Ha#0_Chan#2_DIMM#1: 0 Corrected Errors
mc1: csrow1: CPU_SrcID#1_Ha#0_Chan#3_DIMM#1: 0 Corrected Errors

4x16关系
mc0: csrow0: CPU#0Channel#0_DIMM#0: 0 Corrected Errors 8a
mc0: csrow0: CPU#0Channel#1_DIMM#0: 0 Corrected Errors 5b
mc0: csrow0: CPU#0Channel#2_DIMM#0: 0 Corrected Errors 2c
mc0: csrow1: 0 Uncorrected Errors
mc0: csrow1: CPU#0Channel#0_DIMM#1: 1 Corrected Errors 7d
mc0: csrow1: CPU#0Channel#1_DIMM#1: 0 Corrected Errors 4e
mc0: csrow1: CPU#0Channel#2_DIMM#1: 0 Corrected Errors 1f
mc0: csrow2: 0 Uncorrected Errors
mc0: csrow2: CPU#0Channel#0_DIMM#2: 0 Corrected Errors 6G
mc0: csrow2: CPU#0Channel#1_DIMM#2: 0 Corrected Errors 3h