multipathd: sdn: readsector0 checker reports path is down 多路径出错问题解决

/var/log/messages 出现多路径出错问题解决：
原因为在配置ISCSI 时，使用了两条无效路径，看到在进行存储器分区时，每一个LUN 磁盘，只能指定一个控制器，
一个控制器，只有两条线路，只能用到两条，另一个控制器的两条，是无法访问的。这个问题暂时不知怎么解决。先用两条吧。如果有哪们知道，
请指点。

ar 17 14:12:00 rac2 multipathd: sdn: readsector0 checker reports path is down
Mar 17 14:12:02 rac2 multipathd: sds: readsector0 checker reports path is down
Mar 17 14:12:03 rac2 multipathd: sdr: readsector0 checker reports path is down
Mar 17 14:12:05 rac2 multipathd: sdt: readsector0 checker reports path is down
Mar 17 14:12:05 rac2 multipathd: sdu: readsector0 checker reports path is down
Mar 17 14:12:07 rac2 multipathd: sdc: readsector0 checker reports path is down

[root@rac2 ~]# iscsiadm -m node
192.168.10.11:3260,1 iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871
192.168.10.14:3260,2 iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871
192.168.10.13:3260,2 iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871
192.168.10.12:3260,1 iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871

[root@rac2 ~]# service iscsid stop [确定]
Stopping iSCSI daemon: iscsiadm: can not connect to iSCSI daemon (111)!
iscsiadm: initiator reported error (20 - could not connect to iscsid)
iscsiadm: Could not stop iscsid. Trying sending iscsid SIGTERM or SIGKILL signals manually

service iscsi stop
Logging out of session [sid: 10, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.14,3260]
Logging out of session [sid: 11, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.13,3260]
Logging out of session [sid: 12, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.12,3260]
Logging out of session [sid: 9, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.11,3260]
Logout of [sid: 10, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.14,3260] successful.
Logout of [sid: 11, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.13,3260] successful.
Logout of [sid: 12, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.12,3260] successful.
Logout of [sid: 9, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.11,3260] successful.
Stopping iSCSI daemon:
[root@rac2 ~]# iscsiadm -m node -o delete -T iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871 -p 192.168.10.13:3260
[root@rac2 ~]# iscsiadm -m node -o delete -T iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871 -p 192.168.10.14:3260
[root@rac2 ~]# service iscsi start
iscsid 已停
Starting iSCSI daemon:                                     [确定]
                                                           [确定]
设置 iSCSI 目标：Logging in to [iface: default, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.11,3260] (multiple)
Logging in to [iface: default, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.12,3260] (multiple)
Login to [iface: default, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.11,3260] successful.
Login to [iface: default, target: iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871, portal: 192.168.10.12,3260] successful.
                                                           [确定]
[root@rac2 ~]# iscsiadm -m node
192.168.10.11:3260,1 iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871
192.168.10.12:3260,1 iqn.1984-05.com.dell:powervault.md3600i.690b11c0002be7310000000051197871

[root@rac2 ~]# multipath -F
[root@rac2 ~]# multipath -ll
[root@rac2 ~]# multipath -v2
create: mpath4 (3690b11c0002be80e00000ce3514380db) DELL,MD36xxi
[size=4.1G][features=0][hwhandler=0][n/a]
\_ round-robin 0 [prio=1][undef]
\_ 19:0:0:0 sdb 8:16 [undef][ready]
\_ round-robin 0 [prio=1][undef]
\_ 20:0:0:0 sdc 8:32 [undef][ready]
create: mpath5 (3690b11c0002be80e00000ce5514380f8) DELL,MD36xxi
[size=1.0T][features=0][hwhandler=0][n/a]
\_ round-robin 0 [prio=1][undef]
\_ 19:0:0:1 sdd 8:48 [undef][ready]
\_ round-robin 0 [prio=1][undef]
\_ 20:0:0:1 sde 8:64 [undef][ready]
create: mpath6 (3690b11c0002be80e00000ce75143810c) DELL,MD36xxi
[size=1.0T][features=0][hwhandler=0][n/a]
\_ round-robin 0 [prio=1][undef]
\_ 19:0:0:2 sdf 8:80 [undef][ready]
\_ round-robin 0 [prio=1][undef]
\_ 20:0:0:2 sdh 8:112 [undef][ready]
create: mpath7 (3690b11c0002be80e00000ce95143811c) DELL,MD36xxi
[size=1.0T][features=0][hwhandler=0][n/a]
\_ round-robin 0 [prio=1][undef]
\_ 19:0:0:3 sdg 8:96 [undef][ready]
\_ round-robin 0 [prio=1][undef]
\_ 20:0:0:3 sdj 8:144 [undef][ready]
create: mpath8 (3690b11c0002be7310000099851438137) DELL,MD36xxi
[size=1018G][features=0][hwhandler=0][n/a]
\_ round-robin 0 [prio=1][undef]
\_ 19:0:0:4 sdi 8:128 [undef][ready]
\_ round-robin 0 [prio=1][undef]
\_ 20:0:0:4 sdl 8:176 [undef][ready]
create: mpath0 (3690b11c0002be731000001e6511978ba) DELL,Universal Xport
[size=20M][features=0][hwhandler=0][n/a]
\_ round-robin 0 [prio=1][undef]
\_ 19:0:0:31 sdk 8:160 [undef][ready]
\_ round-robin 0 [prio=1][undef]
\_ 20:0:0:31 sdm 8:192 [undef][ready]

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multipathd: sdn: readsector0 checker reports path is down 多路径出错问题解决

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