/var/log/messages 出現(xiàn)多路徑出錯(cuò)問題解決：
原因?yàn)樵谂渲肐SCSI 時(shí)，使用了兩條無效路徑，看到在進(jìn)行存儲(chǔ)器分區(qū)時(shí)，每一個(gè)LUN 磁盤，只能指定一個(gè)控制器，
一個(gè)控制器，只有兩條線路，只能用到兩條，另一個(gè)控制器的兩條，是無法訪問的。這個(gè)問題暫時(shí)不知怎么解決。先用兩條吧。如果有哪們知道，
請(qǐng)指點(diǎn)。


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???????????????????????? [確定]
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:???????????????????????????????????? [確定]
?????????????????????????????????????????????????????????? [確定]
設(shè)置 iSCSI 目標(biāo)：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.
?????????????????????????????????????????????????????????? [確定]
[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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