标签：iscsi detected conn error (1011)
/var/log/messages的错误描述
Sep 14 04:02:58 kernel: connection4:0: detected conn error (1011)
Sep 14 04:02:59 iscsid: Kernel reported iSCSI connection 4:0 error (1011) state (3)
Sep 14 04:03:01 kernel: connection3:0: detected conn error (1011)
Sep 14 04:03:02 iscsid: Kernel reported iSCSI connection 3:0 error (1011) state (3)
Sep 14 04:03:02 kernel: connection1:0: detected conn error (1011)
Sep 14 04:03:02 kernel: connection8:0: detected conn error (1011)
Sep 14 04:03:02 kernel: connection2:0: detected conn error (1011)
Sep 14 04:03:02 kernel: connection5:0: detected conn error (1011)
Sep 14 04:03:03 iscsid: Kernel reported iSCSI connection 1:0 error (1011) state (3)
Sep 14 04:03:03 iscsid: Kernel reported iSCSI connection 8:0 error (1011) state (3)
Sep 14 04:03:03 iscsid: Kernel reported iSCSI connection 2:0 error (1011) state (3)
Sep 14 04:03:03 iscsid: Kernel reported iSCSI connection 5:0 error (1011) state (3)
Sep 14 04:03:04 iscsid: connection4:0 is operational after recovery (1 attempts)
Sep 14 04:03:08 iscsid: connection3:0 is operational after recovery (1 attempts)
Sep 14 04:03:08 iscsid: connection8:0 is operational after recovery (1 attempts)
Sep 14 04:03:08 iscsid: connection2:0 is operational after recovery (1 attempts)
Sep 14 04:03:08 iscsid: connection1:0 is operational after recovery (1 attempts)
Sep 14 04:03:08 iscsid: connection5:0 is operational after recovery (1 attempts)
解决方法：
用lsscsi命令查看错误的connection对应的disk （/dev/sdX）
[0:0:0:0] cd/dvd Optiarc DVD-ROM DDU820S MH52 /dev/scd0
[2:0:0:0] disk LEFTHAND iSCSIDisk 9500 /dev/sdj
[3:0:0:0] disk LEFTHAND iSCSIDisk 9500 /dev/sdk
再去iscsi存储查看每个volume的iscsi session
发现有问题的volume对应的iscsi session有两个或者在两个中间切换，说明有多于一个session尝试登入。
幸运的是，另一个session只是login，没有挂载，不然就有可能破坏这个disk。
找到另外那个session对应的服务器，登出iscsi，问题解决。
标签：iscsi detected conn error (1011)
原文地址：http://victorzhang.blog.51cto.com/9044706/1552810
