本文详细介绍了iSCSI启动器登录过程中的关键步骤：从iscsid登录并建立连接到内核iSCSI驱动程序开始，创建块设备节点并通知udev；udev组成uevent并发送给multipathd；multipathd利用libdevmapper创建dm设备；devicemapper创建dm设备并向udev发送通知；最后，udev创建各种链接。
some work done after iscsi initiator login
1. iscsid -> login, establish connection, hand it to kernel iscsi driver
2. iscsi driver -> create /dev/<sdX> iscsi block device node, and send notification to udev
3. udevd -> compose an uevent and send it to multipathd
4. multipathd -> use libdevmapper to create dm device if all paths has been connected
5. device mapper -> create dm-X device and sent notification to udev
6. udevd -> create various links (/dev/mapper/<wwid>) according to dm udev rules upon receiving the event.
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