45b274aec8
The new tool 'iscsi-md5sum' is used to calculate MD5 value of an iSCSI target. This help users to verify data at range [LBA, Length). For example, double-write on a RAID1 of 2 iSCSI targets, a daemon process runs iscsi-md5sum to check data periodically. Originally, we have to use several steps to achieve: 1, use iscsiadm to login.(root privilege required) 2, use dd(dd if=/dev/sdX of=/TMPPATH bs=4k count=LENGTH skip=LBA) to dump data. (root privilege required, additional disk space required) 3, use md5sum to calculate MD5 value 4, remove data. Instead, a single command iscsi-md5sum without root privilege is enough. Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>