zhenwei pi 45b274aec8 iscsi-md5sum: Add new tool ...

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>

2023-07-31 15:29:11 +08:00

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