Actually, the question was solved, but as something ugly.
What mount did not want to mount iscsi in RW.
Just expand the "basic" information.
The fact that iscsi is already available. Ie, a disk (block device) was formatted to NTFS and filled.
It turns out that for some strange, yet to me reason that NTFS was plugging. Whether too much "disk", whether the stars have aligned, but mounted the device Read Only.
Was digging the repository on the topic of ntfs and... found the devils: ntfs-utils. Put, for informational purposes only. This package pulled a crazy number of extra packages for graphics, which I server never need. Was about to demolish, but decided to try again to premostiti device. Ops! Did it! Now in RW mode!
For a complete buzz I would like to understand why had this problem and how its solution helped the ntfs-utils? More precisely, what is it about this ntfs-utils allowed to mount in RW? Really want to delete this ntfs-utils and garbage bags, which he pulled behind him.