On 2016-09-22 9:38 am, Slawa Olhovchenkov wrote:
On Thu, Sep 22, 2016 at 04:56:53PM +0500, Eugene M. Zheganin wrote:


I should mention from the start that this is a question about an
engineering task, not a question about FreeBSD issue.

I have a set of zvol clones that I redistribute over iSCSI. Several
Windows VMs use these clones as disks via their embedded iSCSI
initiators (each clone represents a disk with an NTFS partition, is
imported as a "foreign" disk and functions just fine). From my opinion,
they should not have any need to do additional writes on these clones
(each VM should only read data, from my point of view). But zfs shows
they do, and sometimes they write a lot of data, so clearly facts and
expactations differ a lot - obviously I didn't take something into

May be atime like on NTFS?


I would recommend using the windows Diskpart command and settings the volumes attribute to read only, this will force the NTFS volume to be readonly and shouldn't allow changes to be saved.

   Dean E. Weimer
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