[Xen-API] SCSI ioctl in blktap, blktap2 and lvm

[George Shuklin <george.shuklin@xxxxxxxxx>]

Good day.

Right now I have discussion in ietd maillist about possibility to build 
following configuration:

DriveA ---- DRBD ----iet - - - - -iscsi-initiator --\
                     |                               +multipath --- 
LVMoISCSI --- blktap(2) --- virtual machine(s)
DriveB----- DRBD-----iet - - - - -iscsi-initiator --/

I hope, you can see  XCP part here (iscsi initiator, multipath, lvm and 
so on). Guys in ietd maillist says that if DRBD will be in 
primary/primary mode any statefull SCSI command will trash data beyond 
repair level.
Question is: Is XCP components (LVM, blktap and etc) use any statefull 
operation like SCSI reservation and task management?

Thanks.

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