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

To: "xen-api@xxxxxxxxxxxxxxxxxxx" <xen-api@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-API] SCSI ioctl in blktap, blktap2 and lvm
From: George Shuklin <george.shuklin@xxxxxxxxx>
Date: Sat, 28 May 2011 01:57:57 +0400
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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?


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