Hi George, XCP just uses shared LVM over iSCSI as a generic block device. This is only safe because (i) we modified LVM to run in a "read-only" mode on slaves; and (ii) we co-ordinate all LVM metadata updates across the pool in the XCP storage layer.
Cheers, Dave > -----Original Message----- > From: [email protected] [mailto:xen-api- > [email protected]] On Behalf Of George Shuklin > Sent: 19 July 2011 11:58 > To: [email protected] > Subject: [Xen-API] SG_IO for iscsi targets in XCP > > Good day. > > I'm researching if XCP by anyway is issuing some SCSI commands like > reservation or persistent reservation. I done 'greping' via source code > for SG_IO ioctl() and found just few innocent inquiry/id requests. > > Just to be sure: Is any SCSI-specific features used in XCP for cluster > management or resource locking? Or iscsi used only as generic block > device with LVM? > > Thanks. > > > _______________________________________________ > xen-api mailing list > [email protected] > http://lists.xensource.com/mailman/listinfo/xen-api
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