george.shuklin at gmail
Jul 19, 2011, 5:33 AM
Post #3 of 3
Thank you very much.
I feel more safe now with dual primary DRBD configuration. I'll report
results of practical deployment with real-life load later.
В Втр, 19/07/2011 в 12:21 +0100, Dave Scott пишет:
> 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.
> > 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?
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