RE: [Xen-API] SG_IO for iscsi targets in XCP

[George Shuklin <george.shuklin@xxxxxxxxx>]

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.

Ð ÐÑÑ, 19/07/2011 Ð 12:21 +0100, Dave Scott ÐÐÑÐÑ:
> 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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