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

[Dave Scott <Dave.Scott@xxxxxxxxxxxxx>]

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: xen-api-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-api-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of George Shuklin
> Sent: 19 July 2011 11:58
> To: xen-api@xxxxxxxxxxxxxxxxxxx
> 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.
> 
> 
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