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RE: [Xen-API] SG_IO for iscsi targets in XCP
| To: | Dave Scott <Dave.Scott@xxxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-API] SG_IO for iscsi targets in XCP |
| From: | George Shuklin <george.shuklin@xxxxxxxxx> |
| Date: | Tue, 19 Jul 2011 16:33:42 +0400 |
| Cc: | "xen-api@xxxxxxxxxxxxxxxxxxx" <xen-api@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 19 Jul 2011 05:34:19 -0700 |
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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? _______________________________________________ xen-api mailing list xen-api@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/mailman/listinfo/xen-api |
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