It’s not that long ago that Citrix has released version 6.1.0 for it’s XenServer product. Today they have released the first hotfix for this version.
This hotfix resolves the following issues:
After installing XenServer 6.1.0, multipathing will only use one path for Software iSCSI on arrays which contain the same IQN on multiple target portals. As a result, customers will see only one active path and will not successfully failover in the event of an infrastructure issue. This hotfix resolves this issue.
NOTE: Customers who are currently experiencing this problem should detach and re-attach the Storage Repositories (SRs) after applying the hotfix. However, customers who cannot detach and re-attach the SR, should refer to CTX135277 – Workaround for the Multipathing Behavior Change in XenServer 6.1.0 for a temporary workaround.
You can download the hotfix (and find installation instructions) here at the Citrix Knowledge Base.