GitHub user nickaccuweb added a comment to the discussion: iSCSI overlay for 
Primera / Alletra Storage MP on CloudStack 4.22.1.1 KVM

@dahampere 

Thank you for sharing the details.

I reviewed the overlay, and it appears relevant for CloudStack environments 
where Primera / Alletra storage is connected to KVM hosts through iSCSI instead 
of Fibre Channel.

The issue is that the default KVM storage scripts mainly rescan Fibre Channel 
paths, so an iSCSI-presented LUN may not be detected correctly. The overlay 
changes the discovery process to use the existing iSCSI sessions and also 
avoids disconnecting the shared iSCSI target during volume detach.

Since this is a third-party overlay and not an official CloudStack release, I 
recommend testing it first before applying it in production.

Please share the following so we can confirm whether it matches your 
environment:

- Exact CloudStack version
- KVM host OS
- Storage model
- Whether the hosts are using iSCSI only
- Current primary storage provider configuration
- Related management-server and KVM agent errors

Once I have these details, I can review the safest next step.

GitHub link: 
https://github.com/apache/cloudstack/discussions/14032#discussioncomment-18593918

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