Issues about iSCSI storage pool

[YuXinHuo]

1. I can create 2 templates with the same volume of iSCSI storage pool.
2. I can create 2 guests with the same template configured against a volume of iSCSI storage pool.

I think both the design and implementation have problems

1. For template, as it need to be used to create multiple guests, resources there must be collection like network/storage pool, should not be a volume.
2. As volume need to support both read/write, we need to avoid 2 guests use the same volume as boot disk.

Recommended design:

1. In template, when edit, only list storage pool, remove iscsi pool volumes there.
2. When create guest, once user selected the template, if it is iscsi, add a section with a dropdown list for user to select volume, for volume already in use, filter them out.

[wenwang1989]

Aggreed.

[alinefm]

We can continue setting a iSCSI volume on templates but we need to make it shareable so multiple VMs can work with it without problems.

To share a disk, we just need to add the tag in the disk XML.

For reference: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Virtualization/sect-Virtualization-Shared_storage_and_virtualization-Using_iSCSI_for_storing_virtual_disk_images.html