This may be considered NOTABUG, but in conjunction with #1123940 it's rather annoying, so I thought I'd mention it.
Say I have a storage pool /share/data/isos . Due to #1123940 it's not being started on boot, but I've forgotten about #1123940 again and I usually actually attach ISOs to VMs by browsing anyway. So I open the VM in virt-manager, click on the CD drive, click Connect, browse to /share/data/isos/foo.iso , click Open, and everything looks fine. Click OK, and I get:
Invalid Media Path
Could not define storage pool: operation failed: Storage source conflict with pool: 'isos'
Grr. I have to go start the pool manually before I can attach the image. Annoying, like I said.
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F23 virt-manager will start the pool in this case, rather than hit this collision.