Q1: Can I disable the auto-scan completely for a single SR?
That particular SR only contains block devices (disks) that I pass through directly to VMs. Those disks are > 2 TB and I'd love to put in standby when they are not in use. One of them is only used as a backup target within that VM and I've created a service that runs hdparm -S 150 /dev/sdc in Dom0. Putting the disk in standby works, but the rescan wakes up that disk.
Q2: If I can't disable rescans ofr individual SRs. Can I set the rescan interval to 86400 (once per day) on the whole host. Is there any negative effect in a homelab setting?
Q3: Does a manual "Rescan" on the SR trigger the same cleanup jobs (e.g. coalesce of snapshots), that the periodic scan does?
@tjkreidl
If each CR backup is now created as a snapshot, instead of a new VM, and the alert triggers after a VM has more than three snapshots, this logically means that the alert will trigger if the CR has a retention value greater than 3.
Have I misunderstood how the CR backup process works?
Different use cases: Ceph is better with more hosts (at least 6 or 7 minimum) while XOSTOR is better between 3 to 7/8.
We might have better Ceph support in the future for large clusters.
