I'm expanding a pool that consists of a single a 2-drive mirror vdev by successive replacement of the drives with larger sizes (14 TB to 20 TB). The existing pool is about 70% full. I've done it before and it worked without any issue but that was going from 4 TB drives that were 10% full to the 14TB drives and it only took a few minutes. I knew this one would take a lot longer because there was much more data to copy so I wasn't surprised when the initial estimate was 24 hours dropping to 12 hours once it had run for a few minutes. It's now 10 hours later and the estimated time has slipped a couple of hours about 15 hours but nothing appears wrong so I'm not concerned that it's not going to finish.
However, I was curious about the slippage since it seems like it should be pretty much a straight copy. Not having anything better to do, I looked at some performance graphs and noticed that there have been a couple of long period where disk I/O performance dropped by 90% which seems odd. I'd turned off all the data protection tasks and there really isn't much load on the server. All the disk and CPU load/temperatures look fine. There is one application running (Proxmox Backup Server) but it's not doing much at the moment other than occasional backups of some small Proxmox VMs/LXCs)
It's a Terramaster 2-bay NAS that I upgrade with 33GB RAM running 22.12.4.2
Any ideas?
However, I was curious about the slippage since it seems like it should be pretty much a straight copy. Not having anything better to do, I looked at some performance graphs and noticed that there have been a couple of long period where disk I/O performance dropped by 90% which seems odd. I'd turned off all the data protection tasks and there really isn't much load on the server. All the disk and CPU load/temperatures look fine. There is one application running (Proxmox Backup Server) but it's not doing much at the moment other than occasional backups of some small Proxmox VMs/LXCs)
It's a Terramaster 2-bay NAS that I upgrade with 33GB RAM running 22.12.4.2
Any ideas?