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NVME-cached HDD and alternating high io wait
I am testing backups with a @NovaCloudHosting storage VPS from the Halloween offer, and I noticed that the io wait got from 0 up to almost 100% at intervals of less than a minute, and stays high for several seconds, then drops again to a very low figure. AFAIK the HDDs on these VPS are NVME-cached. Can that explain it?
Comments
Anyone?
Most likely another user doing write intensive tasks (i.e. database backups).
I just ran another full backup to test things out, and it went really well. Every now and then the iowait spiked for a short time, but most of the time it stayed low, and the backup completed super fast this time. Right now I'm testing a restore, and it's going at over 100 MB/sec, which is great! So it seems like the issue was just noisy neighbors, like you said. I'm keeping my fingers crossed that things stay this good most of the time, because I'd really like to stick with this VPS.
Because hard disks are so slow today. NVMe cache helps, but not always.