Good grief.
Talk of rsync backups on live DB systems. zfs. On the fly disk encryprion.
All I can think of is, clearly these guys never worked with spinning disks and large datasets.
So much headroom to waste with SSDs, people are spoiled today.
Talk of rsync backups on live DB systems. zfs. On the fly disk encryprion.
All I can think of is, clearly these guys never worked with spinning disks and large datasets.
So much headroom to waste with SSDs, people are spoiled today.
It all depends upon how much headroom you have, the type of io activity, etc. I've operated systems under consistent 80% io load with massive datasets at the time, under spinning disks.
Running rsync would be madness on such a system. I know. I only did it once.
As well, ionice doesn't help with this degree of load.
They’re doing it correctly and would still be doing it correctly if they were on spinning disks. ZFS is designed exactly for these types of operations.
Over the years, I've run comparatively larger datasets, on significantly less hardware.
edit:
When I switched to SSDs for the first time, to give you a performance example, on some read queries I saw a 1000x to 10000x speed improvement.
This of course was on a read only secondary, long running reporting queries, no one runs queries of that nature on a primary.
SSD were an insane game changer.