alt Hacker NewsI would run 2 or more parity disks always. I have had disks fail and rebuilding with only one parity drive is scary (have seen rebuilds go bad because a second drive failed whilst rebuilding).
But agree about backups.
I would run 2 or more parity disks always. I have had disks fail and rebuilding with only one parity drive is scary (have seen rebuilds go bad because a second drive failed whilst rebuilding).
But agree about backups.
Were those arrays doing regular scrubs, so that they experience rebuild-equivalent load every month or two and it's not a sudden shock to them?
If your odds of disk failure in a rebuild are "only" 10x normal failure rate, and it takes a week, 5 disks will all survive that week 98% of the time. That's plenty for a NAS.