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Would it be fair to say that "preventing data loss", broadly speaking, requires defense in depth, and that RAID alone is not sufficient? If so, then both thing
by zdragnar 3y ago
Would it be fair to say that "preventing data loss", broadly speaking, requires defense in depth, and that RAID alone is not sufficient?
If so, then both things in the gp are true: raid isn't enough, and can be a false sense of security.
- dijit 3y agoGiven the context, why would raid and hdfs not be equivalent?
- ianburrell 3y agoRAID is distributed across drives on one machine. That whole machine can fail. Plus, it can take a while to recover the machine or array and it is common for another drive to fail during recovery. HDFS is distributed across multiple machines, each one which can have RAID. It is unlikely that enough machines will fail to lose data.
- dijit 3y agoI believe that its essentially equivalent and neither raid nor hdfs are good enough to exist without backups.