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Aren't the parity blocks distributed across the disks in raidz2? So resilvering/rebuilding already takes advantage of reading from all the disks? If so what's t
by Naac 6y ago
Aren't the parity blocks distributed across the disks in raidz2? So resilvering/rebuilding already takes advantage of reading from all the disks? If so what's the different between that and dRAID?
- diegocg 6y agoIt's not about parity The essence of draid is that, instead of keeping a spare drive unused in case one of the working drives fail, it incorporates the spare drive to the array and uses it, but one drive worth of free space is reserved randomly across the entire array. That way, if one disk fails, the reserved space is used to write the data necessary to keep the array consistent. Because the free space is distributed randomly across the array, the write performance of a single drive doesn't become a bottleneck.
- Naac 6y agoSo if my understanding is correct this is orthogonal to the raidz type one is using? For example I can have a hot spare with a dRAID setup as part of my raidz2 pool?
- louwrentius 6y agoThis is exactly how most ‘old-school’ enterprise storage solutions work.