From: steveo@eircom.net   
      
   On Sun, 21 Jul 2024 10:44:03 +0100   
   The Natural Philosopher  wrote:   
      
   > Oh indeed. My new server will feature two SMART enabled SSDs...one a   
   > mirror of the other.   
   > I am not interested in RAID. RAID increases availability, but does not   
   > archive data   
      
   	You have a mirror - that's RAID. RAID is about smoothly surviving   
   drive failures. With any storage system there are two important factors -   
   mean time to data loss and probability of data unavailability.   
      
   	My NAS has two mirrored 1TB NVMe SSDs and two 10TB mirrored hard   
   discs holding ZFS filesystems with regular snapshots enabled - the archive   
   server has four 4TB hard discs in a ZFS RAIDZ1 (FEC RAID with 3 data and 1   
   parity) - it's also in a different building. There is a continuous cycle to   
   the archive server keeping the archive up to date within a minute or two.   
      
   	End result   
   	- Fast and slow (relatively) stores   
   	- Snapshots for protection against silliness or corruption   
   	- RAID for protection against drive failure   
   	- Archive for protection against machine/building loss   
      
   	According to an MTTDL calculator I found once (no idea how   
   trustworthy it is) I should be good for about a century.   
      
   --   
   Steve O'Hara-Smith   
   Odds and Ends at http://www.sohara.org/   
   For forms of government let fools contest   
   Whate're is best administered is best - Alexander Pope   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)