Warren Young wrote:
On Nov 18, 2015, at 1:01 PM, John R Pierce pierce@hogranch.com wrote:
On 11/18/2015 11:55 AM, Warren Young wrote:
It’s rather annoying to buy a NAS, then later realize you need to buy*another* NAS as a mirror in case the first one roaches itself. Isn’t that what redundant storage is supposed to avoid?
no, RAID is purely availability when faced with single or double drive failure, nothing else. classic raid is most certainly NOT about data integrity, as the raid stripes aren't checksummed, they assume hardware data integrity.
I knew I’d get some kind of lecture like that.
Look, I know RAID/ZFS is not a backup. My point is simply that if you need to keep a mirror of your file server just in case it roaches itself, what you have there is dual redundancy, not a backup. You need an offline backup *on top* of that, for the same reason that all hot mirrors are not backups.
<smip> Which is why, for home, I went to MicroCenter and bought, for about $30 USD, a hot swap drive bay that fits in my mid-sized tower, and a 2TB drive. Doesn't even need a sled....
mark