[CentOS] OT: Replacing Venerable NAS

Warren Young wrote:
> On Nov 18, 2015, at 1:01 PM, John R Pierce <pierce at 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