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From: -hh <recscuba_google@huntzinger.com>
Newsgroups: comp.os.linux.advocacy
Subject: Re: My First HDD Failure (I Think)
Date: Wed, 27 Nov 2024 06:46:51 -0500
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On 11/27/24 3:15 AM, Physfitfreak wrote:
> On 11/26/24 2:29 AM, Farley Flud wrote:
>> On Mon, 25 Nov 2024 17:33:49 -0600, Physfitfreak wrote:
>>
>>>
>>> So does one modify the backup every day, at the end of each day? Then
>>> you're endangering your back up cause you're messing with it too often
>>> and it may crash one day. It will in fact.
>>>
>>> To get around that, you'd have to do entire back ups everyday, each on a
>>> new media, and never touch them unless you have to. Putting these entire
>>> backups on the same media is still dangerous.
>>>
>>> I bet this is what those who are serious about it do. They have the
>>> money and they have the men to spend hours each day backing up data,
>>> perhaps even creating multiple copies on different media in case
>>> something happens to one of them.
>>>
>>
>> Then you have to go the high end RAID route, just like vallor described
>> in one of his posts.
>>
>> With a 22T drive RAID you can backup continuously.
> 
> 
> I understood that what he offered took care of speed and volume nicely, 
> but not the safety. I could not make sure each backup is placed on a new 
> media or each disk there contains more than one backup.  

Depends on how one configures.

Scott's was  eight (8) spindles of 22TB drives in that NAS so they could 
be organized as anything from one JBOD to eight (8) individual drives.

Plus there's RAID options: two (2) RAID5 arrays from 4 disks each; ~66TB 
each (~132TB total), tolerant of one disk failure.  Or an 8 disk RAID6: 
same ~132TB total size but now spanned, & tolerant of two disk failures. 
  Plus many others (4 RAID1's of 22TB each = 88TB total), etc.


> If a disk, any 
> disk, is accessed all the time, it will crash one day.

Sure, but HDD reliability has gotten pretty good.  This comment prompted 
me to go look on one of my systems ... I found that its been online and 
running 24/7 since 31 March 2016 = 8.6 years (so far) & counting.


-hh