[PLUG] USB enclosures

[Denis Heidtmann]

John,

Both your main storage and your backup run from the same power line in the
same house.  What is the likelihood lightning or some other major event
could affect both at the same time?  Low, but backups are intended as
insurance for low-likelihood events.  Then there is crypto-lock.  I do not
know about how that works and how different backup schemes protect against
it.

I cannot say I have anything as robust as your system--I backup to a local
disk once per week, real time while I am sitting here.  Other times the
local backup disk is powered off.

-Denis

On Tue, Apr 4, 2017 at 6:15 PM, John Jason Jordan <johnxj at gmx.com> wrote:

> On Tue, 04 Apr 2017 16:55:00 -0700
> Tom <tomas.kuchta.lists at gmail.com> dijo:
>
> >I understand that you are choosing RAID0 because you need 8+8=16GB of
> >storage space instead of redundancy.
> >I would advise you against using RAID0 if you care about your data -
> >single disk failure and you loose everything.
> >JBOD will give you the same storage space at about the same performance
> >over 1Gb/s ethernet + you are only risking some of the data, depending
> >which disk fails. So, JBOD is lower risk at almost no tradeoff versus
> >not-redundant RAID0 over 1Gb/s network.
> >RAID0 is really only useful for performance reasons as locally
> >connected storage inside a workstation - it doubles the disk speed.
> >That being said, local SSD/NVME will beat 2 disk HDD RAID0 in common
> >desktop/media/engineering workloads.
>
> Hmm. Interesting thoughts.
>
> You are correct that I chose Raid 0 because I want 16TB of storage
> space. It s also true that speed is not a critical consideration to me
> for this setup, that is, the speed of the main storage on the USB is
> important, but not the speed of the main storage to the Synology
> because that is just backup. I don't care how long the backups take
> because they run at 2am every night.
>
> It is certainly true that JBOD is lower risk because you probably
> wouldn't lose both disks, but this is backup storage. The main storage
> would be unlikely to be affected at the same time as a disk failure in
> the backup storage. So if I lose the whole backup, I replace the disks,
> and make a new backup from the main storage onto the new disks -
> nothing lost. And even if one disk in the backup Raid is still good,
> I'd replace it anyway, because the disks were purchased and installed
> at the same time, so if one goes, the other is probably not far behind.
> In fact, even if neither fails, when they get to the end of their
> warranty I'd probably replace both anyway. I'd rather keep things from
> failing than have to repair stuff under emergency conditions.
>
> JBOD might be a trifle safer, but I still have the main storage and I'd
> replace both disks anyway, so this benefit seems negligible to me. Raid
> 0 is probably faster, but that is also of negligible value to me. It's
> a tossup.
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