Re: USB chasis fails, fate of the software raid?

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On Wed, 2017-10-18 at 22:28 +0200, Rudy Zijlstra wrote:
> Hi David,
> 
> 

Hi Rudy,

> Op 18/10/2017 om 21:04 schreef dfc:
> > I have an Orico (3559SUSJ3) external 5 bay
> > hard disk drive enclosure attached via
> > USB to my desktop computer.
> 
> USB is indeed not the best choice.
> 
> > It holds 5 * 4 TB disks in raid5 and
> > has functioned for a couple of years.
> 
> <snip>
> > My main question is whether inserting
> > the 5 disks into another JBOD chasis
> > is likely to work?
> 
> Yes, this should work. With a little luck you would not even need to 
> force it, as with a component failure all disks should have lost 
> connection at the same time.
> The biggest risk is that the failure caused spikes before final
> death, 
> causing damage on the HDD. But without knowing the actual failure
> that 
> is pure conjecture.
> You could test each disk separately -- as long as you only read from 
> them. Only reading is to ensure that no changes are done that make
> later 

Thanks, I will try reading disks and then install in a new
chasis.

> re-build of the raid difficult.
> > In particular is
> > mdadm "smart enough" to find all
> > the components and/or do I need to do
> > something to help it along? In fact,
> > our IT person has suggested that the
> > data may well be lost.
> 
> Your IT person apparently either thinks the HW failure caused
> extensive 
> damage, or wants you to do something different, or... is not very 
> knowledgeable about this type of setup.
> 
> <snip>
> > Also, since I first used the JBOD with software
> > raid I came to realize that the usb connection
> > is not a good choice (though I have never had
> > problems). What sort of connection (at the low
> > price end of the market for HDD enclosures)
> > would be better? eSata or something else?
> 
> eSATA would work. But depends on the type of enclusure you can get.
> I 
> leave that to people based in USA, who know what is available there.
> 
> Cheers
> 
> Rudy
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