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Subject: "RE: DROBO SUCKS" Previous topic | Next topic
blw Moderator Awarded for his high level of expertise in various areas Nikonian since 18th Jun 2004Sat 15-Dec-12 08:52 PM
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#6. "RE: DROBO SUCKS"
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Richmond, US
          

Without addressing the drobo, since I have zero experience with it, I will say that not backing up your data is a serious error, even with a perfect RAID implementation. (A point of reference: my day job is building a RAID NAS device, one of the big ones like what Jon mentioned, where loss of data is not realistic.) That's because RAID protects you against one kind of problem, but there are many other types. The most obvious example is that the RAID can protect you from a disk drive failure (or possibly two, if you're paranoid and willing to invest). But if you have a different type of problem, for example you delete the wrong file, the RAID system obediently deletes what amount to all of the copies - as quickly as possible. And you have no method of recovery. Other forms of this class of error are an OS or application bug, etc.

The way the mission critical businesses do things can be scaled down to folks like us:

- first, have your primary copy protected by RAID. That could be a mirror (RAID-1) or something more complex.

- next, make copies of your data occasionally. Ideally those are "snapshots" or "point-in-time copies" provided by your RAID or your operating system, but they could be DVDs or even other hard disks. This is crucial to protecting against the errors noted above.

- If you've done this much, you are still subject to certain types of disasters, for example if there's a fire in your office, chances are pretty good that either the heat or the firefighting methods will destroy all of the HDD, RAID and very possibly all of the copies.

- To get around this, the big businesses replicate their RAID volumes to another location, a "considerable" distance away. The NYC banks, for example, mostly replicate further away than NYC and often much further - one that I have worked with extensively has a backup data center in Nebraska, and others go across the Atlantic.

- Fortunately they also had off-site copies, meaning in that particular case magnetic tape stored literally under a mountain many miles away. We can simulate this by having a couple of HDD that get a copy, say, every week from the main RAID system, and then they are taken home or to the safe deposit box at the bank, etc. With two of them you can always have one at the bank even while you're loading up the other one.

So there you have it - four HDD and some software. Two in a mirror on your primary system. An offsite copy, possibly one that includes periodic snapshots, and another one that is in rotation with the offsite.

------

As far as your current predicament, there are services that specialize in recovering things like this. If Drobo themselves do not offer something like this (if it's their bug they ought to do something for you), there are plenty of others who do. They can usually recover stuff even from disk platters that are physically damaged, although there's a limit to that. (And there's a price, too.) I've seen data recovered from a disk that had a completely dead embedded controller (meaning the circuits glued to the bottom of the disk drive) - it did not even spin up. When they had the platters grafted onto a substitute controller, they discovered that there had also been a "head surface interaction" - what we more descriptively call "a head crash" in which the read/write heads physically land on and damage the recording surface on the platters. These folks were desperate, so they had their service recover all of the data that was actually on the HDD surfaces. They got something like 98% back, the lost parts being what was under the head crash. Clearly you should not have to go this far.

My guess is that if you haven't done too much to the remaining components, it's probably fairly straightforward for some expert to go in and liberate most of the data. I'd guess that it would cost $500-$2000 depending on just what went wrong. Quite a bit for an amateur and not really so bad for, say, a professional photographer.

_____
Brian... a bicoastal Nikonian and Team Member

My gallery is online. Comments and critique welcomed any time!

  

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This is a hot, active topic!DROBO STINKS [View all] , mdonovan Gold Member, Fri 14-Dec-12 11:45 PM
 
Subject Author Message Date ID
Reply message RE: DROBO SUCKS
JonK Moderator
15th Dec 2012
1
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mdonovan Gold Member
15th Dec 2012
2
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JonK Moderator
15th Dec 2012
3
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kj_fi Silver Member
15th Dec 2012
5
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esantos Moderator
15th Dec 2012
4
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blw Moderator
15th Dec 2012
6
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mdonovan Gold Member
16th Dec 2012
7
Reply message RE: DROBO SUCKS
jordivb Silver Member
16th Dec 2012
8
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d1sahib
22nd Dec 2012
9
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david_mathre Platinum Member
23rd Dec 2012
10
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mdonovan Gold Member
24th Dec 2012
11
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JonK Moderator
24th Dec 2012
12
     Reply message RE: DROBO SUCKS
mdonovan Gold Member
24th Dec 2012
13
     Reply message RE: DROBO SUCKS
KolinP Silver Member
27th Dec 2012
14
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sabbey51 Silver Member
27th Dec 2012
15
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pqtrths Silver Member
24th Apr 2013
29
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nrothschild Silver Member
28th Dec 2012
16
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JonK Moderator
28th Dec 2012
17
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nrothschild Silver Member
28th Dec 2012
18
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JonK Moderator
28th Dec 2012
19
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nrothschild Silver Member
28th Dec 2012
20
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david_mathre Platinum Member
28th Dec 2012
21
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nrothschild Silver Member
28th Dec 2012
22
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mdonovan Gold Member
12th Jan 2013
23
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tmartin67
03rd Feb 2013
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mdonovan Gold Member
06th Feb 2013
25
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blossombogart Silver Member
19th Mar 2013
26
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Pdavid2 Silver Member
08th Apr 2013
27
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Aubrey Silver Member
24th Apr 2013
28
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robsb Platinum Member
09th May 2013
30
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JSG1967 Silver Member
21st Jun 2013
31
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Wolphin Silver Member
08th Jul 2013
32
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Aubrey Silver Member
09th Jul 2013
33
     Reply message RE: DROBO STINKS
Wolphin Silver Member
09th Jul 2013
34
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RudyH Gold Member
23rd Jul 2013
35
Reply message RE: Use RAID 1
westcoast Silver Member
06th Oct 2013
36
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kholt Silver Member
13th Nov 2013
37
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robsb Platinum Member
31st Dec 2013
38

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