Help, my disk array has one dead member

[Kevin O'Gorman]

OP with his last word.

Thanks for all the ideas.  Some I didn't know about.  Some I did but you
connected dots for me that I hadn't put together.

Special thanks to Karl for the link to RAID tutorial.  I didn't know that 3
drives is enough for redundancy;  I thought it was 4.  I may switch to
RAID-5 as it is starting to look like I don't need 11 TiB, but that 7 would
do nicely.

I've recovered the main database to where it was when raid failed.   The
rest of the files are either scripts or mostly of historical significance
(actually, they are just symptoms that show I'm a data packrat).  And I
seem to have (or have recovered) all of the scripts I use very much.  So
that machine is back to running (in a very restricted partition for now).
The other machine will be building a new RAID array and doing a few tests
on the drives from the old RAID.  By next week, I'll be re-ordering drives
for my second (or is it third?) RAID array.


On Thu, Mar 23, 2017 at 5:49 AM, Bruce Ferrell <bferrell at baywinds.org>
wrote:

> On 03/23/2017 02:11 AM, Liam Proven wrote:
>
>> On 22 March 2017 at 22:36, Bruce Ferrell <bferrell at baywinds.org> wrote:
>>
>>> it's either needless (this is why we use a RAID)
>>>
>>
>> WHAT?!
>>
>> The #1 thing that any competent storage admin will tell you, or any
>> guide book, is this:
>>
>> *RAID is not a replacement for backups.*
>>
>> Yes you still need to copy the stuff off it. If the user has never
>> done a disk swap before and switches the wrong disk or something, all
>> data will be lost. If the problem is not just a failing disk, all data
>> will be lost. If there are issues with controller, cabling, filesystem
>> corruption, anything except a failed disk, data will be lost.
>>
>> This is terrible, awful advice.
>>
>>
>>
>> RADI is not
>>
> I was talking about in the context of disaster recovery.
> Not overall storage management.
> When I'me cleaning up from a failed disk, one must perform triage.
>
> 1.) priority is recover the operation.
> 2.) is everything else
>
> if you try to do everything all at once, y'all got a good change of losing
> everything
>
> Of course purists everywhere will armchair quarterback anyway
>
>
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-- 
Kevin O'Gorman
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