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From: Ron Johnson on 3 May 2010 22:10
On 05/03/2010 08:04 PM, Sam Leon wrote:
> Ron Johnson wrote:
>> On 05/02/2010 03:24 PM, Alexander Samad wrote:
>> [snip]
>>>
>>> My system used to become close to unusable on the 1st sunday of the
>>> month when
>>> mdadm did it resync,
>>
>> That sounds... wrong, on a jillion levels.
>>
>
> I would rather the array fail on a monthly resync than have it fail on a
> resync after replacing a drive and loose everything.
>

Arrays shouldn't fall out of sync, so a "monthly resync" *is* wrong
on a jillion levels.

Fortunately, as Martin Krafft pointed out, it's really a monthly
self-test, and -- to a Large Systems DBA -- that's OK.

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From: Hugo Vanwoerkom on 4 May 2010 12:10
Ron Johnson wrote:
> On 05/03/2010 03:45 AM, martin f krafft wrote:
>> also sprach Ron Johnson<ron.l.johnson(a)cox.net> [2010.05.03.1039 +0200]:
>>> Is that Q21?
>>>
>>> http://git.debian.org/?p=pkg-mdadm/mdadm.git;a=blob_plain;f=debian/FAQ;hb=HEAD
>>>
>>
>> Yes.
>>
>>>> 2. You were asked upon mdadm installation whether you wanted it, and
>>>> you chose to accept yes. dpkg-reconfigure mdadm if you don't
>>>> believe in this feature.
>>>
>>> Well, not me, since I don't have a soft array...
>>
>> Then you probably have much more annoying problems, or will have. ;)
>>
>
> I regularly backup to an external lvm2 LV.
>

I forget your specifics, but you do RAID *and* backup regularly to an
external lvm2?

Hugo


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From: Hugo Vanwoerkom on 4 May 2010 14:30
martin f krafft wrote:
> also sprach Hugo Vanwoerkom <hvw59601(a)care2.com> [2010.05.04.1808 +0200]:
>> I forget your specifics, but you do RAID *and* backup regularly to an
>> external lvm2?
>
> RAID is not a backup solution, it's an availability measure.
>

But as data availability goes up by using RAID doesn't the need for
backing up that same data go down? Or is this just semantics?

Hugo


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From: Eduardo M KALINOWSKI on 4 May 2010 14:40
On Ter, 04 Mai 2010, Hugo Vanwoerkom wrote:
> martin f krafft wrote:
>> RAID is not a backup solution, it's an availability measure.
>>
>
> But as data availability goes up by using RAID doesn't the need for
> backing up that same data go down? Or is this just semantics?

RAID does not prevent against you accidentaly deleting a file you did
not want deleted. And the deletion will be immediately reflected to
all disks in the array.


--
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Eduardo M KALINOWSKI
eduardo(a)kalinowski.com.br


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From: Ron Johnson on 4 May 2010 16:00
On 05/04/2010 11:08 AM, Hugo Vanwoerkom wrote:
[snip]
>
> I forget your specifics, but you do RAID *and* backup regularly to an
> external lvm2?
>

No, no RAID for me *at home*. But at work I manage databases on all
sorts of (to use a quaint old phrase) super-minicomputers, and if
they ever needed to "resynchronize" monthly, we'd have tossed them
out immediately, since for the money we spend on them, they're
supposed to stay in sync *always*.

--
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