Drive mirroring - opinion wanted

[abreauj-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org (John Abreau)]

RAID-5 is inherently fragile, and we were using a hardware RAID
that didn't have proper monitoring tools available for Linux.

Mirroring is more robust than RAID-5.  Either way, it's imperative that
you set up an automated mechanism to monitor it so you're alerted
in a timely fashion when there's a problem that needs attention.



On Sat, Jun 6, 2009 at 10:12 AM, Jerry Feldman<gaf-mNDKBlG2WHs at public.gmane.org> wrote:
> I've installed it, and I'll take a serious look at it. ?I'm a bit gun shy
> because of the BLU crash where our RAID5 failed, and my home backup was
> screwed up because of a virtual machine in the middle of my backup tarfile
> which truncated my recovery in roughly the same time frame. Since I am not
> running a mission critical server, this might be a good replacement for my
> own backup script.
>
> On 06/06/2009 09:18 AM, Dan Ritter wrote:
>>
>> On Sat, Jun 06, 2009 at 08:38:02AM -0400, Jerry Feldman wrote:
>>
>>>
>>> recently, I acquired a 1TB SATA drive for home as an addition to my
>>> existing 160GB drive. Obviously, the proper way to set things up are to have
>>> 2 identical drives. I do back up my system daily to a USB drive, but I would
>>> just like some recommendations before I move to Fedora 11.
>>> I do have enough space on a USB drive to back up everything important
>>> (such as /home, and my virtual machines) so I can do a complete reformat if
>>> necessary.
>>> But, what I would like to do is to continue to use my 160GB as my primary
>>> drive (currently set up as LVM), and install fedora 11 onto the new drive. I
>>> currently have 1 137G volume group on the 160 GB drive. Can I simply
>>> allocate a 137GB volume group on the 1TB drive to use as a mirror for the
>>> 137VG on the 160.
>>>
>>> Or, would I be better off starting from scratch when I install Fedora 11,
>>> use the 1TB drive as the boot drive and set up multiple volume groups, or
>>> simply just rely on my existing daily backups.
>>>
>>
>> You could do any of these things, but you might be happiest
>> allocating 200GB or so of the new disk as a filesystem to use as
>> a repository for rsnapshot. rsnapshot can provide you with
>> multiple revisions of whatever happens on your 137GB volume, in
>> an easier-to-access form than LVM's snapshotting capabilities.
>>
>
>
> --
> Jerry Feldman <gaf-mNDKBlG2WHs at public.gmane.org>
> Boston Linux and Unix
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>
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-- 
John Abreau / Executive Director, Boston Linux & Unix
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