[mythtv-users] RAID 1

Daryl McDonald darylangela at gmail.com
Fri Aug 29 16:49:12 UTC 2014


On Fri, Aug 29, 2014 at 11:36 AM, Simon Hobson <linux at thehobsons.co.uk>
wrote:

> Daryl McDonald <darylangela at gmail.com> wrote:
>
> > Greetings Mythizens, I have a 250 (sda) with the OS on it and two
> terrabytes (sdc) with /var/lib/mythtv on it and (sdb) mount / ext 4. I
> found a ubuntu thread and I'm wondering if this is a good way for me to go:
>
> That depends on what you are trying to achieve. *In general* it's not
> recommended to put your recordings on RAID volumes - it's not that it won't
> work, just that the gains generally aren't big and there are downsides.
>
> > I want to preserve the recordings on sdc and mirror them to sdb.
>
> Presumably this is an "Oh bother, the drive has failed, but it's OK I have
> a backup" interpretation of preserve ?
> An alternative is to avoid RAID and just periodically update the backup
> directory with the contents of the live directory. This is actually (in
> many ways) better than mirroring with RAID - with RAID1, if you delete a
> file or corrupt the filesystem then both copies get instantly updated. It's
> an often quoted thing, but RAID is not a backup.
>
> If you clarify what it is you want to achieve, and give some indication of
> your priorities, then it's possible to suggest whether RAID is the best
> solution for you.
>
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>



With all the mucking around I've been doing lately there was a small
indication that there was a bad sector on the terabyte drive that I used to
use for the entire system, partitioned, of course. So having a recordings
backup is my aim, eventually any drive will fail, right? At my disposal
currently are the aforementioned 250, and two terabytes as well as an
external terabyte. I am open to simple effective suggestions.
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