[mythtv-users] MythTV and LVM

[Ryan Pisani]

Jarod --
Are you using md tools to manage your previously stated RAID-5? I'm
curious, as I had looked into growing RAID5 and it appears that mdadm will
allow you to grow a linear array of disks. I'm using an older version of
md so maybe that is the issue. I'm assuming if you grow RAID-5 the
software handles redistributing the data and parity?

thanks
Ryan



> On Tuesday 31 January 2006 09:24, Roland Roberts wrote:
>>     >> Are there any other concerns for using LVM?  Are there any
>>     >> serious speed penalties?
>>
>>     PAUL> Yes, you are putting yourself in peril.  The more drives you
>>     PAUL> add to an LVM array, the more likely you are to have total
>>     PAUL> filesystem failure.  If one of the drives dies, your whole LVM
>>     PAUL> array is pretty much done for.
>>
>> Unless you LVM on top of RAID-1 which is what I do.  While this is
>> somewhat wasteful if you put a low value on your TV recordings, I have
>> other data which I do value and they share the LVM on RAID-1 disks in
>> different partitions.  Being able to expand the space for my photography
>> work at the expense of my TV space is useful to me....
>
> Personally, I prefer a RAID5 setup underneath LVM (for Myth, anyhow),
> since
> you can expand the capacity of a RAID5 array non-destructively. Grow the
> underlying RAID5, then grow the LVM, then grow the file system, and you've
> still got at least a bit of disk redundancy in addition to the ability to
> expand your capacity.
>
> However, I'm actually moving to a hardware SATA RAID controller, running a
> RAID5 w/a hot spare across 8 250GB disks. Won't be bothering with LVM
> though,
> I think this'll be enough capacity for at least a few years. :)
>
> --
> Jarod Wilson
> jarod at wilsonet.com
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>