[mythtv-users] Better think twice before choosing an FS especially for LVM

[mrmagoo]

I have a question about RAID+LVM I honestly couldn't understand. I'm 
assuming you are using RAID5 or some other kind that can't be resized; what 
is the benefit of using an LVM on such? From what I read, the LVM would be 
set to md0 and if you wanted to add another drive you'd need to add a new md 
device, aka 3+ more drives and a lost drive's worth space.

So, in this kind of case, is there any point of even using it?

I just recently lost 250x4 in a RAID5 due to 1 drive failing and the 
filesystem on another drive getting completly corrupted. I'm still not sure 
what happened, but the SATA controller went poof and I think heat is to 
blame (my fault). I'm still at a loss as to what filesystem I should use, 
but was leaning twords XFS.

Also just googling while writing this message I stumbled upon 
http://www.mail-archive.com/linux-raid@vger.kernel.org/msg01981.html , 
mentioning EVMS ( http://evms.sourceforge.net ). In particular it says it 
supports resizing RAID5, and it looks like you could do 
mdadm->EVMS(resize)->mdadm. I know nothing about this, has anyone used it 
before? It's still updated, while raidreconf doesn't appear to be.

On 9/15/05, Andrew McNabb <amcnabb at mcnabbs.org> wrote:
> 
> On Thu, Sep 15, 2005 at 03:41:05PM -0600, Brandon Beattie wrote:
> > What exactly are you achieving by using raid5? Does the phrase Raid5
> > make you feel invinsible?
> 
> As you have said, there are lots of possible types of failure, and
> someone who thinks that raid will save them from everything is an idiot.
> 
> However, I use raid in conjunction with LVM on my myth box, and I've
> been really happy with it. For me, the issue is that the more hard
> drives you have, the greater the frequency of failure. As someone who
> has seen a lot of dead hard drives, I believe that normal hard drive
> failure is my weakest link. Just a few weeks ago I had a disk die, and
> raid saved me (and my roommates who use mythtv) a lot of inconvenience.
> Of course, I also do backups of important data.
> 
> 
> --
> Andrew McNabb
> http://www.mcnabbs.org/andrew/
> PGP Fingerprint: 8A17 B57C 6879 1863 DE55 8012 AB4D 6098 8826 6868
> 
> 
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> 
> 
>
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