[vdr] Re: Disk space

[Bernd Felsche <bernie@innovative.iinet.net.au>]

On Thu, Mar 06, 2003 at 03:44:17PM +0100, Steffen Koch wrote:
> I was thinking it over for a while now... I now have some amount
> of disk space. All in all it's about 400 Gigs on 4 disks. I'd like
> to build a software raid5 and on top of it an LVM with space for
> the videos, the mp3s, other stuff for networking clients...

> Is it possible to add additional disks to a running raid5 config?
> I know that I can add volumes to a LVM VG, and then dynamically
> resize the partitions (LVs) including the fs on it.

I wouldn't use raid5 for a recorder. The data striping will cause
all drives to write simultaneously as the bits get splattered across
the lot. Hence raid5 writes very slowly (it sucks dirty swamp water
through a crushed straw if you're transacting on an RDBMS). 

raid10 (1+0) is probably the fastest and "safest". But you need
double the number of drives (capacity).

If drives are hot-pluggable, then it's theoretically feasible to add
storage on the fly. You may have to convnce the kernel to re-probe
the corresponding interfaces; no big deal with SCSI drivers as
they're hot-pluggable (but make sure your electronics are as well!).

Choose your filesystems carefully!

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