[mythtv-users] Storage Questions. LVM, RAID, NFS

[James C. Dastrup]

>On Mon, May 01, 2006 at 03:06:33PM -0500, Dean Wilson wrote:
>> As I understand it from these discussions, Raid5 requires 5 drives, 4
>> of which will be used for storage?  (So 5 250GB drives would sum to
>> 1TB of useable HD space?)
>
>RAID 5 works with 3 or more drives.  I'm using 3x160Gb to get 320Gb
>of storage.  Using more drives results in less wasted space but
>increases the risk of a dual failure.  Most HOWTO type sites suggest
>that once you get to 6 or more drives you should use RAID 6 instead.
>

Someone is suggesting RAID 6 based on the number of drives in the
array?  That's asinine.  RAID 6 is basically RAID 5, except with 2
parity writes instead of 1.  The only advantage is you can lose 2 drives
instead of 1 and not lose any data, but it is even slower than RAID 5.

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