[aklug] Re: RAID 6 vs. 5 w/ hot spare

I'm also about to migrate to a new file server, and wonder if this would be a
good topic for a AKLUG Friday night presentation if someone is extra smart on
storage file systems and would like to share?

My plan is to build a FreeNAS box with three 1TB drives to create a ZFS mount
for storage (with a rotating external drive and internal hot backup, just
because I've got the hardware lying about). Having someone present and overview
on the different technologies that are currently running around (raid, zfs, lvm,
etc) and the best use for each would be great.

Just thinkin,

--Jason

On 02/13/2011 07:38 PM, Joshua J. Kugler wrote:
> On Sunday 13 February 2011, Scott A. Johnson elucidated thus:
>> Have a 8 drive RAID 5 with ~1.4TB capacity that has been full for a
>> while and is getting old. Just ordered the hardware to migrate over
>> to a 5-drive NAS with 2TB drives. I'll only use three of the drives
>> for storage as the other two will either be parity in a RAID 6 or
>> parity plus hot spare in a RAID 5. Anyone with suggestions, thoughts,
>> or experiences on one configuration versus the other?
> Have you taken into account the fact that a 2TB drive has more bits than
> 1/(error rate)? Thus, your chance of bit error while reading the
> entire drive is> 1, thus (in theory) you could never successfully
> rebuild your RAID array? Personally, I'd only use maximum capacities
> of 500 to 750GB or so in my RAID drives.
>
> j
>

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Received on Sun Feb 13 20:08:53 2011