At 1:57 PM -0500 2/23/2010, Len Gerstel wrote:
On Feb 23, 2010, at 1:40 PM, <mailto:[email protected]>[email protected] wrote:
I have a PM G5 2.7 DUAL and I'm installing a Jive 5 unit and a
Seritek card to allow 5 2TB drives internally.
I need some expert advise on how and what type of Raid system I
need to store and quickly access a large music and movie library?
At the moment I have it stored on 3 machines via 1000 Ethernet and
Firewire externals.
I want it all in one central machine, the one that does all the
ripping. The transfer rates from one drive to another is real slow
compared to internal drives in one box.
How good are your backups??
The trade off in raid is speed vs reliability. The more speed you go
for, the higher likelihood is for catastrophic data loss.
Basically, the fastest is striping the drives into one large virtual
drive, RAID 0. However if 1 drive fails or becomes corrupted, ALL
data is lost.
For Data security at the cost of speed is RAID 5 across 3 disks.
There is a parity bit so that if one drive fails, you still can
recover the data by replacing the failed drive. Slower than RAID 0,
but your data is secure.
until the RAID card itself dies, and spazzes out on the master
blocks. The replacement card cannot then recover things, so you've
lost it all anyway.
Which brings you back to Len's first query. Iffa you do RAID you
gots to keep really good backups or risk loosing EVERYTHING. Big
datacenters use RAID with LOTS of HDs - so they have both performance
and data integrity. AND they also push their data off to other
arrays.
- Dan.
--
- Psychoceramic Emeritus; South Jersey, USA, Earth.
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