Re: Is It Hopeless?

[Phil Turmel <philip@turmel.org>]

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On 12/27/2010 08:10 AM, Carl Cook wrote:
>> Every time I read/hear this I cringe.  If that is the case your data is worthless to begin with so just delete it all right now.  You are literally saying the same thing with your statement. 
> 
> No, I'm saying that the MTBF of disk drives is astronomical, and the likelihood of a fail during backup is miniscule.  MTBF of tape is hundreds of times sooner.  Not to mention that tape would take forever, and require constant tending.  This is why it's not used anymore.  My storage is 2TB now, but my library is growing all the time.  Backing to off-line disk storage is the only practical way now, given the extremely low cost and high capacity and speed.  Each WD 2TB drive is $99 from Newegg!  Astounding.  Thanks for the input though.
> 
> 
> On Sun 26 December 2010 21:35:03 Phil Turmel wrote:
>> I, too, use an alternate server to back up to, but my daily changes are small enough to rsync over the net.  To reduce the chance of double failures in my arrays, a cron job kicks off a "resync" weekly.
> 
> Can you please give some detail on your sync scripts?  I've never done this and am not a programmer, but I'm a pretty good shade-tree admin.

Sure.  Attached.  Note that the script doesn't set the sysctls for speed limits...  The defaults are fine for me.

HTH,

Phil

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#!/bin/bash
#
# Weekly Cron Job to initiate RAID scan/repair cycles

for x in /sys/block/md*/md/sync_action ; do
	echo repair >$x
done

# Process occurs in background kernel tasks