Re: md RAID with enterprise-class SATA or SAS drives

[Phil Turmel <philip@turmel.org>]

On 05/10/2012 01:53 PM, Keith Keller wrote:
> On 2012-05-10, Phil Turmel <philip@turmel.org> wrote:
>>
>> Frequent array checks are not optional, if you want flush out any UREs
>> in the making, and maximize your odds of successfully rebuilding after
>> a drive replacement.  If you are running RAID6 or a triple mirror, with
>> frequent checks, you are very safe.
> 
> How frequent do people define as "frequent"?  I typically do monthly
> checks, but perhaps I should be doing them weekly.

I do them weekly...  the following is called from my crontab:

#!/bin/bash
#
# Weekly Cron Job to initiate RAID scan/repair cycles
for x in /sys/block/md*/md/sync_action ; do
        echo check >$x
done
# Process occurs in background kernel tasks