[nSLUG] Tip: check your BBU on raid controllers

D G Teed donald.teed at gmail.com
Wed Jan 30 06:50:12 AST 2013

On Sun, Jan 27, 2013 at 11:34 AM, Dop Ganger <nslug at fop.ns.ca> wrote:

> On Fri, 25 Jan 2013, D G Teed wrote:
>  Thought I'd share a server tip.  This is specific to Perc controllers
>> and use of Open Manage, but there could be other brands which
>> also disable write-back (for controller cache) in a similar way,
>> as the BBU degrades.
> And along similar lines, a tip I found the other day for anyone running
> software RAID... Force a background check to ensure the entire RAID is
> readable (before you find it during use) with "echo check >
> /sys/block/mdX/md/sync_action"**.
Debian does this in a first Sunday in the month cron .
That command is essentially the meat of /usr/share/mdadm/checkarray

Redhat includes this resync in /etc/cron.weekly/99-raid-check
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