[CentOS] CentOS 6, mptfusion software?

Tue Jul 12 18:07:07 UTC 2016
John R Pierce <pierce at hogranch.com>

On 7/12/2016 10:52 AM, m.roth at 5-cent.us wrote:
> I'll mention it to my manager. However, much more important is finding
> something that will tell me*which*  drive in a RAID just failed so I can
> replace it....

thats something thats remained a deep dark secret in the linux (and 
generic unix) world, 'left as an exercise to the reader'. there's no 
standard for mapping those SAS (or SCSI) backplane lights to specific 
drives, and my general experience is the lights only work right with 
brand name systems using their own brand name proprietary raid piles.   
there's a sas/scsi control command (it escapes me at the moment) which 
will turn on and off the backplane lights, but there's no standard glue 
for connecting this to the drive failure events.   A quick batch of 
googling suggests sas2ircu (LSI proprietary?), and ledmon 
(https://sourceforge.net/projects/ledmon/) are worth investigating.

I've printed labels with the partial WWN of the drives and stick them on 
each hot swap tray, and identified the failed drive via those.   to 
verify, I'll do something like a dd if=/dev/mdX of=/dev/null bs=65536, 
to make all the lights of the working drives blink as fast as possible, 
and verify the one I think I want to replace is the one thats not blinking

john r pierce, recycling bits in santa cruz