patrol reads and megaraid_sas (WAS: [Fwd: What is the "Patrol readstart/stop" snmp alert ?])

Patrick_Boyd at Dell.com Patrick_Boyd at Dell.com
Mon Oct 1 08:30:58 CDT 2007


Ok another thing I would suggest checking is the Patrol Read Rate. I'm
not sure where this is exposed on megacli but it should be set at <=
30%.

As for the SAS Backplane firmware, you can use a live CD of linux to
perform the flash. 

-----Original Message-----
From: Brian A. Seklecki [mailto:seklecki at collaborativefusion.com] 
Sent: Friday, September 28, 2007 4:42 PM
To: Boyd, Patrick
Cc: bseklecki at collaborativefusion.com; linux-poweredge-Lists; Terrey,
Nico
Subject: RE: patrol reads and megaraid_sas (WAS: [Fwd: What is the
"Patrol readstart/stop" snmp alert ?])


Here is his report:

http://lists.freebsd.org/pipermail/freebsd-hardware/2007-September/00467
6.html

We'll investigate with the FreeBSD driver developer.

There has been mention here of an SAS backplane firmware patch that can 
only be applied in Windows and RHEL.

~BAS

On Fri, 28 Sep 2007, Patrick_Boyd at Dell.com wrote:

> No, there really weren't any issues with the driver with Patrol Read.
> There were some issues about the driver sending more commands than the
> controller could handle forcing file systems into read-only mode. This
> has been prevented in the latest Linux driver so you might want to
look
> at it.
>
> Patrick Boyd
>
> -----Original Message-----
> From: linux-poweredge-bounces at dell.com
> [mailto:linux-poweredge-bounces at dell.com] On Behalf Of Brian A
Seklecki
> (Mobile)
> Sent: Friday, September 28, 2007 2:17 PM
> To: linux-poweredge-Lists
> Cc: Terrey, Nico
> Subject: patrol reads and megaraid_sas (WAS: [Fwd: What is the "Patrol
> readstart/stop" snmp alert ?])
>
> All:
>
> Does anyone recall any outstanding bugs with the 1st revision of 9th
gen
> severs where automatic patrol reads and the megaraid_sas driver didn't
> play well together? (e.g, read/write operations failing due to HBA
> resource consumption, etc.)
>
> We're tracking a problem in the FreeBSD mfi(4) driver and were curious
> if the Linux driver befell the same symptoms.
>
> ~BAS
>
>
>
>
>
>
>



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