Controller battery charging and performance

Tino Schwarze linux-poweredge.lists at tisc.de
Fri Nov 6 06:13:03 CST 2009


Hi Trond,

On Fri, Nov 06, 2009 at 12:09:13PM +0100, Trond Hasle Amundsen wrote:

> I've been wondering about the battery learn cycle and performance of the
> PERC controllers, which happens approximately every three months. The
> docs state that during the learn cycle, performance will be degraded
> (for most applications), since the controller switches to write-through
> for all its virtual disks. However, I'm a bit puzzled as to exactly
> where this occurs in learn process.
> 
> AFAIK, the battery has three phases in which the controller is degraded:
> 
>   1. Battery reports "Power Low".
>   2. Battery enters "Learning" state
>   3. Battery enters "Charging" state
> 
> In which of these three phases will write-through be used, and
> performance be degraded?

Here is an OMSA Alert log of a battery charge cycle:

Severity : Ok
ID : 2358
Date and Time : Sat Oct 31 20:48:49 2009
Category : Storage Service
Description : The battery charge cycle is complete.: Battery 0
Controller 1

Severity : Ok
ID : 2279
Date and Time : Sat Oct 31 17:25:43 2009
Category : Storage Service
Description : The controller battery charge level is operating within
normal limits: Battery 0 Controller 1

Severity : Ok
ID : 2189
Date and Time : Sat Oct 31 17:25:43 2009
Category : Storage Service
Description : The controller write policy has been changed to Write
Back.: Battery 0 Controller 1

Severity : Ok
ID : 2199
Date and Time : Sat Oct 31 17:25:43 2009
Category : Storage Service
Description : The virtual disk cache policy has changed.: Virtual Disk 1
(vd3x750) Controller 1 (PERC 5/i Integrated)

Severity : Ok
ID : 2199
Date and Time : Sat Oct 31 17:25:43 2009
Category : Storage Service
Description : The virtual disk cache policy has changed.: Virtual Disk 0
(vd3x500) Controller 1 (PERC 5/i Integrated)

Severity : Ok
ID : 2247
Date and Time : Sat Oct 31 16:58:33 2009
Category : Storage Service
Description : The controller battery is charging.: Battery 0 Controller
1

Severity : Ok
ID : 2278
Date and Time : Sat Oct 31 16:58:33 2009
Category : Storage Service
Description : The controller battery charge level is below a normal
threshold.: Battery 0 Controller 1

Severity : Ok
ID : 2177
Date and Time : Sat Oct 31 16:58:18 2009
Category : Storage Service
Description : The controller battery Learn cycle has completed.: Battery
0 Controller 1

Severity : Ok
ID : 2188
Date and Time : Sat Oct 31 16:33:30 2009
Category : Storage Service
Description : The controller write policy has been changed to Write
Through.: Battery 0 Controller 1

Severity : Ok
ID : 2199
Date and Time : Sat Oct 31 16:33:30 2009
Category : Storage Service
Description : The virtual disk cache policy has changed.: Virtual Disk 1
(vd3x750) Controller 1 (PERC 5/i Integrated)

Severity : Ok
ID : 2199
Date and Time : Sat Oct 31 16:33:30 2009
Category : Storage Service
Description : The virtual disk cache policy has changed.: Virtual Disk 0
(vd3x500) Controller 1 (PERC 5/i Integrated)

Severity : Ok
ID : 2266
Date and Time : Sat Oct 31 14:47:43 2009
Category : Storage Service
Description : Controller log file entry: Battery is discharging: Battery
0 Controller 1

Severity : Ok
ID : 2248
Date and Time : Sat Oct 31 14:47:43 2009
Category : Storage Service
Description : The controller battery is executing a Learn cycle.:
Battery 0 Controller 1

Severity : Ok
ID : 2176
Date and Time : Sat Oct 31 14:46:41 2009
Category : Storage Service
Description : The controller battery Learn cycle has started.: Battery 0
Controller 1

HTH,

Tino.

-- 
"What we nourish flourishes." - "Was wir nähren erblüht."

www.lichtkreis-chemnitz.de
www.tisc.de



More information about the Linux-PowerEdge mailing list