Perc6 policy writeback and bbu

Joshua Miller jassinpain at gmail.com
Thu Jul 29 17:20:09 CDT 2010


Could this be it?


> http://yo61.com/dell-drac-bbu-auto-learn-tests-kill-disk-performance.html


On Jul 29, 2010, at 9:42 AM, Nicolas Chipaux wrote:

> Hello,
> 
> We notice that the Perc card one of our filer has switched to WriteThrough
> policy without any particular reason. We try to switch back to WriteBack to use
> the BBU, but the controler will not allow us to do that. We had to force the
> config to CachedBadBBU  to get the policy back to WriteBack but this situation
> is highly unstable. In the BBU information available with MegaCLI nothing seems
> to indicate any problem on the battery. 
> 
> Any idea ?
> 
> 
> So :
> 
> Default Cache Policy: WriteBack, ReadAheadNone, Cached, No Write Cache if Bad BBU
> Current Cache Policy: WriteThrough, ReadAheadNone, Cached, No Write Cache if Bad BBU
> 
> => MegaCli -LDSetProp WB -LAll -a0 
> Set Write Policy to WriteBack on Adapter 0, VD 0 (target id: 0) success
> Exit Code: 0x00
> 
> no success.
> 
> => MegaCli -LDSetProp CachedBadBBU -LAll -a0 
> Then the policy is switch to WriteBack ignoring the BBU status
> 
> In the BBU status from MegaCLI, where is the battery flagged as 'bad' ?
> 
> If we start a short learn cycle on the battery unit, the current policy first
> switches a few minutes to "WriteBack" (?!) but when the power level is going
> under the default threshold, the policy switch back to WriteThrough which is a
> normal behavior. But when the power level is back up wll above the threshold,
> the policy is still WriteThrough
> 
> 
> 
> About the battery unit :
> 
> => MegaCli -AdpBbuCmd -a0
> BBU status for Adapter: 0
> 
> BatteryType: BBU
> Voltage: 4040 mV
> Current: 0 mA
> Temperature: 32 C
> Firmware Status: 00000000
> 
> Battery state: 
> 
> GasGuageStatus:
>  Fully Discharged        : No
>  Fully Charged           : Yes
>  Discharging             : Yes
>  Initialized             : Yes
>  Remaining Time Alarm    : No
>  Remaining Capacity Alarm: No
>  Discharge Terminated    : No
>  Over Temperature        : No
>  Charging Terminated     : Yes
>  Over Charged            : No
> 
> Relative State of Charge: 98 %
> Charger Status: Complete
> Remaining Capacity: 835 mAh
> Full Charge Capacity: 854 mAh
> isSOHGood: Yes
> 
> BBU Capacity Info for Adapter: 0
> 
> Relative State of Charge: 98 %
> Absolute State of charge: 49 %
> Remaining Capacity: 835 mAh
> Full Charge Capacity: 854 mAh
> Run time to empty: 65535 Min
> Average time to empty: 65535 Min
> Average Time to full: 65535 Min
> Cycle Count: 11
> Max Error: 0 %
> Remaining Capacity Alarm: 170 mAh
> Remaining Time Alarm: 10 Min
> 
> 
> BBU Design Info for Adapter: 0
> 
> Date of Manufacture: 10/13, 2008
> Design Capacity: 1700 mAh
> Design Voltage: 3700 mV
> Specification Info: 33
> Serial Number: 368
> Pack Stat Configuration: 0x0008
> Manufacture Name: SANYO
> Device Name: DLKR174
> Device Chemistry: LION
> Battery FRU: N/A
> 
> 
> BBU Properties for Adapter: 0
> 
> Auto Learn Period: 7776000 Sec
> Next Learn time: 341873114 Sec 
> Learn Delay Interval:0 Hours
> Auto-Learn Mode: Enabled
> 
> 
> 
> Information about the Perc6 :
> 
>                    Versions
>                ================
> Product Name    : PERC 6/E Adapter
> Serial No       : 1122334455667788
> FW Package Build: 6.1.1-0047
> 
>                    Mfg. Data
>                ================
> Mfg. Date       : 06/24/08
> Rework Date     : 06/24/08
> Revision No     : 
> Battery FRU     : N/A
> 
>                Image Versions In Flash:
>                ================
> FW Version         : 1.21.02-0528
> BIOS Version       : 2.01.00
> WebBIOS Version    : 1.1-46-e_15-Rel
> Ctrl-R Version     : 1.02-014B
> Preboot CLI Version: 01.00-020:#%00004
> Boot Block Version : 1.00.00.01-0011
> 
> 
> Regards.
> 
> -- 
> Nicolas Chipaux
> GANDI - http://www.gandi.net
> 
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