Dell PERC5/i SAS5/5IR - RAID monitoring

[Michael Worobcuk]

Am 21.07.2007 um 00:18 schrieb Tom Judge:

> Michael Worobcuk wrote:
>>> Tom Judge wrote:
>>>
>>> As for performance issues with the SAS5/i, there is a problem in  
>>> the controller.  A work arround was created by Scott Long which  
>>> created a sysctl that could be set to cause the controller to  
>>> turn on the on drive write cache's. These changes where commited  
>>> to RELENG_6 on 2007-06-05 21:32:57 UTC.
>>>
>>>
>>> ...
>>>
>>>>
>>>> Here is the original commit log:
>>>>
>>>> scottl      2007-06-03 23:13:05 UTC
>>>>
>>>>   FreeBSD src repository
>>>>
>>>>   Modified files:
>>>>     sys/dev/mpt          mpt.c mpt.h mpt_cam.c
>>>>   Log:
>>>>   mpt.c:
>>>>   mpt.h:
>>>>           Add support for reading extended configuration pages.
>>>>   mpt_cam.c:
>>>>           Do a top level topology scan on the SAS controller.   
>>>> If any SATA device are discovered in this scan, send a  
>>>> passthrough FIS to set the write cache.  This is controllable  
>>>> through the following tunable at boot:
>>>>
>>>>           hw.mpt.enable_sata_wc:
>>>>                   -1 = Do not configure, use the controller default
>>>>                    0 = Disable the write cache
>>>>                    1 = Enable the write cache
>>>>
>>>>           The default is -1.  This tunable is just a hack and  
>>>> may be
>>>>           deprecated in the future.
>>>
>> I set mpt.enable_sata_wc to 1, as hw.mpt.enable_sata_wc is, AFAIK  
>> not tunable in mpt_cam.c. This did not take any effect to the  
>> performance. Is there anything else to change ?
>
> Not that I know of, do you have SAS or SATA disks attached to the  
> controller?

yes, SAS.