Performance/stability problems on PowerEdge 1950

Claudio De Luca claudio at serverplan.com
Fri Dec 15 10:32:20 CST 2006


Greetings,

i have a couple of 1950 with SAS raid hd but no issue until now, i use 3Gb 
of ram on each server

Regards
Claudio
----- Original Message ----- 
From: "Sturgis, Grant" <Grant.Sturgis at arraybiopharma.com>
To: <linux-poweredge at dell.com>
Sent: Friday, December 15, 2006 5:23 PM
Subject: Re: Performance/stability problems on PowerEdge 1950


> Greetings,
>
> We received the below tech note from an ISV that we use that uses the
> 1950.  Is it relevant to this particular problem, and does it fix the
> issue?  We don't know the answers to this because we don't have a 1950....
>
> HTH
>
> Tech note:
> --------------------
>
> Hello,
> Below please find information on a critical update from Dell that needs
> to be applied immediately to all <ISV> devices that are Dell 1950s.
>
> Package Version - 5.0.2-0003
> Firmware Version - 1.00.01-0157
> SASBIOS Version - MT23
> Ctrl-R Version - 1.02-007
> MPT Version - 00.06.71.00-IT
>
> Fixes:
> Addresses potential issue with PERC 5 controllers that may become
> unresponsive on systems with 8GB of memory or more. This fix corrects an
> issue on systems with 8+ GB of memory PERC 5 controllers may become
> unresponsive. If the affected controller is the boot device this would
> cause an OS crash, hang, or bluescreen. If not the boot controller the
> system would experience timeouts (event 129 and 9 in windows, IO aborts
> in Linux). Once the controller is in this state it will not return to
> operation until the system has rebooted, any storage connected to the
> controller will not be accessible until the reboot. This has now been
> corrected.
>
>
>
> Dean Manners wrote:
>> Harry,
>> I have an identical anecdote, coming from 1850 to 1950.  Under high
>> disk I/O the machine becomes very laggish and generally performs badly in
>> comparison to the SCSI based 1850's.  Running Debian with 2.6.18, moduled
>> megaraid_sas, sd_mod, scsi_mod. Also keen to hear of any ideas or
>> directions..
>>
>> Regards
>> __________________________________________
>> Dean Manners
>>
>>
>>> -----Original Message-----
>>> From: linux-poweredge-bounces at dell.com
>>> [mailto:linux-poweredge-bounces at dell.com] On Behalf Of Harry Roberts
>>> Sent: Thursday, December 14, 2006 11:05 PM
>>> To: linux-poweredge at dell.com
>>> Subject: Performance/stability problems on PowerEdge 1950
>>>
>>> Hi all,
>>>  We recently upgraded from SCSI based Dell 1850s to SAS based
>>> Dell 1950s and found that under the same loads, stresses,
>>> applications & conditions the SAS based 1950 system starts
>>> failing and becoming unresponsive at a much earlier point.
>>>
>>>  One of the main roles of the servers are to perform
>>> telephone call recording, which in turn means that there are
>>> lots of concurrent writes per second (say 20 per second, per
>>> concurrent call). The SCSI based system was able to easily
>>> handle 60+ calls, while the SAS based system was having
>>> serious problems at around 30.
>>>
>>>  We also performed the same tests on a SAS HP DL360 g5
>>> (SmartArray RAID controller), which performed even worse and
>>> stopped operating normally at around 7 concurrent calls.
>>>
>>>  On both we're using Gentoo with the stock 2.6.18.x kernel
>>> and Gentoo's patched 2.6.18.x kernel, we then tested again on
>>> a 1950 server using Redhat EL 4, and none of these problems
>>> occurred. It seems that something in Redhat's heavily
>>> modified 2.6.9 kernel is fixing it - but we can't track down
>>> exactly what.
>>>
>>>  Has anybody run into similar problems with system load
>>> skyrocketing or application response times increasing
>>> massively when there's high disk load on SAS any of Dell's
>>> SAS based PowerEdge series servers?
>>>
>>>  Any ideas or possible directions we could go in are appreciated.
>>>
>>>  Thanks,
>>>
>>> - Harry Roberts
>>> - Software Developer, Telappliant Ltd.
>>> - Phone: +44 (0)207 043 3519
>>> - Email: harry at telappliant.com
>>>
>>> --
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>>>
>>>
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>>
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