SAS 6/iR write performance depends on kernel version, blade serverm600

[L.P.H. van Belle]

a few day ago mr. kmuto make a new iso 
i'm going to try tonight. 

http://kmuto.jp/b.cgi/debian/d-i-2625-etch.htm 
kernel 2.6.25 ( from RC5) had the patch.

if other people could try this iso also.

Louis
 

>-----Oorspronkelijk bericht-----
>Van: linux-poweredge-bounces at dell.com 
>[mailto:linux-poweredge-bounces at dell.com] Namens Alessandro FAGLIA
>Verzonden: vrijdag 30 mei 2008 11:17
>Aan: linux-poweredge at lists.us.dell.com
>Onderwerp: Re: SAS 6/iR write performance depends on kernel 
>version, blade serverm600
>
>-------- Original Message  --------
>Subject: Re: SAS 6/iR write performance depends on kernel 
>version, blade 
>server m600
>From: Dominique LALOT <dom.lalot at gmail.com>
>To: Alessandro FAGLIA <a.faglia at farmol.it>, linux-poweredge at dell.com
>Date: Fri May 30 2008 10:34:05 GMT+0200 (ora legale Europa occidentale)
>> Alessandro FAGLIA a écrit :
>>> -------- Original Message  --------
>>> Subject: SAS 6/iR write performance depends on kernel 
>version, blade 
>>> server    m600
>>> From: Dominique LALOT <dom.lalot at gmail.com>
>>> To: linux-poweredge at dell.com
>>> Date: Mon May 19 2008 16:05:10 GMT+0200 (ora legale Europa 
>occidentale)
>>>> Hello,
>>>>
>>>> That's quite a long time, I'm "playing" around a 
>performance problem.
>>>>
>>>> We just acquire some  new blades and  I discovered 
>something strange 
>>>> affecting the new SAS 6 subsystem.
>>>>
>>>> [...]
>>>>
>>> Good morning Mr Lalot.
>>>
>>> I'm a Linux-PE ML reader, and we are buying two new R300 
>server with 
>>> SAS 6iR RAID controller. We'd like to use them in RAID1 
>configuration.
>>>
>>> I read your thread named "SAS 6/iR write performance depends on 
>>> kernel version, blade server m600". BTW, there are other threads in 
>>> the lists say that Debian (any version) is not going to 
>work on such 
>>> controller. 
>> We are all using linux, we should not say debian won't .. or redhat 
>> will.. What we like about debian is the packaging system and 
>the very 
>> few packages installed at first which is perfect for servers.
>> Debian Etch is working prefectly on LSI sas 6. That's a 
>kernel issue. 
>> Fortunatly all the "Dell supported distrib" are using a 
>kernel <2.6.18.
>
>Now I understand. If I'm correct, we should simply compile a kernel 
>version less than 2.6.18 and everything should be fine.
>
>> I'm still looking at kernel patch to see why sas 6  LSI 
>controller is 
>> working so bad in the last kernels. I'm sure now, that the last 
>> kernels are asking firware, and the default settings are bad.
>>
>> What we can say, is that last Ubuntu server 8.04  behaves very badly 
>> with LSI sas 6 (2.6.24)
>
>Thanks for your feedback.
>
>--
>Alessandro
>
>
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