PE 1800 PERC4/SC write performance

Hansjörg Maurer Hansjoerg.Maurer at dlr.de
Tue Apr 25 00:36:26 CDT 2006


Hi



Irwan Hadi wrote:

>What kind of RAID configuration, 
>
raid1, 2 drives SEAGATE  ST3146707LC
StripeSize = 64KB
Write Policy = WRBACK
Read Policy = ADAPTIVE
Cache Policy = CachedIO

>how many drives are in this RAID set,
>operating system,
>
RHEL4 x86_64 Kernel 2.6.9-22.0.2.ELsmp,

> and what is the your PERC BIOS 
>
FW Ver 351X from  RAID_FRMW_LX_R119710.BIN
Bios Ver 1.10


>and driver 
>
dkms status | grep 22.0.2

jbd, 1.1, 2.6.9-22.0.2.ELsmp, x86_64: installed (original_module exists)
megaraid, v2.20.4.4, 2.6.9-22.0.2.ELsmp, x86_64: installed
(original_module exists)
(dell drivers)

>version?
>  
>
Here are some iozone numbers

         KB           reclen   write rewrite    read    reread  
        16777216       4    8147   32133    40719    40464    
        16777216       8    8116   32471    40224    40113   
        16777216      16    8174   28179    34096    35487   
        16777216      32    8302   28308    34800    33881   
        16777216      64    7905   27844    35841    35123   
        16777216     128    8226   28124    34931    33218 
        16777216     256    7815   28126    35025    35891  
        16777216     512    8275   27921    32390    32615  

Greetings from Munich

Hansjörg

>On 4/23/06, Hansjörg Maurer <hansjoerg.maurer at dlr.de> wrote:
>  
>
>>Hi
>>
>>we are experiencing the same slow write performance
>>Do you find a solution?
>>
>>Greetings
>>
>>Hansjörg
>>
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>>    
>>
>>
>
>  
>

-- 
_________________________________________________________________

Dr.  Hansjoerg Maurer           | LAN- & System-Manager
                                |
Deutsches Zentrum               | DLR Oberpfaffenhofen
  f. Luft- und Raumfahrt e.V.   |
Institut f. Robotik             |
Postfach 1116                   | Muenchner Strasse 20
82230 Wessling                  | 82234 Wessling
Germany                         |
                                |
Tel: 08153/28-2431              | E-mail: Hansjoerg.Maurer at dlr.de
Fax: 08153/28-1134              | WWW: http://www.robotic.dlr.de/
__________________________________________________________________


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