PE 1800 PERC4/SC write performance

Irwan Hadi ihblist at gmail.com
Wed Apr 26 00:34:29 CDT 2006


I think the problem may be with the x64 version of the driver.

This is my result on a Dell PE1850 (PERC 4e/si) with 2 X 73 GB Maxtor
hard drives in RAID 1, RHEL 4:
---------------

        File size set to 1048576 KB
        Command line used: ./iozone -s 1g -i 0 testoutput
        Output is in Kbytes/sec
        Time Resolution = 0.000001 seconds.
        Processor cache size set to 1024 Kbytes.
        Processor cache line size set to 32 bytes.
        File stride size set to 17 * record size.
                                                            random 
random    bkwd  record  stride
              KB  reclen   write rewrite    read    reread    read  
write    read rewrite    read   fwrite frewrite   fread  freread
         1048576       4   48350   41138

iozone test complete.
---------------
Kernel: 2.6.9-22.0.2.ELsm

RAID driver:
megaraid cmm: 2.20.2.6 (Release Date: Mon Mar 7 00:01:03 EST 2005)
megaraid: 2.20.4.6 (Release Date: Mon Mar 07 12:27:22 EST 2005)
megaraid: probe new device 0x1028:0x0013:0x1028:0x016c: bus 2:slot 14:func 0
megaraid: fw version:[521S] bios version:[H430]



I doubt there is a  big difference between Maxtor VS Seagate hard
drives, so I think the issue most likely is with the x64 driver.

On 4/24/06, Hansjörg Maurer <Hansjoerg.Maurer at dlr.de> wrote:
> 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
> >>
> >>_______________________________________________
> >>Linux-PowerEdge mailing list
> >>Linux-PowerEdge at dell.com
> >>http://lists.us.dell.com/mailman/listinfo/linux-poweredge
> >>Please read the FAQ at http://lists.us.dell.com/faq
> >>
> >>
> >>
> >
> >
> >
>
> --
> _________________________________________________________________
>
> Dr.  Hansjoerg Maurer           | LAN- & System-Manager
>                                 |
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>
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