[CentOS] 3Ware 9550SX-4LP Performance

[Morimoto Kenji]

> I know there are a few 3Ware fans here and I was hoping to find some help.
> I just built a new server using a 3Ware 9550SX-4LP with four disks in raid
> 5. The array is fully initialized but I'm not getting the write performance
> I was hoping for -- only 40 to 45MB/Sec.

I've got similar trouble on old Xeon MBs with 5 PCI-X slot.
Try to use the other slot and clear PCI information on BIOS.

> 3Ware's site advertises 300MB/Sec writes using 8 disks on the PCI Express
> version of this card (the 9580 I think.) I'm guessing 4x PCI Express has
> more bandwidth but 133Mhz 64-bit PCI-X is no slouch. The only two things I
> need to change are to put the disks in 3GB/Sec SATA mode (they're in
> 1.5GB/Sec mode right now) and to enable memory interleaving on the
> motherboard (I only have two sticks of memory, this M/B needs 4 for
> interleaving.) But I don't think these things should drop me down to the
> write performance of a single IDE disk.
>
> Does anyone have any suggestions on improving write performance?
>
> The Details (I know the devil is in here somewhere):
>
> Supermicro X7DVL-E Motherboard
> Dual Xeon 5130 (2 Ghz)
> 2GB RAM
> 3Ware 9550SX-4LP in a 133Mhz 64-bit slot.
> 4x Seagate ST3400620AS 400GB SATA Drives
> NCQ Enabled but currently in 1.5GB/Sec mode
> CentOS 4.4, Kernel 2.6.9-42.0.2.ELsmp
> Stock Kernel 3Ware Driver 2.26.04.010
>
> Bonnie++ 1.03a 50GB Benchmark run four times on an ext3 filesystem:
>
>                   ------Sequential Output------ --Sequential Input-
> --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> Machine      Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec
> %CP Beryl     50G:64k 44572  77 53084  14 40624   7 47790  72 162504  12 
> 96.5   0 Beryl     50G:64k 45960  79 53068  14 39972   7 47701  73 162510 
> 12  96.8   0 Beryl     50G:64k 36846  64 37579  10 36785   6 48090  72
> 162609  12  96.9   0 Beryl     50G:64k 45205  77 53621  15 40757   7 48325 
> 73 162331  12  96.4   0 ------Sequential Create------ --------Random
> Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
> files:max:min    /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
> Beryl        16  3928  99 +++++ +++ +++++ +++  3961  98 +++++ +++ 12442  99
> Beryl        16  3929  98 +++++ +++ +++++ +++  3957  99 +++++ +++ 12373 100
> Beryl        16  3718  94 +++++ +++ +++++ +++  3389  84 +++++ +++ 12307  99
> Beryl        16  3920  98 +++++ +++ +++++ +++  3969  99 +++++ +++ 12421  99
>
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