[CentOS] 3Ware 9550SX-4LP Performance

Kirk Bocek t004 at kbocek.com
Sun Oct 1 03:56:39 UTC 2006


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.

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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