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Re: [Consult-list] Re: [dm-devel] dm-multipath has great throughput but we'd like more!



Nicholas C. Strugnell wrote:
On Thu, 2006-05-18 at 10:04 +0200, Nicholas C. Strugnell wrote: 
  
On Thu, 2006-05-18 at 08:44 +0100, Bob Gautier wrote:
    
On Thu, 2006-05-18 at 02:25 -0500, Jonathan E Brassow wrote:
      
The system bus isn't a limiting factor is it?  64-bit PCI-X will get 
8.5 GB/s (plenty), but 32-bit PCI 33MHz got 133MB/s.

Can your disks sustain that much bandwidth? 10 striped drives might get 
better than 200MB/s if done right, I suppose.

        

  
It might make sense to test raw writes to a device with dd and see if
that gets comparable performance figures - I'll just try that myself
actually.
    

write throughput to EVA 8000 (8GB write cache), host DL380 with 2x2Gb/s
HBAs, 2GB RAM

testing 4GB files:

on filesystems: bonnie++ -d /mnt/tmp -s 4g -f -n 0 -u root

ext3: 129MB/s sd=0.43
  
I presume this is with journal=ordered.  Try with journel=writeback.  I've seen benchmarks which suggest it can be close to the speed of ext2.

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