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Re: SW RAID read performance



On Thursday, 03.08.2006 at 15:30 -0400, Justin Piszcz wrote:

> I've only ran the benchmarks on a single controller.  Run a test for me, 
> read a lot of data on the drive and show us iostat -x -k 1 and see if it 
> reads from both drives at the same time.

http://www.sungate.co.uk/tmp/iostat.log - iostat log while cat-ing a
large file on /dev/md2

$ cat /proc/mdstat 
Personalities : [raid1] 
md1 : active raid1 sdb2[0] sda2[1]
      19534976 blocks [2/2] [UU]
      
md3 : active raid1 sdb3[1] sda3[0]
      4000064 blocks [2/2] [UU]
      
md2 : active raid1 sdb4[0] sda4[1]
      156071360 blocks [2/2] [UU]
      
md0 : active raid1 sdb1[0] sda1[1]
      19534912 blocks [2/2] [UU]
      
unused devices: <none>

Not entirely sure how to interpret the results, but there is some
suggestion that it is reading from both disks...

Dave.
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