View Single Post
  #5   (View Single Post)  
Old 31st October 2013
jggimi's Avatar
jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
Location: USA
Posts: 7,977
Default

Without knowing any of the details of your environment: disk drive models, hardware configuration (e.g.: shared bus or separate buses), competing uses of the drives outside of RAID, the details of the array's configuration, and a complete I/O performance report ... I can only make guesses. Here are three of them:

Guess 1: Perhaps sd1 is being utilized for reads more often than sd0 is?
Guess 2: Perhaps you have active non-RAID partitions using sd1?
Guess 3: Perhaps there are significant performance differences between the two disk drives?

Your disk drive models and hardware configuration are in your dmesg(8). If you use either of these drives outside of the softraid(4) array, this should be clear from the drives' disklabel(8). There's a lot of information in the iostat view of systat(8):
Code:
     iostat      Display statistics about disk throughput.  Statistics on disk
                 throughput show, for each drive, data transferred in
                 kilobytes, number of disk transactions performed, and time
                 spent in disk accesses (in fractions of a second).
I hope this helps.
Reply With Quote