I am in the process of benchmarking a 4 x 250GB on 3ware 7506 to try and sort out the myriad of options for RAID and XFS, in order to get best performance for my workload.
I have tested with software RAID5 and have just attempted to do the same for software RAID 10. Unfortunately, it is going to take 31000 minutes, or around 21 days to sync this array and I wish to test 3 different stripe sizes. Is there some way to allow more bandwidth for the sync up?
The RAID 5 took 70 minutes and was allowed up 100MB/s of idle IO bandwidth - RAID 1 seems to use < 200kB/s.
While I am very pleased with the hardware RAID 10 result (98261kB write, 97148kB read), I would prefer to use software RAID 10 for a few reasons, if the performance is similar.
The resync speed defaults to "nice and slow" IIRC... There should be some procfs tunable to increase the resync speed...
Jeff
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