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debug HDD performance on Ubuntu server

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Project Description

Hello,

we got a following system running as file server:
Ubuntu server
Intel SE7230NH1-E
Intel SRCU-42E 512MB PCIe SCSI controller

The problem is as follows:
/dev/sdb:
Timing cached reads: 2258 MB in [url removed, login to view] seconds = [url removed, login to view] MB/sec
Timing buffered disk reads: 478 MB in [url removed, login to view] seconds = [url removed, login to view] MB/sec

/dev/sdc:
Timing cached reads: 2202 MB in [url removed, login to view] seconds = [url removed, login to view] MB/sec
Timing buffered disk reads: 106 MB in [url removed, login to view] seconds = [url removed, login to view] MB/sec

You may recognise the difference :)
sdb is a stripped RAID array
sdc is mirrored, but that does not really explain such poor performance
there are 4 physical 10krpm drives
sdc is each 8GB on drive1 and drive2
sdb has the rest of drive1, drive2 and complete drive3 and drive4 as one stripped array


So the task is to get this fixed.

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