Two harddrives - very big difference in perfomance

Hi everybody!

I have 2 harddrives installed on my server, and there is a big difference in perfomance:


/dev/hda:
Timing buffered disk reads: 106 MB in 3.02 seconds = 35.10 MB/sec
Epsilon#/>hdparm -t /dev/hda

/dev/hda:
Timing buffered disk reads: 110 MB in 3.03 seconds = 36.30 MB/sec
Epsilon#/>hdparm -t /dev/hdc

/dev/hdc:
Timing buffered disk reads: 168 MB in 3.02 seconds = 55.63 MB/sec
Epsilon#/>hdparm -t /dev/hdc

/dev/hdc:
Timing buffered disk reads: 168 MB in 3.00 seconds = 56.00 MB/sec
Epsilon#/>

Is there any other parameters to check? Why the difference is so big?

On my second server the difference is not too big:

/dev/sda:
Timing buffered disk reads: 198 MB in 3.02 seconds = 65.56 MB/sec
#/>hdparm -t /dev/sda

/dev/sda:
Timing buffered disk reads: 198 MB in 3.00 seconds = 66.00 MB/sec
#/>hdparm -t /dev/sdb

/dev/sdb:
Timing buffered disk reads: 200 MB in 3.02 seconds = 66.23 MB/sec
#/>hdparm -t /dev/sdb

/dev/sdb:
Timing buffered disk reads: 200 MB in 3.02 seconds = 66.23 MB/sec

 

 

 

 

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