Hard Disk Speed

We built a new server but i think we may be not getting good hard disk speeds.

Our server has 2 drives...

Drive C has 2 hard disks configured in RAID 1. both disks are 15K SCSI.

Below are the speeds i am getting on Drive C

Sequential Read: 130 MB per second
Sequential Write: 120 MB per second
Random Access: 13 MB per second


Drive D has 4 146 GB SCSI hard disks configured in RAID 10

Sequential Read: 150 MB per second
Sequential Write: 140 MB per second
Random Access: 15 MB per second


Could you please let me know if these speeds are enough?

We have 2 quad core processors on the machine with 32 GM DDR3 RAM.


Thank You

Kashif
5 answers Last reply
More about hard disk speed
  1. The speed will be dependent on the data density, ie GB per platter.

    What are the model numbers of your drives?

    Could we see a benchmark graph, eg one produced by HD Tune?




  2. I am sorry but i do not have the model of the drives as hosting company has every thing. I ran the HD Tune and have attached the images of the results.

    Please help

    Thank You
  3. Those are perfectly decent speeds for hard drives - whether or not they're "enough" depends on your workload.
  4. 4 disks in Raid-10 should deliver about twice the individual contiguous throughput, so this one isn't good.
    The Raid-1 is all right, from your measures.
  5. Thanks for the reply pointervoid

    We have another server configured in RAID 1 that easily gives 200 MB/second speeds... meaning faster than the 4 disk RAID 10.

    Could you plz suggest what could be the reason that RAID 10 configuration is actually slower than the RAID 1 configuration?

    Is it because of the RAID cards? or something else?

    Any ideas will be appreciated.

    Thank You

    Kashif Idrees
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