Re: asymmetric NFS transfer rates

From: Andre Guibert de Bruet (andy_at_siliconlandmark.com)
Date: 11/02/04

  • Next message: joe mcguckin: "Re: USB Key Disk Boot" 
    Date: Tue, 2 Nov 2004 11:50:22 -0500 (EST)
To: Emanuel Strobl <Emanuel.Strobl@gmx.net>

    On Tue, 2 Nov 2004, Emanuel Strobl wrote:

    > Am Dienstag, 2. November 2004 13:47 schrieb Claus Guttesen:
    >>> problems, but I'm wondering why I
    >>> can't write to my 5.3-stable NFS server more that
    >>> 3,5MB/s while reading gives
    >>> me 9,5MB/s?
    >>
    >> Are you using IDE- or SCSI-disks? Reading is faster
    >> than writing on IDE.
    >
    > Like I wrote, the server writes more than 35MB/s onto the RAID5 array. Last
    > time I saw a hard drive which has problems with 10MB/s was 6 years ago, no
    > matter of IDE or SCSI.

    You are going by the assumption that the benchmarks are run using
    transfers of a single, contiguous, abnormally huge file. In the real
    world, things aren't that peachy. Remember to factor in things such as
    seek times, drive response latency, driver locking and contention on
    Giant (This is a SCSI RAID card, isn't it?), among other things...

    Regards,
    Andy

    | Andre Guibert de Bruet | Enterprise Software Consultant >
    | Silicon Landmark, LLC. | http://siliconlandmark.com/ >
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