How disk I/O affect postfix performance ?

From: Yu (Irvin) Fan ("Yu)
Date: Thu Feb 12 2009 - 20:47:55 EST

  • Next message: Sahil Tandon: "Re: Add X-Envelope From/To into incoming mail"

    Hi,

    We're building a box to run two postfix instances to receive and send high
    volume of emails. According to the documentation it's better to run the two
    instances on separate disks for performance reason. I'm trying to understand
    how exactly does the disk I/O affect the postfix performance? By speed
    (bytes per second) or activities (# of read/write per second)?

    Let's say I have two hard disks. If I make a RAID0 array out of the two
    disks the overall speed is twice as the speed of a single drive (I know it's
    not exact twice the speed. just simplify it for discussion). If the postfix
    performance depends on the disk speed then running two instances on two
    separate disks or running two instances on one RAID0 array should not make
    big difference, right? But if it depends on disk activities then running on
    two separate disks is definitely better. I know no matter which case using
    two disks is the choice. But if I have other reason to use RAID0 I just want
    to know how much performance I lost in postfix?

    Thanks

    -Irvin


  • Next message: Sahil Tandon: "Re: Add X-Envelope From/To into incoming mail"





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