Re: 3Ware 7500-4 Slow

From: Francisco (francisco_at_natserv.net)
Date: 09/23/05

  • Next message: Shanker Balan: "Re: Finding what's causing I/O" 
    Date: Thu, 22 Sep 2005 22:13:59 -0400 (EDT)
To: Chuck Swiger <cswiger@mac.com>

    On Mon, 5 Sep 2005, Chuck Swiger wrote:

    > Small writes are pretty much the worst-case scenario for RAID-5,

    Such as mail servers?
    How about for a DB server which is mostly read only?

    > normal to see a very significant performance drop-- by up to an order of
    > magnitude-- from the performance of a bare drive.

    At which point Raid 5 starts to perform better?
    6,8,10 drives?

    How about RAID 10 for a DB server?
    I have been trying to convince the "powers that be" that SCSI would be
    much better.. but the price difference is just too astronomical for the
    capacities we need (500GB to 2 TB)

    Even 10K RPM IDE drives seem like would be a problem since they are mostly
    small in size.
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  • Next message: Shanker Balan: "Re: Finding what's causing I/O"

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