Estimating IOPS

From: NetComrade (netcomrade_at_bookexchange.net)
Date: 12/22/04

  • Next message: Janodia, Mehul: "SDLT 600 on Solaris 8" 
    Date: Wed, 22 Dec 2004 15:27:49 -0500 (EST)
To: sunmanagers@sunmanagers.org

    Reposting from VxVM group.. Let's see how many 'I am on vacation' replies
    I get.

    As you might've seen from my previous posts, we've been trying to get
    A5200's to work w/ Linux. (we have 4 in production, having Oracle running
    on top, each array basically belongs to a server, they're connected to
    hubs, and can failover from server to server)

    Looks like at this point, we'll be looking to replace arrays with
    something else. Since we must shop on a very tight budget, we will most
    likely have to reduce the # of spindles. In order to do that, we'll need
    to figure out current throughput and IOPS of current production usage.

    The most simple way I thought of was to look at
    a) iostat
    b) vxstat

    Vxstat seems to make much more sense, since we'll be getting IOPs per
    volume, which I could store in the database and query for later. Once the
    'max' is determined (let's say over a month), it'll be probably 2x-4x to
    determine 'minimum sustained IO operations per second' for a new disk
    array. The logistics of it are not so straight-forward, I don't think
    vxstat is capable of acting like sar and storing this stuff somewhere, or
    is it?

    Has anyone done an assessement of their current IO needs? Anything else I
    should be looking at? Any (free) tools would do this for me?

    Thanks.
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    sunmanagers mailing list
    sunmanagers@sunmanagers.org
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  • Next message: Janodia, Mehul: "SDLT 600 on Solaris 8"

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