Do the v$ tables show the hotspots even on a single SAN disk?

Not really. Oracle has no idea about the disk abstration behind the scenes, and that is the problem - how do you match an Oracle datafile to the disks in the SAN?

One of my mates had a huge SAN performance issue at a large site in the UK. They had all the SAN vendor's leading experts working on the problem (even flew in the guru from the US), and everyone was scratching their heads. As a test they set the system up with a single Linux-based PC with dedicated disks. Under load tests it flew. Now I'm not saying that SANs are no good, but they add a huge level of complexity, and you need very sharp in how you architect your solution.

In reply to Re^3: OT: What Hardware is important for large I/O bound processes by astroboy
in thread OT: What Hardware is important for large I/O bound processes by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.