On Tue, Feb 23, 2010 at 1:35 AM, Page, Jeremy <jeremy.page@gilbarco.com> wrote:

I read that, unfortunately I am not at 7.3.2 yet, I do get the counters but the format is a bit old.

My disk utilization rarely goes above 25%

Here's what I see but since I'm not at 7.3.2 the numbers may be misleading, I don't know.

array01*> stats show -p flexscale-pcs
Instance    Blocks Usage   Hit Miss Hit Evict Invalidate Insert

---
     ec0   4194304    90 11733 3479 77 1748         57   2236
     ec1   4194304    38 1203 2275 34   343        401   1748

I'm by no means an expert on any of this and it's the first time I really look at PCS data but it certainly seems like at least the first level of cache (ec0) would help things out with a 90% usage and 11,733 hits but on the other hand a max 25% disk utilization doesn't seem very high to me. You also mentioned to me that your cache age is a fairly good size too. So, I'm not really sure. It certainly doesn't seem like a PAM card would hurt, that's for sure.

If the only thing noticing a performance issue is the Oracle DB you might want to look at the latency on those volumes.

stats show -i 3 volume:*:avg_latency

or using Performance Advisor.

Romeo