Tanks Rob, You has all the reason. I wait to have helped.
Fernando 2007/2/2, Rob van der Heij <[EMAIL PROTECTED]>:
On 2/1/07, Fernando Gieseler <[EMAIL PROTECTED]> wrote: > I have gotten up to 4000 IO/s in a SGBD Oracle 10G with a partition LVM with > 128 Stripes in both the cases. With MD's and 3 partitions in 3390-3. High I/O rate is not by definition a good thing, considering that Linux can do anywhere between 4 KB and 800 KB in a single I/O. It might imply you break up your I/O's in 1 block per I/O (although with random read that may be your only option). With MDC by default doing track based cache, it would help you get the remaining 14 blocks out of MDC indeed. But doing more data per I/O would have given the same throughput with way less overhead in Linux and z/VM. If your 4000 is taken from Linux as "1K blocks per second" then we're talking different numbers. That might translate to something like 100 SSCH's per second which would be less exciting for 3 FICON channels. And you're right. If you are happy with the configuration, there may not be a need to change it. But knowing whether that configuration would also make others happy is a different question. Rob ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
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