OnTap 8.1.2p1

Our DBA's are complaining that our nSeries (N3220/FAS2240) is reading really slow due to it only returning small 16k blocks. The DBA's are saying the Oracle multi-block read ahead should be reading 128 x 16k blocks = 2m read, but it's only seems to be reading/returning 16k at a time.

On a AIX filesystem mounted CIO, if I run

"dd if=/dev/zero of=z bs=1m count=9999"

I see writes of 500k.

In the same filesystem mounted CIO, if I read an existing db file

"dd if=<dbfile> of=/dev/null bs=1m"

I see reads of up to 30k.

Q) Is there a limit in OnTap on read size?

Thanks

Rick

The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message.