Journaling - Configuring for your Fair Share of Write Cache
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Abstract
Of all the hardware choices you can make, the most influential regarding journal performance is usually the quantity of IOA write cache made available for your journal receivers.
While it is tempting to simply configure as many disk units emanating from an IOA as the surrounding hardware connections will allow, doing so in a journal intensive environment can sometimes be counterproductive. Instead, it is often wiser to refrain from attaching so many disk units to the IOA. By spreading the disk units around across a larger quantity of IOAs, you allow the IOA write-cache to keep up with the journal traffic.
Written by Larry Youngren, Software Engineer IBM Systems &Technology Group, Development iSeries Journaling
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