Precision on "Write Intensive" applications

Hi,
We dont have experience with Oracle so far.
From Oracle faq, I saw the information "...RAID 5 is good for read intensive, but not write intensive applications."
What is write intensive application? We are planning to have 200-300 mb of transactions per day in a database.
Thanks.
Claude

this is a topic that generates significant debate. based on my experiences, the oracle documentation i have read, and input from large disk manufacturers, i generally recommend raid-1 for many of the reasons mentioned in the previous response.
databases typically use random, low-block-size (16k and under) i/o that is better suited for raid-1. raid-5 excels in highly sequential, large block size operations. even though raid-1 "costs" more in acquisition cost, i believe the relatively low cost of disk storage is worth the extra price in terms of the performance benefit you will receive (in both normal and in degraded modes) for larger, higher volume databases.
no matter what raid mode you use, most raid controllers allow you to enable write caching, which can speed the performance of write operations. make sure you have battery backup on your hardware if you enable this option.
another very important factor you should address is the distribution of your raid arrays over multiple host channels. this means that you should not hang all of your oracle data off of a single scsi or fiber disk bus. distributing your data over multiple buses also opens up the ability to store frequently-accessed data on faster disk. so you could use a combination of raid-1 and raid-5 if you wanted to compromise. but you always have to be monitoring the i/o performance of your hardware and database, so you can balance the i/o appropriately.

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