Oracle 11g DW - RAID5 or RAID1 + 0?

Hi all

For an implementation of DWH Oracle 11 g, what drive arrangement is preferable, if only load & the data query performance are taken into account: RAID1 + 0 or RAID5?

In addition, only RAID5 also automatically given stripe (i.e. RAID5 = RAID5 + 0)?

Ofcourse RAID5 will protect only against a single disk failure (in the case of no help). with RAID1 + 0 protection against multiple disk failures.

Please tell us what is the preferred option.

OracleDisciple wrote:
As this would be an implementation of the warehouse with loading data pure data per day during off-peak hours and sessions of massive request for the rest of the day performed once, RAID5 give equal or slightly lower performance compared to RAID1?

Unknown. How the storage system implements RAID determines productivity. RAID5 can be indeed not faster than RAID10 if RAID5 is made for a better storage system architected and RAID10.

The coefficient of basis (con), making it the most expensive RAID5 is calculation of parity. What makes cheaper RAID10 (pro) is to have a disk mirror set (and a whole bunch of disk controllers extra) to maintain the e/s readings.

Modern storage system, there are two features that often deny these pros and cons parity calculations are discharged to the storage group. So write an I/O for RAID5 is fast for RAID10 as the calculation of parity does not affect the waiting time (from the database for example) for that i/o to complete.

The second feature is the in-memory cache. Modern storage systems may have caches of 0.5 to RAM and bigger memory - and the memory are inexpensive, large storage system caches become the norm. This means that the vast majority of all i/o on the storage system may be against the cache memory - so little time spend waiting for disks to towers.

Recommendation of Oracle is SAMI - Stripe and mirror everything. This is mentioned in the Metalink, books of kitchen CARS and best practices notes and so forth. At the same time you can get a white paper from EMC for example, co-written by Oracle Corp., proclaiming just how fast and efficient RAID5 on EMC storage array networks are.

So it is more clear and decisive line between different implementations of RAID. We must look at just how the storage array is built and well he is capable of dealing with a specific implementation of RAID.

Tags: Database

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