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Oracle Tips by Burleson |
Disk I/O Tuning
Chapter 4:
RAID—Redundant Arrays of Inexpensive Disks
load balancing,
but write performance suffers due to RAID 6 requiring more
writes than RAID 5 for data update.
For
the money, I would suggest RAID0/1 or RAID1/0, that is, striped and
mirrored. It provides nearly all of the dependability of RAID5 and
gives much better write performance. You will usually take at least
a 20 percent write performance hit using RAID5. For read-only
applications RAID5 is a good choice, but in
high-transaction/high-performance environments the write penalties
may be too high. Figure 4-3 shows RAID 1-0 or 0-1 depending on
whether you stripe and then mirror or mirror first and then stripe.
In most situations you get better performance from RAID 1-0
(mirroring then striping.)
Figure 4-3: Mirroring
and Striping
The above text is
an excerpt from:
Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle
Databases
ISBN
0-9745993-4-4
by Mike Ault
Oracle Consulting
Services
Burleson
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