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Home -> Community -> Usenet -> c.d.o.server -> Re: Which oracle server ?
Howard J. Rogers wrote:
>> You don't want to use raid 5.
Source:
http://download-west.oracle.com/docs/cd/B14117_01/server.101/b10752/iodesign.htm#26022
Quote:
"Avoiding the use of RAID 5 for redo logs."
Source:
http://download-west.oracle.com/docs/html/B13831_01/tuning.htm#sthref531
Quote:
"Striping data across a number of disks is one example of a redundant
array of inexpensive disks (RAID). There are several different types of
RAID, also referred to as RAID levels, ranging from high performance to
high reliability. The three most common RAID levels in Oracle Database
installations are RAID-0, RAID-1, and RAID-5. Descriptions of each RAID
level follow Table 7-2, which shows each level's read and write penalties.
RAID Level Read Penalty Write Penalty 0 (Disk Striping) 1:1 1:1 1 (Disk Mirroring) 1:1 2:1 0 + 1 1:1 2:1 5 (Distributed Data Gathering) 1:1 4:1".. and ..
Source:
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96533/iodesign.htm#22610
Quote:
"RAID 0+1: Striping and Mirroring
This level combines the technologies of RAID 0 and RAID 1. It is widely
used because it provides good reliability and better read and write
performance than RAID 1."
and
"RAID 5 striping is similar to striping in RAID 0 ... while write
performance can suffer. This configuration might not be ideal for
write-intensive applications."
You are, of course, correct as always and I have obviously misunderstood. Thank you, in advance, for correcting both me and Oracle.
-- Daniel A. Morgan University of Washington damorgan_at_x.washington.edu (replace 'x' with 'u' to respond)Received on Sun Dec 12 2004 - 23:02:17 CST
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