RAID 5+1 and BAARF
- From: ryan_gaffuri@xxxxxxxxxxx
- To: oracle-l@xxxxxxxxxxxxx
- Date: Mon, 30 Oct 2006 20:05:22 +0000
I am more on the development side, so I have very little experience with
hardware. I have read the articles on BAARF. I directly our infrastructure guy
to the webpage and he is looking at it. Here is an email I got from him. Is
there ever a cause to use RAID 5?
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Using RAID1 or RAID10 would increase the cost of the company SAN by atleast a
factor of 3.
I worked on this two years ago, so the information below is 2 years old.
In SAN (EMC or Hitachi arrays) the issues pointed out by Milsap and others are
avoided as follows, keeping the cost low:
- There are spare disks on the array. The array takes care of automatically
replacing a bad disk in the stripe set thus keeping the "reduced performance
duration", that to a minimal.
- With lot of cache, fiber backplane and parallel writes to stripes, the "four
I/O operations per read/write" issue is mitigated.
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