Line size test
- From: "Cary Millsap" <cary.millsap@xxxxxxxxxx>
- To: <Oracle-L@xxxxxxxxxxxxx>
- Date: Sun, 12 Sep 2004 22:16:43 -0500
This is a test to determine whether we're gaining way against the line =
size
problems that I've been experiencing in sends to this list. Sorry for =
the
noise...
* * *
The "4W" part of the RAID 5 formula is actually true only for RAID 5 =
groups
larger than 4 disks. On a 3-disk RAID 5 array, for example, both large
writes and small writes will consume only 3W I/O calls (one for each =
disk).
The complete formula is actually R + min(4,G)*W. Since most of you have =
G>3,
the simplified formula that uses '4' as a constant yields the correct
answer.
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