Bug 17401

Summary:	RAID1 should improve read performance
Product:	IO/Storage	Reporter:	poletti.marco
Component:	MD	Assignee:	io_md
Status:	RESOLVED DUPLICATE
Severity:	enhancement	CC:	alan, justincase
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.34	Subsystem:
Regression:	No	Bisected commit-id:

Description poletti.marco 2010-08-30 06:52:07 UTC

When using RAID1 on 2 drives, write performance must be about the same as a single drive, but read performance can (theoretically) double, distributing reads on both drives.

This has probably already been reported by someone.
I tried searching in the old bugs but I didn't find anything related.

See this discussion:
http://www.tomshardware.co.uk/forum/250390-14-does-raid-increase-read-speed

They say this optimization is already implemented in BSD and some high-end RAID cards.

Comment 1 Yill Din 2011-02-17 02:09:45 UTC

Duplicate of #25272

Comment 2 Alan 2012-08-13 16:01:05 UTC


*** This bug has been marked as a duplicate of bug 25272 ***