Bug 17401 - RAID1 should improve read performance
Summary: RAID1 should improve read performance
Status: RESOLVED DUPLICATE of bug 25272
Alias: None
Product: IO/Storage
Classification: Unclassified
Component: MD (show other bugs)
Hardware: All Linux
: P1 enhancement
Assignee: io_md
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-08-30 06:52 UTC by poletti.marco
Modified: 2012-08-13 16:01 UTC (History)
2 users (show)

See Also:
Kernel Version: 2.6.34
Subsystem:
Regression: No
Bisected commit-id:

Attachments
Add an attachment (proposed patch, testcase, etc.)

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 ***
Note You need to log in before you can comment on or make changes to this bug.