Bug 771655

Summary: USB external hard disk drive cannot transfer big data
Product: [Fedora] Fedora Reporter: Takayuki Ogawa <takayuki988>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED CURRENTRELEASE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 16CC: gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-01-26 21:20:26 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description Takayuki Ogawa 2012-01-04 13:41:13 UTC 
Description of problem:
When I use dd command as
dd if=/dev/sdb1 of=/dev/null
(/dev/sdb is a 250GB USB HDD),
the data is transferred without problem till the transferred data reaches about 70GB,
but the command tried reading more data, the transfer speed is gradually decreased, and finally the process could not complete to read the whole data.
I tried the above command on other computer and other USB HDD with Fedora 16, but the result was same.
This command was succeed when I used recovery mode of Fedora 15's installation disk.

Version-Release number of selected component (if applicable):
kernel-3.1.6-1.fc16.x86_64

How reproducible:
Everytime.

Steps to Reproduce:
1. Attach USB harddrive.
2. Read big data (more than 70GB) such as the whole partition by dd command.
  
Actual results:
Whole partition cannot read from the disk because the transfer speed is gradually decreasing and become too slow.

Expected results:
Whole partition is completely readable by almost stable transfer speed.

Additional info:
Attaching result of lspci and lsusb of both two PCs.
Comment 1 Takayuki Ogawa 2012-01-26 21:20:26 UTC 
This bug seems to be fixed in 3.2.1-3.fc16.x86_64.
Thank you.