Add set bad lba function in md-faulty module.

Add set bad lba function in md-faulty module.

[kedacomkernel]

Hi all:
	In order to test md code, sometime we need  simulate read/write harddisk error.
	Using hdparm --make-bad-sector to  simulate  read error.But I did not find way of  simulating write-error.
	I tested md-faulty module, it can do this.But it is not provide the function link hdparm --make-bad-sector,which did not set lba.
	Using hdpamr --make-bad-sector to  simulate read error can cause some problem.
	It will cause ata commnd reset,disk reset and so on.It take too log time.
	So I think add a function in md-faulty which can set read/write lba.
	How about ?
																				
 				
--------------
kedacomkernel
2012-05-14

Re: Add set bad lba function in md-faulty module.

[NeilBrown]

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On Mon, 14 May 2012 18:22:25 +0800 "kedacomkernel" <kedacomkernel@gmail.com>
wrote:

> Hi all:
> 	In order to test md code, sometime we need  simulate read/write harddisk error.
> 	Using hdparm --make-bad-sector to  simulate  read error.But I did not find way of  simulating write-error.
> 	I tested md-faulty module, it can do this.But it is not provide the function link hdparm --make-bad-sector,which did not set lba.
> 	Using hdpamr --make-bad-sector to  simulate read error can cause some problem.
> 	It will cause ata commnd reset,disk reset and so on.It take too log time.
> 	So I think add a function in md-faulty which can set read/write lba.
> 	How about ?

I don't know how --make-bad-sector works so it might not be possible to get
md to respond to the same command.  But if it can work it sounds like a good
idea.

Patches welcome.

NeilBrown


>  				
> --------------
> kedacomkernel
> 2012-05-14
> 
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Add set bad lba function in md-faulty module.

[majianpeng]

Hi all:
	In order to test md code, sometime we need  simulate read/write harddisk error.
	Using hdparm --make-bad-sector to  simulate  read error.But I did not find way of  simulating write-error.
	I tested md-faulty module, it can do this.But it is not provide the function link hdparm --make-bad-sector,which did not set lba.
	Using hdpamr --make-bad-sector to  simulate read error can cause some problem.
	It will cause ata commnd reset,disk reset and so on.It take too log time.
	So I think add a function in md-faulty which can set read/write lba.
	How about ?
											
 				
--------------
majianpeng
2012-05-15

Re: Add set bad lba function in md-faulty module.

[George Shuklin]

On 15.05.2012 15:49, majianpeng wrote:
> Hi all:
> 	In order to test md code, sometime we need  simulate read/write harddisk error.
> 	Using hdparm --make-bad-sector to  simulate  read error.But I did not find way of  simulating write-error.
> 	I tested md-faulty module, it can do this.But it is not provide the function link hdparm --make-bad-sector,which did not set lba.
> 	Using hdpamr --make-bad-sector to  simulate read error can cause some problem.
> 	It will cause ata commnd reset,disk reset and so on.It take too log time.
> 	So I think add a function in md-faulty which can set read/write lba.
> 	How about ?
> 											
>   				
How about using an iscsi at localhost? Export disk via ISCSI target, 
connect to it with initiator. With iptables and open-iscsi settings you 
can precisely control error behavior and imitate all kinds of errors 
(including timeouts).