* RAIT device driver feasibility
@ 2005-01-13 15:42 Ludovic Drolez
2005-01-13 15:41 ` Alan Cox
0 siblings, 1 reply; 4+ messages in thread
From: Ludovic Drolez @ 2005-01-13 15:42 UTC (permalink / raw)
To: linux-kernel
Hello,
I'd like to know if it's easy to write a RAID like device for tapes (RAIT)...
For block devices, hooks are present in the kernel code, but for char devices,
is there a way to implement a write function for example, which will write in
parallel to N /dev/stX tape devices ?
RAIT already exists in Amanda, in user space, but I'd like to see a generic
kernel RAIT driver which could be used by any backup program.
Cheers,
--
Ludovic DROLEZ Linbox / Free&ALter Soft
152 rue de Grigy - Technopole Metz 2000 57070 METZ
tel : 03 87 50 87 90 fax : 03 87 75 19 26
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: RAIT device driver feasibility
2005-01-13 15:42 RAIT device driver feasibility Ludovic Drolez
@ 2005-01-13 15:41 ` Alan Cox
2005-01-13 17:09 ` Ludovic Drolez
0 siblings, 1 reply; 4+ messages in thread
From: Alan Cox @ 2005-01-13 15:41 UTC (permalink / raw)
To: Ludovic Drolez; +Cc: Linux Kernel Mailing List
On Iau, 2005-01-13 at 15:42, Ludovic Drolez wrote:
> RAIT already exists in Amanda, in user space, but I'd like to see a generic
> kernel RAIT driver which could be used by any backup program.
Why kernel space - why not a user space shared library you can add to
other tape apps?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: RAIT device driver feasibility
2005-01-13 15:41 ` Alan Cox
@ 2005-01-13 17:09 ` Ludovic Drolez
2005-01-13 16:29 ` Alan Cox
0 siblings, 1 reply; 4+ messages in thread
From: Ludovic Drolez @ 2005-01-13 17:09 UTC (permalink / raw)
To: Alan Cox; +Cc: Linux Kernel Mailing List
Alan Cox wrote:
> On Iau, 2005-01-13 at 15:42, Ludovic Drolez wrote:
>
>>RAIT already exists in Amanda, in user space, but I'd like to see a generic
>>kernel RAIT driver which could be used by any backup program.
>
>
> Why kernel space - why not a user space shared library you can add to
> other tape apps?
A shared library which would override read(), write() in the program ? Why not...
But do you think you can chain/bounce, ioctl(), read(), writes from a char
driver to another ?
Regards,
--
Ludovic DROLEZ Linbox / Free&ALter Soft
152 rue de Grigy - Technopole Metz 2000 57070 METZ
tel : 03 87 50 87 90 fax : 03 87 75 19 26
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: RAIT device driver feasibility
2005-01-13 17:09 ` Ludovic Drolez
@ 2005-01-13 16:29 ` Alan Cox
0 siblings, 0 replies; 4+ messages in thread
From: Alan Cox @ 2005-01-13 16:29 UTC (permalink / raw)
To: Ludovic Drolez; +Cc: Linux Kernel Mailing List
On Iau, 2005-01-13 at 17:09, Ludovic Drolez wrote:
> > Why kernel space - why not a user space shared library you can add to
> > other tape apps?
>
> A shared library which would override read(), write() in the program ? Why not...
>
> But do you think you can chain/bounce, ioctl(), read(), writes from a char
> driver to another ?
I was thinking more of an easy to use shared library and adapting the
various tape archiving apps to be able to use it, not emulation
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-01-13 17:51 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2005-01-13 15:42 RAIT device driver feasibility Ludovic Drolez
2005-01-13 15:41 ` Alan Cox
2005-01-13 17:09 ` Ludovic Drolez
2005-01-13 16:29 ` Alan Cox
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