24 Mar
2005
24 Mar
'05
2:20 p.m.
Quick check to see if anyone's ever tried this. (where "tried" =
"written some code to do so")
In theory one could hook up a system running linux/*bsd with a SCSI
controller present acting as a target rather than initiator, and have
the machine pretend to be a tape drive, hard disk etc.
I have no idea if the linux / *bsd kernels (or card drivers) support
running as a target, or if the necessary hooks are present into user-
land (eg. via 'sg') to allow user code to do the emulation, though.
Just thought I'd ask if anyone's attempted to do it before...
(personally I can write sg device code, but I'm by no means a kernel
hacker)
cheers
J.
24 Mar
24 Mar
2:36 p.m.
On Thu, 2005-03-24 14:20:40 +0000, Jules Richardson <julesrichardsonuk at
yahoo.co.uk>
wrote in message <1111674040.2356.34.camel at weka.localdomain>:
Linux doesn't feature target mode SCSI, but at some time, there were
at least some patches available for at least some controllers. Some
folks tried to do IP-over-SCSI.
I'm not sure, but I seem to recall that at least one of today's BSDs
ships along with target mode. IIRC it's even used in some embedded
storage systems.
MfG, JBG
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2:57 p.m.
>>>> "Jules" == Jules Richardson
<julesrichardsonuk at yahoo.co.uk> writes:
Jules> Quick check to see if anyone's ever tried this. (where "tried"
Jules> = "written some code to do so")
Jules> In theory one could hook up a system running linux/*bsd with a
Jules> SCSI controller present acting as a target rather than
Jules> initiator, and have the machine pretend to be a tape drive,
Jules> hard disk etc.
Jules> I have no idea if the linux / *bsd kernels (or card drivers)
Jules> support running as a target, or if the necessary hooks are
Jules> present into user- land (eg. via 'sg') to allow user code to
Jules> do the emulation, though.
I've heard of targets for iSCSI, which of course is just SCSI over a
different type of cable. Since a lot of OS (including Linux) support
iSCSI initiators, if you need SCSI emulation without weird hardware
hacking, an iSCSI target may be a good way to go.
I don't have pointers to specific examples handy.
paul
5:28 p.m.
Jules Richardson wrote:
I have *really* wanted to do this to emulate disks for some odd scsi
machines I have (disk which have nonstandard block sizes - don't ask).
I looked really hard and found some things close, but not quite. No
actual code, however.
There was some talk about doing in the linux world. I have not found
anything working, however. I did find a commercial product but I think
it was tape oriented.
Ideally I'd like a linux kernel module which worked with a common scsi
card. I'd be most happy if the module/driver would allow me to write
the actual target code in userland.
Please let me/us know if you find anything. I know it can be done but
don't have the time to write a driver.
I could swear I did see some hacks to a qlogic card which came close.
-brad
25 Mar
25 Mar
3:10 a.m.
I have *really* wanted to do this to emulate disks for
some odd scsi
machines I have (disk which have nonstandard block sizes - don't ask).
It looks like Fujitsu did some work for Linux a couple of years ago.
Other sources claim Linux lacks the target-mode middle layer.
FreeBSD is supposed to be able to do this, however.
De
7326
days inactive
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4 comments
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participants (5)
-
brad＠heeltoe.com -
drb＠msu.edu -
jbglaw＠lug-owl.de -
julesrichardsonuk＠yahoo.co.uk -
pkoning＠equallogic.com