Re: Is it possible to support a sector size 8192

[Johann Hanne <jhml@gmx.net>]

Wow, an answer directly from Plasmon, that's nice. :-)

I've already got the FUSE driver (udofs-1.1-92.i386.rpm, based on FUSE 1.4, is 
this current?!). It is nice for a standalone drive, but we use a SCSI robotic 
changer in conjunction with an HSM system (Legato DiskXtender 2.9) which 
needs some kind of direct access to the drive. It probes for /dev/nst*, but I 
guess /dev/sd* would also work.

I know this exact configuration is not officially supported, but I'm a bit 
dissapointed that the limiting factor seems to be the Linux kernel. If I 
don't find a solution, it will probably become a Solaris/SPARC solution next 
week. :-(

Cheers, Johann



On Friday 22 July 2005 20:18, Steve McIntyre wrote:
> Johann wrote:
> >Hi everybody,
> >
> >i'm trying to access UDO/WORM mediums (which have a sector size of
> >8192) via a Plasmon UDO drive, but all I get is "unsupported sector
> >size 8192" when I try to access it via /dev/sdX. drivers/scsi/sd.c
> >suggests that the maximum sector size currently supported by Linux is
> >4096.
> >
> >How difficult will it get to support 8192? Maybe we can pay somebody
> >for doing it? (Kernel 2.4.21, RHEL 3.1).
>
> We (at Plasmon) investigated adding support in the kernel, but gave up
> quickly as it looked like it would need a huge amount of work in
> multiple areas. Instead, we've started shipping a userland filesystem
> driver for UDO based on FUSE. If you'd be interested in that, let me
> know...