Re: Is it possible to support a sector size 8192
Jay Denebeim wrote: In article [EMAIL PROTECTED], Johann Hanne [EMAIL PROTECTED] wrote: 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'm a little confused here. Tape devices have variable sector sizes. I believe they're required to handle up to 64K in a unix environment. The drives I work on go up to 256k. Tapes are different. The UDO drive that Johann was asking about is an optical _disk_ drive... -- Steve McIntyre, Cambridge, UK.[EMAIL PROTECTED] Support the Campaign for Audiovisual Free Expression: http://www.eff.org/cafe/ - To unsubscribe from this list: send the line unsubscribe linux-scsi in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Is it possible to support a sector size 8192
On Mon, 25 Jul 2005, Steve McIntyre wrote: Jay Denebeim wrote: 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'm a little confused here. Tape devices have variable sector sizes. I believe they're required to handle up to 64K in a unix environment. The drives I work on go up to 256k. Tapes are different. The UDO drive that Johann was asking about is an optical _disk_ drive... Yeah, I got that. I wasn't going to say anything until he mentioned using the tape driver with it. Is the UDO drive presenting itself as a tape or as a disk? Jay -- * Jay Denebeim Moderator rec.arts.sf.tv.babylon5.moderated * * newsgroup submission address: [EMAIL PROTECTED]* * moderator contact address:[EMAIL PROTECTED]* * personal contact address: [EMAIL PROTECTED] * - To unsubscribe from this list: send the line unsubscribe linux-scsi in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Is it possible to support a sector size 8192
I'm a little confused here. Tape devices have variable sector sizes. I believe they're required to handle up to 64K in a unix environment. The drives I work on go up to 256k. Tapes are different. The UDO drive that Johann was asking about is an optical _disk_ drive... Hmm... would it be _possible_ to support it as tape device (/dev/st* and /dev/nst*)? Cheers, Johann - To unsubscribe from this list: send the line unsubscribe linux-scsi in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Is it possible to support a sector size 8192
Jay Denebeim wrote: On Mon, 25 Jul 2005, Steve McIntyre wrote: Jay Denebeim wrote: I'm a little confused here. Tape devices have variable sector sizes. I believe they're required to handle up to 64K in a unix environment. The drives I work on go up to 256k. Tapes are different. The UDO drive that Johann was asking about is an optical _disk_ drive... Yeah, I got that. I wasn't going to say anything until he mentioned using the tape driver with it. Is the UDO drive presenting itself as a tape or as a disk? It's a disk, SCSI type 7 (optical). The tape thing is a red herring, IMHO. -- Steve McIntyre, Cambridge, UK.[EMAIL PROTECTED] You lock the door And throw away the key There's someone in my head but it's not me - To unsubscribe from this list: send the line unsubscribe linux-scsi in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Is it possible to support a sector size 8192
In article [EMAIL PROTECTED] you write: I'm a little confused here. Tape devices have variable sector sizes. I believe they're required to handle up to 64K in a unix environment. The drives I work on go up to 256k. Tapes are different. The UDO drive that Johann was asking about is an optical _disk_ drive... Hmm... would it be _possible_ to support it as tape device (/dev/st* and /dev/nst*)? Not that I'm aware, no. It's not designed to be used as a tape at all. To be honest, if you want a device that looks like a tape, then... :-) -- Steve McIntyre, Cambridge, UK.[EMAIL PROTECTED] Into the distance, a ribbon of black Stretched to the point of no turning back - To unsubscribe from this list: send the line unsubscribe linux-scsi in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Is it possible to support a sector size 8192
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). Cheers, Johann - To unsubscribe from this list: send the line unsubscribe linux-scsi in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Is it possible to support a sector size 8192
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... -- Steve McIntyre, Cambridge, UK.[EMAIL PROTECTED] Because heaters aren't purple! -- Catherine Pitt - To unsubscribe from this list: send the line unsubscribe linux-scsi in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Is it possible to support a sector size 8192
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... Wouldn't it be possible to translate the sector size 2:1? For me, it doesn't seem that hard to do. But then again, I usually program other things than the kernel :) -- Regards, Christian Iversen - To unsubscribe from this list: send the line unsubscribe linux-scsi in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Is it possible to support a sector size 8192
we've started shipping a userland filesystem driver for UDO based on FUSE. How does the userland filesystem driver talk to the device? - To unsubscribe from this list: send the line unsubscribe linux-scsi in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
