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Message-ID: <38F7D19E.411F4960@interlog.com> Date: Fri, 14 Apr 2000 22:19:10 -0400 From: Douglas Gilbert <dgilbert@interlog.com> MIME-Version: 1.0 To: Jim Hammack <HammackJ@navo.navy.mil> Cc: linux-scsi@vger.rutgers.edu Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Jim Hammack wrote: > > How can I read > 32 Kbytes from a generic scsi device? I am running > kernel 2.2.13 and using a Sony SDT-9000 DAT drive. I have data tapes > with a 40960 byte block size. I can read these tapes okay on an SGI > under IRIX 6.5, but under Linux I only get 32K bytes. Strange. It should work. Another thing that occurs when 32KB is exceeded (due to the setting of SG_SCATTER_SZ) is scatter gather. This would suggest there is something wrong with the SCSI adapter or driver. [kernel version and adapter?] To test this theory you could increase SG_SCATTER_SZ (in sg.h) to 64 KB and rebuild sg. > I have tried setting the block size with mt: > > mt -f /dev/st1 setblk 40960 > > with no effect. I have tried using ioctl to set SG_SET_RESERVED_SIZE to > 64K. The ioctl seemed to work and I could use SG_GET_RESERVED_SIZE to > verify it, but still no effect on reading the tapes. Doug Gilbert - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@vger.rutgers.edu
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