Just a guess -- but I'd ignore the FC transfer size and use a device blocksize of 128K or 256K (can't remember off the top of my head what LTO uses as a maximum). The FC transport layer should split/reassemble the blocks with no problem. For example, our SAP database is FC attached and Oracle is configured to use an 8K blocksize for all disk I/O -- and that's been working for several years now.
Tom Kauffman NIBCO, Inc > -----Original Message----- > From: Lars Bebensee [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, August 13, 2002 9:24 AM > To: [EMAIL PROTECTED] > Subject: Tape Performance on 3580 > > > Hi guys, > > this is actually not a TSM question but one for the hardware > gurus. We are > running a backup under AIX using the savevg command and > Ultrium 3580 tape > drives. With topas I can see a data transfer rate of about 1MB/sec. We > attached the drives via Fibre Channel and a SAN Data Gateway. > The blocksize > of the drive was set to 2048 (since one of the SAN guys told me FC > transfers with a blocksize of 2048). I started savevg with > "-b4" meaning to > write 4x512Byte blocks (=2048). With the mentioned speed the > drives are > seriously crawling. Am I missing out something here? Any clues?? > > Thanks > > Lars >
