Howdy, I am having problems with very slowing reading from an Ultrium 1 SCSI tape drive (100GB capacity). With the current version of cygwin (and older) the drive is reading less than 200KB/sec using tar, dd and cpio. The drive is capable of reading 16MB/sec. There are no problems with Win2k's NTBackup and an evaluation version of the MKS Tool Kit so this appears to be a problem with cygwin.
The simplest way to see the problem is insert an Ultrium tape - say with the block size 16KB and run these commands with an otherwise quiescent system: mt -f /dev/nst0 setblk 8192 tar -tf /dev/nst0 -b 32 and the SCSI bus activity light flashes about 8 times per second. The hardware is a 1.4GHz AMD Athlon with 512MB memory, Adaptec 2940UW SCSI controller with three SCSI disks and the Ultrium tape drive. cygwin is the current version and win2k Pro has all the current patches according to Windows Update. Block size does not seem to be a factor. I've tried 8k, 16k and 32k (over 32k doesn't work for some reason). I've searched the on the web, the manuals, the FAQ and the cygwin list archive. Just in case it is helpful I've included the output from "mt -f /dev/st0 status 3" after rebooting at the end. Thanks in advance, Bill [EMAIL PROTECTED] ~ $ mt -f /dev/st0 setblk 32768 [EMAIL PROTECTED] ~ $ mt -f /dev/st0 status 3 drive type : 01 (Unknown type of tape device) tape capacity : 102629376 KB remaining : 8861696 KB current file : 0 active partition : 0 current block : 0 cur logical block: 0 General status bits on (45030000): BOT WR_PROT ONLINE IM_REP_EN HW_COMP min block size : 2 max block size : 32768 def block size : 32768 cur block size : 32768 density code : 00 (default) EOT zone size : 0 Drive(r) Capabilities: ---------------------- fixed length blocks : yes var length blocks : yes set block size : yes fixed partitioning : no select partitioning : no initiator partitioning : no get logical blockno : yes logical block spacing : yes get absolute blockno : yes absolute block spacing : yes logical block immediate : yes absolute block immediate : yes relative block spacing : yes backward spacing : yes immediate rewind : yes fast EOM spacing : yes immediate spacing : no write marks immediate : yes filemark spacing : yes write filemarks : yes write long filemarks : no write short filemarks : no report setmarks : no setmark spacing : no write setmarks : no set report setmarks : no sequential filemarks : no sequential setmarks : no load and unload : yes un/load immediate : yes lock and unlock : yes un/lock immediate : no tape retension : no retension immediate : no erase on bop only : no erase immediately : yes long erase : yes short erase : yes sw ejects media : yes report write protection : yes report EOT warn size : yes set EOT warn size : no data padding : no set data padding : no returns capacity : yes returns remaining : yes hw error correction : no set hw error correction : no hw compression : yes set compression : yes set comp. on bop only : no report cleaning request : no -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
