--On Tuesday, August 27, 2002 10:28:02 -0400 Jon LaBadie <[EMAIL PROTECTED]> wrote:
> Has anyone else noted this behavior? > "mt rewind" returns (completes) before tape is rewound Yes, it seems to be fairly a common behavior of tape drives. Back in the days when I had to write shell scripts to do backups, I always threw in a sleep call after any tape command. Not all commands needed it, but wasting a few seconds on a several hour job was much better than the random error that would cause the entire job to fail. Frank > > Specifically, > > When I issue an "mt rewind" from a shell command line, > the tape begins to rewind (lights on drive blinking) > and after about 10 seconds the mt command completes > and I get my shell prompt for the next command. > > However, the tape has not yet rewound completely, > the drive lights are still blinking. > > If I issue a second mt command (another rewind or status) > that command blocks until the tape is completely rewound > before executing and returning. > > > I'm wondering if this is why my amcheck command sometimes > fails to find the correct tape in my changer though amdump > always does. Perhaps amcheck does an mt rewind and it > returns before the tape drive is done rewinding. Then > amcheck might issue a command that times-out rather than > blocking and thus amcheck thinks that slot has no or the > wrong tape. > > Just musing. > > -- > Jon H. LaBadie [EMAIL PROTECTED] > JG Computing > 4455 Province Line Road (609) 252-0159 > Princeton, NJ 08540-4322 (609) 683-7220 (fax) -- Frank Smith [EMAIL PROTECTED] Systems Administrator Voice: 512-374-4673 Hoover's Online Fax: 512-374-4501
