Re: automating tbtape on Informix V5
Please add tbtape info to the FAQ!!!!! If it is in the FAQ, then I must have
overlooked it!
I have not found much info concerning tbtape. The database in question is
my DB. Dana is a in because we (Me and Admin.) have done all we can think
of, so we called the IBM experts (since it is there tape hardware). We
would like to use it with ADSM. Will tbtape (ontape) work with ADSM
on 7.2?
Thanks in advance !!!
-------------------------------------------------------------------------
Cheryl Kendricks
Internet:cherylk@prod1.jcdc.doleta.gov
OR
kendric@gwysmtp.jcdc.doleta.gov
OR
cherylk@spamis.jcdc.doleta.gov
DTSI, Inc. Voice: 1-800-598-5008
Database Administrator - DOL Job Corps San Marcos, Texas
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On 18 Apr 1996, June Tong wrote:
} Dana Lloyd (danal@austin.ibm.com) wrote:
} : Basically V5, aka tbtape, has a hard stop at 2.2GB. That's just the way
} : it is according to Informix.
}
} You have been misinformed. tbtape has a hard limit of 2TB. As far as I know
} (back to 4.x), tbtape has always had a limit of 2TB. I think there may have
} been a bug regarding ULIMIT (something like not resetting ULIMIT if backing up
} to disk), but even these should not affect backup to tape. The other
} limitation on tapesize for archives (besides 2TB) is that some OS flavors will
} count up the amount of data written between an open() and a close(), and since
} this is basically what tbtape uses, on these OS flavors, this can cause tbtape
} to fail at 2GB or 4GB (depending on whether the OS used a signed long or an
} unsigned long).
}
} So if you have a 7GB tape (is that where this originally started? I can't
} even find the original question), and you do NOT use one of those unfriendly
} OS flavors that cut you off at 2GB or 4GB, you can happily set your TAPESIZE
} to 7000000 (kbytes). (Although, we generally recommend setting it a bit lower
} than the advertised size, since tape manufacturers often don't measure very
} well...)
}
} If you remember who at Informix told you this, I'd be happy to set them
} straight :-}
}
} Maybe this should go in the FAQ.
}
} June
}
} ---- June Tong Informix Software ----
} ---- Senior Consultant (415) 926-6140 ----
} ---- International Support junet@informix.com ----
} ---- Location-du-jour: Menlo Park ----
} -
} - Please do not send me requests/questions by mail. When I have the knowledge
} - and time permits, I try to answer questions on comp.databases.informix, but
} - travel schedule, time, and volume make responding to personal requests
} - difficult and often slow. Please call your local Informix Technical Support
} - organization for assistance with technical issues.
}