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тАО12-18-2003 03:58 AM
тАО12-18-2003 03:58 AM
chaining two DLT4000's
My questions are:
Can I daisy chain the 2nd off the first? Both are in a Smart rack (C4318B). From reading the forum it looks like I can.
Can I bring the 2nd DLT up without a reboot?
How to I configure fbackup to use the second tape once the first fills up? We currently have a cron job to run a script that calls fbackup.
Norm
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тАО12-18-2003 04:19 AM
тАО12-18-2003 04:19 AM
Re: chaining two DLT4000's
You may loose in performance. Saying that DLT4000 aren't that fast.
I was always told to keep my backup devices onto different controlers...
I think in fbackup you can specify more than one output file. But I never tried it.
cf. man pages
Jean-Luc
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тАО12-18-2003 06:08 AM
тАО12-18-2003 06:08 AM
Re: chaining two DLT4000's
The transfer rate of the DLT4000 is 1.5MB/s which is substantially slower that a narrow SE (5MB/s) or a narrow Differential (10 MB/s) bus. hooking up the second drive SHOLUD be no problem.
What model is your server, and how are you connected to the drives? Are there any other devices on the SCSI bus? There may be other issues depending on how it is hooked up.
-Josh
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тАО12-18-2003 07:26 AM
тАО12-18-2003 07:26 AM
Re: chaining two DLT4000's
It is not any problem to daisy chain several DLT 4000 on the same SCSI (I have 3 chained myself). fbackup uses the drives sequential so the SCSI bandwith should not be any problem.
Use:
fbackup -f
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тАО12-18-2003 07:29 AM
тАО12-18-2003 07:29 AM
Re: chaining two DLT4000's
The one DLT is connected via a SCSI DF cable to a C87x Fast Wide Diff and its the only unit on that bus.
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тАО12-18-2003 06:07 PM
тАО12-18-2003 06:07 PM
Re: chaining two DLT4000's
It is a workaround, but I don't think it is possible to tell fbackup that the second DLT drive must be used when the first tape is full.
Kurt