9track on 3b2
452is-Wolford
wolfordj at ihlpy.ATT.COM
Wed Jun 28 08:51:01 AEST 1989
>From article <125 at bdofed.UUCP>, by nickerso at bdofed.UUCP (b):
> Hello World!
> Hi. We're having trouble with backups on a 9track. We have two
> 3b2s (a 622 and a 700). We have the tape unit on the 700 and ethernet
> between the two. We have /dev mounted under RFS on the 622. The problem
> is that the backups are taking FOREVER! (well, almost :-) The backup of
...
...
> Has anyone else had any experience with the 9track on a 3b2? Our
> contacts at AT&T say that the throughput should be much higher. It seems
> that the drive is stopping and starting as it writes (an indication that
> the buffering can't keep up with the drive???) which means it has to back up
> so that it can get the tape to the right speed at the right time. Not exactly
> a time saver!
>
> Bill
>
> nickerso at bdofed
> Etobicoke Board of Education
> 1 Civic Centre Ct, Etobicoke, Ontario
> (416)394-7182
YEP, think of what you are doing. Taking the information off the of the
disk (ie
1 - going through the disk controller,
1A - to the SCSI controller
2 - to the 3B2,
3 - to the networking card
4 - through the network
5 - to the networking card
6 - to the 3B2
7 - to the SCSI controller
8 - and to the 9 track controller
Steps 3 - 6 are removed from the process if you don't have the take mounted
over a lan.
Think about it. Have questions send mail and I will give a more
detailed explaination of "why" this occurs and that little you do
could make the tape drive on the RFS'ed machine to stream.
Jeff Wolford
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