[79] in Athena_Backup_System
Re: Tape layout
daemon@ATHENA.MIT.EDU (Jonathon Weiss)
Tue Feb 14 16:06:56 1995
To: dkk@MIT.EDU
Cc: delgado@MIT.EDU, jweiss@MIT.EDU, athena-backup@MIT.EDU
In-Reply-To: Your message of "Thu, 09 Feb 1995 15:36:07 EST."
<9502092036.AA21036@imbrium.MIT.EDU>
Date: Tue, 14 Feb 1995 16:06:03 EST
From: Jonathon Weiss <jweiss@MIT.EDU>
>> Jonathon> int timestamp; /* UNIX timestamp of the date the last write operation began */
>>
>> So, you're proposing to have the tape label rewritten at the beginning
>> of the tape after the rest of the tape has been written? I don't know
>> how many tape drives that will work with, and it sure won't work with
>> a WORM drive (like a CD-Recordable drive). Do we need the last-write
>> time, as opposed to the start-time for the most recent tape use?
I know we tlaked about this at last week's meeting, but for the
record... The point I was trying to get accross in the comment was
that the label would be re=written at at the beginning of the job.
(ie. read tape label, rewind tape, write tape label, write 1st vol.,
write 2nd vol., ..., write last vol., rewind tape, take tape offline.)
I also plan to add a second int for the timestamp that can be more
precise than seconds.
Jonathon
