Re: downgrading
2003-02-20 16:19:11
On Thu, 20 Feb 2003 at 2:47pm, rwong AT mrs.mni.mcgill DOT ca wrote
> Another observation I noticed while examining the backups from 3-4 days
> ago.
>
> It appears that the first tape does contain data. The only spot that
> doesn't have data is file 1. The tape header is there, file n >= 2 appear
> to all contain backups. This would explain why the subsequent tapes may
That's normal. File 1 is the tape label. Files 2+ are backups, the first
32k of which is the header.
In looking over the script of unix tool use you sent, there are a lot of
typos. I'm not sure if that's just in the transfer or what, but the
commands you want to run are:
mt fsf 1 (gets you to start of first backup image)
dd if=/dev/nst0 of=backup.image bs=32k skip=1
That will put the (tarball/dump image) in backup.image after skipping over
the amanda header. Subsequent runs of dd will do the same for each
successive image.
> end up empty, because (according to amtoc) it attempts to write that huge
> file to the 2nd tape to the file 1 marker position which it can't seem to
> do (it as in amanda? the vxa-1 system? I dunno which...).
Every tape should have a label as the first file.
> If I attempt to access file markers greater than 1, I don't have any
> problems and there are no syslog messages. But if i attempt to access
> file 1, it keels over and I get messages in syslog. I guess this is why
> amrestore is crapping out. This is good in the sense that the backups are
> occurring. But the amanda is setup to dump the smallest filesystems first
> and then the largest. which means the level 0 dumps for 2-3 file systems
> aren't happening.
>
> Would 2.4.4p1 actually help?
>
> I am going to try tarring to a blank tape manually and see what happens.
This will answer the question regarding 2.4.4b1. Make sure to tar
multiple times.
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
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