Re: [flexbackup-help] Version 1.01 and mt setblk in Linux

[Luis C. <ad...@co...>]

Okay, let me clarify my own response.  I believe that for programs like tar
or cpio, the default block size is 512.  When you specify 64 blocks,
flexbackup thinks it's 1024 * 64.  If you specify 64 blocks for cpio it
means 512 * 64.  It seems to me that there is a logic problem somewhere.  Am
I right about this?



----- Original Message -----
From: "Luis Cortes" <ad...@co...>
To: <fle...@li...>
Sent: Saturday, February 15, 2003 8:16 PM
Subject: Re: [flexbackup-help] Version 1.01 and mt setblk in Linux


> I have been having a similar problem.  I haven't tried this fix yet, but I
> hope this does it for me.
>
> My problem is that I set the default to 64 blocks.  I am guessing that the
> default block size is 512 bytes.  But when I try to list anything, it
either
> says something about the first block all null or that the archive is not
> correctly terminated and false to list anything.
>
>
>
> ----- Original Message -----
> From: "Edwin Huffstutler" <ed...@co...>
> To: "Douglas Bollinger" <dc...@sd...>
> Cc: <fle...@li...>
> Sent: Saturday, February 15, 2003 2:22 PM
> Subject: Re: [flexbackup-help] Version 1.01 and mt setblk in Linux
>
>
> >
> > [ Douglas Bollinger wrote: ]
> > > I've been using the flexbackup script for a long time.  Love it!
> >
> > Thanks!
> >
> > > In the latest update, my system has been having trouble,
> >
> > (Strange, as recent changes haven't touched mt blocksize that I recall)
> >
> > > I need to have blocks set to 512, but the script takes the 512*1024.
> This
> > > doesn't work for me.  Output of the flexbackup error:
> > >
> > > Neither of these commands worked:
> > >   mt -f /dev/nst0 setblk 524288
> > >   mt -f /dev/nst0 defblksize 524288
> > >
> > > But, if I do this manually:
> > >
> > > rodan:~# mt -f /dev/nst0 setblk 524288
> > > mt: /dev/nst0: Input/output error
> > > rodan:~# mt -f /dev/nst0 setblk 512
> > > rodan:~#
> > >
> > > You can see, I need the blocks in k's, not multiplied by 1024.  In the
> > > script I had to change line 2251:
> > >
> > > #   $main::mt_blksize = $cfg::blksize * 1024;
> > >     $main::mt_blksize = $cfg::blksize;
> > >
> > > And now it works.
> >
> >
> > I bet you can set $blksize=1 and you'd be fine.  A multiple of the
> > hardware block size is OK in my experience and testing.
> >
> > I think the problem you ran into is that 512k is huge and over a limit
> > somewhere.
> >
> > Also, does $mt_var_blksize='true' work for you?  That's more often
> > recommended and is easier than trying to find the right blocksize for
your
> > tape drive.
> >
> > At any rate, please report back.  I may need to adjust so non-multiples
of
> > 1024 bytes can be used.
> >
> >
> > Thanks,
> >   -Edwin
> >
> >
> > --
> >  Edwin Huffstutler     Linux - because reboots are for hardware changes
> >  ed...@co...   GnuPG Key ID: AE782DC9
> >
> >
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