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

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

My Perl is REAL rusty, can anyone tell me what to change in flexbackup
to get it to change from:
 cpio -t -v -C 32768

to
cpio -t -v --block-size=64


Thanks ahead of time for any help,
Luis.


-----Original Message-----
From: fle...@li...
[mailto:fle...@li...] On Behalf Of Luis
Cortes
Sent: Monday, February 17, 2003 11:08 AM
To: fle...@li...
Subject: Re: [flexbackup-help] Version 1.01 and mt setblk in Linux


Okay here is the error I get:



flexbackup version 1.0.1 (http://flexbackup.sourceforge.net)
/etc/flexbackup.conf syntax OK

|------------------------------------------------------------
| Checking /bin/sh on this machine... bash2
|------------------------------------------------------------
| Logging output to "flexbackup.list.200302171143.log"
| Trying "mt defblksize" instead of "mt setblk"
| Reading from current tape position
|------------------------------------------------------------
At block 134227397.
|------------------------------------------------------------
| dd ibs=32k obs=32k conv=noerror,sync if="/dev/nst0" | cpio -t -v -C 
|32768
|------------------------------------------------------------
1+0 records in
1+0 records out
cpio: premature end of archive
|------------------------------------------------------------
At block 134227401.
|------------------------------------------------------------


When I change the cpio command to block-size=64 instead of C, then it
works:

cpio -t -v --block-size=64


I think it is just my tape is real finicky about blocks.

I guess I will need to do with same with gzip.



----- Original Message -----
From: "Edwin Huffstutler" <ed...@co...>
To: "Luis Cortes" <ad...@co...>
Cc: <fle...@li...>
Sent: Sunday, February 16, 2003 8:37 AM
Subject: Re: [flexbackup-help] Version 1.01 and mt setblk in Linux


>
> [ Luis Cortes wrote: ]
> > 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,
>
> Nope.
>
> tar and many others default to 10k.  cpio does default to 512 bytes.  
> We don't use defaults for anything anyway, so it doesn't matter.
>
> > 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?
>
> Nope.
>
> The config file says "Block size (k)" for $blksize, and that's what it

> means.  It's converted for whichever archiver as needed.
>
> Flexbackup sets the flags are all set so units are consistent.  Check 
> the manpages and code.
>
>
> tar:
>   -b, --block-size N
>          block size of Nx512 bytes (default N=20)
>
> cpio: (flexbackup uses the -C flag!)
>   -C IO-SIZE, --io-size=IO-SIZE
>         Set the I/O block size to IO-SIZE bytes.
>
> dump:
>   -b blocksize
>              The number of kilobytes per dump record.  Since the IO
system
>              slices all requests into chunks of MAXBSIZE (typically 
> 64kB),
it
>              is not possible to use a larger blocksize without having
problems
>              later with restore(8).  Therefore dump will constrain 
> writes
to
>              MAXBSIZE.  The default blocksize is 10.
>
> afio:
>   -b size      Read  or write size-character archive blocks.  Suffices
of
>                b,  k,  m  and  g  denote  multiples  of  512,
kilobytes,
>                megabytes  and  gigabytes, respectively.  Defaults to
5120
>                for compatibility with cpio(1).  In  some  cases,
notably
>                when  using  ftape with some tape drives, -b 10k is
needed
>                for compatibility.  Note that -b 10k is the default
block
>                size used by tar(1), so it is usually a good choice if
the
>                tape setup is known to work with tar(1).
>
> etc..
>
> --
>  Edwin Huffstutler     Linux - because reboots are for hardware
changes
>  ed...@co...   GnuPG Key ID: AE782DC9
>
>
>



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