dump-users

[Dump-users] simple question about dumps to regular files

[Brent B. <br...@ke...>]

Suppose I have some dumps that were dumped with '-b64' block size 64KB, 
and they were dumped as regular files to disk.  Now I decide I want to 
send them to tape.  What kind of blocking/reblocking things do I have to 
worry about?  Should I:

cat dumpfile >/dev/nst0

 	or

dd if=dumpfile of=/dev/nst0

 	or

dd if=dumpfile of=/dev/nst0 bs=65536

...or something else I've not thought of here?  (If it makes any 
difference, I run my tape drive with variable size blocks.)

-- 
+ Brent A. Busby,   UNIX Systems Admin	 +   "It's like being	+
+ James Franck / Enrico Fermi Institute	 +    blindsided by a	+
+     The University of Chicago		 +    flying dwarf..."	+

Re: [Dump-users] simple question about dumps to regular files

[Stelian P. <st...@po...>]

Le vendredi 24 f=E9vrier 2006 =E0 07:24 -0600, Brent Busby a =E9crit :
> Suppose I have some dumps that were dumped with '-b64' block size 64KB,=
=20
> and they were dumped as regular files to disk.  Now I decide I want to=20
> send them to tape.  What kind of blocking/reblocking things do I have t=
o=20
> worry about?  Should I:
>=20
> cat dumpfile >/dev/nst0

No.

>=20
>  	or
>=20
> dd if=3Ddumpfile of=3D/dev/nst0

No.

>=20
>  	or
>=20
> dd if=3Ddumpfile of=3D/dev/nst0 bs=3D65536

Yes (it will matter when you do read the tape, and you'll need one read
to return 64 KB at once).

> ...or something else I've not thought of here?  (If it makes any=20
> difference, I run my tape drive with variable size blocks.)

This is good. You could also use fixed blocking at 64 KB.

Stelian.
--=20
Stelian Pop <st...@po...>