Bug 92049 – dump can't compress to remote tape drive

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Bug 92049 - dump can't compress to remote tape drive

Summary:	dump can't compress to remote tape drive

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Red Hat Linux
Classification:	Retired
Component:	dump (Show other bugs)
Sub Component:
Version:	9
Hardware:	i686 Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Mike A. Harris
QA Contact:	Ben Levenson
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Blocks:
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Reported:	2003-06-01 23:08 EDT by Damian Menscher
Modified:	2007-04-18 12:54 EDT (History)
CC List:	1 user (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
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Environment:
Last Closed:	2003-06-03 17:54:33 EDT
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Description Damian Menscher 2003-06-01 23:08:46 EDT

Description of problem:
If dumping to a remote tape drive, compression does not work.  For example 
(I've set the $TAPE and $RSH variables to allow auto-login):

dump -u0 /tmp   # works
dump -u0z /tmp  # does not work
dump -u0j /tmp  # does not work

When compression is enabled, it gives errors along the lines of:
  DUMP: write: Invalid argument
  DUMP: write error 30 blocks into volume 1: Invalid argument
  DUMP: Do you want to rewrite this volume?: ("yes" or "no")   DUMP: write: 
Invalid argument
  DUMP: write: Invalid argument

I'm guessing it's receiving compressed positioning commands, in addition to the 
compressed data.

Note that using compression to a local file works fine.

Version-Release number of selected component (if applicable):
dump-0.4b28-7

How reproducible:
Always

Steps to Reproduce:
1.dump to remote tape using -j or -z

Actual Results:  Dump fails with write errors

Expected Results:  Should have produced a compressed dump on the remote tape

Additional info:

I'm using a Seagate Travan 40 (ATAPI) drive, model STT3401A.

Comment 1 Stelian Pop 2003-06-02 09:23:34 EDT

RTFM:
              This option will work only when
              dumping to a file or pipe or,  when  dumping  to  a
              tape drive, if the tape drive is capable of writing
              variable length blocks.

You will probably have to issue a 'mt setblk 0', if your tape drive works with
this setting.

Stelian.

Comment 2 Mike A. Harris 2003-06-03 17:54:33 EDT

I take the upstream author (Stelian)'s above comment as indicative that
this is not a bug, but misuse of the application.

Closing NOTABUG.

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