On an IBM Power 6 (P595) system, the dump command reports a tape device as read only and mt status reports the device as write protected
# mt -f /dev/st0 status SCSI 2 tape drive: File number=0, block number=0, partition=0. Tape block size 4804435 bytes. Density code 0x0 (default). Soft error count since last status=0 General status bits on (45010000): BOT WR_PROT ONLINE IM_REP_EN # dump -0 -f /dev/st0 /boot DUMP: Date of this level 0 dump: Tue Feb 22 10:11:54 2011 DUMP: Dumping /dev/mapper/rootp2 (/boot) to /dev/st0 DUMP: Label: none DUMP: Writing 10 Kilobyte records DUMP: mapping (Pass I) [regular files] DUMP: mapping (Pass II) [directories] DUMP: estimated 48747 blocks. DUMP: Cannot open output "/dev/st0": Read-only file system DUMP: Do you want to retry the open?: ("yes" or "no") no DUMP: The ENTIRE dump is aborted.
On a P Series p595 system with two tape devices exposed by a VIO server, one of the tape devices will report as write protected even though nothing has been done to mark the tape write protected.
Red Hat Enterprise Linux all versions
IBM Power system p595 (LPAR)
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.