[Bugme-new] [Bug 12481] New: mt takes two minutes to determine that the tape drive is empty
bugme-daemon at bugzilla.kernel.org
bugme-daemon at bugzilla.kernel.org
Sun Jan 18 18:37:25 PST 2009
http://bugzilla.kernel.org/show_bug.cgi?id=12481
Summary: mt takes two minutes to determine that the tape drive is
empty
Product: SCSI Drivers
Version: 2.5
KernelVersion: 2.6.28
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
AssignedTo: scsi_drivers-other at kernel-bugs.osdl.org
ReportedBy: kmshanah at ucwb.org.au
Latest working kernel version:
- This definitely used to work fine (no long delays) when we first installed
the tape drive, which was back in July 2007. As we usually keep up to date with
the latest kernels, I assume we were using 2.6.21 at the time but I don't have
any logs to prove it. At the time the kernel was also 32-bit, though I hope
that won't be an important difference.
Earliest failing kernel version:
- Unfortunately, I also have no idea when exactly it broke. It is definitely
broken on at least 2.6.27 and 2.6.28.
Distribution: Debian Lenny (x86_64)
Hardware Environment: Xeon X3350, 8GB RAM, LSI53C1020A, HP LTO-3
Software Environment: mt (GNU cpio 2.9)
Problem Description:
mt is taking two minutes to return the status information for our tape drive
when the drive is empty. It used to be almost immediate. I'm also fairly sure
it used to give a different message as well, something with "OFFLINE" in it,
rather than "rmtopen failed".
Steps to reproduce:
# time mt --file=/dev/nst0 status
mt: /dev/nst0: rmtopen failed: No medium found
real 2m0.709s
user 0m0.003s
sys 0m0.000s
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