Bug 81938 - System hangs at end of ide-tape related operations
System hangs at end of ide-tape related operations
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
athlon Linux
high Severity high
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Assigned To: Pete Zaitcev
Brian Brock
Depends On:
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Reported: 2003-01-15 10:37 EST by Gavin Sallery
Modified: 2005-10-31 17:00 EST (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2003-08-01 16:56:46 EDT
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Description Gavin Sallery 2003-01-15 10:37:03 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.0.0) Gecko/20020530

Description of problem:
When I try to use my tape drive (Seagate Travan 10/20GB IDE), I encounter
reproducible system freezes at the end of whatever tape operation is attempted.
For example, restore -t will start the drive in motion, whirr for a bit (as
normal) but then freeze the system solid at the very moment you expect it to
complete. This also happens with tar, cpio but /not/ mt.

I am accessing the drive using the ide-tape module, on /dev/nht0.

This problem did not occur under RedHat 7.1

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1.put tape in drive
2.restore -t

Actual Results:  System freeze. Requires reboot.

Expected Results:  Contents of first file on tape should be listed

Additional info:

System is an Athlong 1.2GHz, with Abit KT7A motherboard (VIA chipset)
Comment 1 Pete Zaitcev 2003-01-15 11:48:38 EST
Something enabled DMA again, it seems. I thought we fixed that in initscripts?
mt does not transfer data blocks, only commands.

As a workaround "hdparm -d 0 /dev/hdc" should work.
Comment 2 Gavin Sallery 2003-01-15 14:49:06 EST
hdparm -d 0 /dev/hdd does indeed work, so this probably is the DMA bug I'd
thought was fixed. Which init script would you recommend putting the hdparm line in?
Comment 3 Pete Zaitcev 2003-08-01 16:56:46 EDT
I forget if RHL8 had multiply /etc/sysconfig/harddisk*, or only "harddisks".
On RHL 9, copy /etc/sysconfig/harddisks into /etc/sysconfig/harddiskhdd
and edit USE_DMA statement. If RHL8 does not support that, add the command
into /etc/rc.d/rc.local. Editing "harddisks" will kill DMA on disks, so
don't do it.

There were some arguments that ide-tape can be fixed for DMA,
unfortunately it seems there is no way to find which tapes were
broken except white/black lists.

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