Date: Wed, 17 Feb 2010 16:04:51 GMT From: Kirk Strauser <kirk@daycos.com> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/144043: USB DLT tape drive throws random errors Message-ID: <201002171604.o1HG4pnJ073341@www.freebsd.org> Resent-Message-ID: <201002171610.o1HGA5Et094189@freefall.freebsd.org>
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>Number: 144043 >Category: misc >Synopsis: USB DLT tape drive throws random errors >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Feb 17 16:10:05 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Kirk Strauser >Release: 8-STABLE >Organization: Daycos >Environment: FreeBSD jail2.daycos.com 8.0-STABLE FreeBSD 8.0-STABLE #3: Sat Feb 13 11:03:18 CST 2010 root@jail2.daycos.com:/usr/obj/usr/src/sys/GENERIC amd64 >Description: I have a Dell PowerEdge SC1425 server with a USB tape drive. From dmesg: umass0:0:0:-1: Attached to scbus0 sa0 at umass-sim0 bus 0 scbus0 target 0 lun 0 sa0: <QUANTUM DLT-V4 0A00> Removable Sequential Access SCSI-2 device sa0: 40.000MB/s transfers The problem is that it randomly throws tape errors during writes: # dd if=/dev/zero of=/dev/sa0 bs=1m dd: /dev/sa0: Input/output error 3272+0 records in 3271+0 records out 3429892096 bytes transferred in 136.946745 secs (25045444 bytes/sec) # dmesg | tail [...] (sa0:umass-sim0:0:0:0): failed to write terminating filemark(s) This doesn't happen *every* time, but often enough that Amanda backups fail regularly and I'm getting nervous about what would happen if I had to explain this all to my boss. To rule out hardware failure, I've repeated the experiment with identical tape drive units, different USB cables, different USB ports, and both used and new tapes. Basically, writes to that model of tape drive connected to that server will fail about half the time. This is a production server, but I can run any requested tests at night if need be. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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