Issues with System Tap + iostat-scsi.stp + IBM Tape Drives

[Andy Wojnarek <andy dot wojnarek at theatsgroup dot com>]

Hi,

I'm trying to use STAP and iostat-scsi to gather tape drive performance statistics on my tape drives. I can't get any information from tape drives though.

Here is my info:

uname -a
Linux nos 2.6.18-274.12.1.el5 #1 SMP Tue Nov 8 21:37:35 EST 2011 x86_64 x86_64 x86_64 GNU/Linux

cat /etc/issue
Red Hat Enterprise Linux Server release 5.7 (Tikanga)

rpm -qa | grep systemtap
systemtap-1.6-7.el5_8
systemtap-testsuite-1.6-7.el5_8
systemtap-runtime-1.6-7.el5_8
systemtap-sdt-devel-1.6-7.el5_8

rpm -qa | grep kernel-debug
kernel-debug-devel-2.6.18-274.12.1.el5
kernel-debuginfo-2.6.18-274.12.1.el5
kernel-debug-2.6.18-274.12.1.el5
kernel-debuginfo-common-2.6.18-274.12.1.el5


nohup stap iostat-scsi.stp 1000 > stap.test &


I am only getting disk stats:
cat stap.test | awk '{ print $1 }' | sort | uniq

Device:
sda
sdah
sdai
sdal
sdam
sdan
sdar
sdat
sdav
sdb
sdf
sdh
sdv
sdw


ls -al /dev/tape/by-id
lrwxrwxrwx 1 root root   9 Dec 27 13:05 scsi-1IBM_3573-TL_00L4U78P6926_LL0-changer -> ../../sg5
lrwxrwxrwx 1 root root   9 Dec 27 13:05 scsi-32001000e111443b5-sg -> ../../sg4
lrwxrwxrwx 1 root root   9 Dec 27 13:05 scsi-32004000e111443b5-sg -> ../../sg3

If you could point me in the right direction I'd REALLY appreciate it. STAP is literally the only way I've found to get performance from scsi tape drives. It's 2012 and there is still nothing easy that allows this to happen. On AIX, I can do iostat -p and it will show me the tape drives.

Thanks!

Andrew Wojnarek |    Systems Engineer    | ATS Group, LLC
mobile 717.856.6901   | AIM: AndrewWojnarek | andy.wojnarek@TheATSGroup.com
	

Andrew Wojnarek?|????Systems Engineer????| ATS Group, LLC
mobile?717.856.6901?? |?AIM:?AndrewWojnarek?| andy.wojnarek@TheATSGroup.com