Dan Langille schrieb:
> On 6 Oct 2007 at 10:41, Ralf Gross wrote:
>
> > How can I get information about how often a tape drive started/stopped
> > writing to tape? Is there a way to monitor the throughput of the SCSI
> > interface to the drive?
>
> On FreeBSD, I'd tell you to look at iostat. Output looks something
> like this:
>
> $ iostat
> tty twed0 cd0 sa0
> cpu
> tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy
> in id
> 0 30 31.02 34 1.03 0.00 0 0.00 62.99 1 0.08 3 0 2
> 0 95
>
> iostat -w 1 will output one of those lines every second.
I already tried iostat but I don't get any information about the
throughput of the tape device.
# iostat /dev/ULTRIUM-TD4-D1 1 -k
Linux 2.6.21-2-amd64 (VU0EA003) 06.10.2007
avg-cpu: %user %nice %system %iowait %steal %idle
1,44 0,00 1,15 0,38 0,00 97,03
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
This seems not so easy on linux, I'll try this:
http://sourceware.org/systemtap/wiki/WSiostatSCSI
Ralf
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