Date: Tue, 27 Jun 2006 22:50:42 +0930 From: "Jerlique Bahn" <jerlique@webscene.com.au> To: "'Eric Anderson'" <anderson@centtech.com> Cc: freebsd-scsi@freebsd.org Subject: RE: Viewing SCSI errors.. Message-ID: <005901c699ec$7d70bdb0$6400000a@WKSTN501> In-Reply-To: <44A12F44.8050703@centtech.com>
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> > I've added a tape drive to my server and the drive only seems to work at
> > 2MBps. The drive should be doing about 24MBps. The tape is a DELL 110T
> LTO2
> > which runs at about 86Gb/hr.
> >
> > I am trying to diagnose where my problems could lie, and was wondering
> how I
> > could see if there are any errors in the communication between the tape
> and
> > the scsi card (320Mbps). I'm quite confident the speed issue is related
> to
> > the tape drive or the scsi chain.
> >
> > Your suggestions welcomed.
>
>
> How did you measure the 2MBps number?
With iostat, eg
# iostat 5
tty amrd0 amrd1 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 12 57.81 2 0.13 53.21 6 0.32 31.99 24 0.76 0 0 1 0 99
0 46 8.00 0 0.00 0.00 0 0.00 32.00 88 2.74 0 0 0 0 100
0 16 0.00 0 0.00 16.00 0 0.01 32.00 87 2.73 0 0 1 0 99
0 15 0.00 0 0.00 0.00 0 0.00 32.00 88 2.74 0 0 0 0 100
0 16 0.00 0 0.00 0.00 0 0.00 32.00 88 2.74 0 0 0 0 99
JB
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