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тАО06-07-2006 04:11 AM
тАО06-07-2006 04:11 AM
Monitoring throughput to the tape drives
Is there a way to monitor throughput of tape drives going from the server to LTO library ?
in SUN we use iostat -xtcnz {time}, were time is usually set to 5-10 sec.
Should be some utility from the HBA itself as well ?
Thanks
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тАО06-07-2006 05:10 AM
тАО06-07-2006 05:10 AM
Re: Monitoring throughput to the tape drives
As youve not specified too many details its a little hard to offer advice. However, most SAN switches offer decent performance counters for throughput on switch ports.
From the command line you can normally watch throughput at given intervals (usually nice and short) and from a GUI you can normally graph throughput and see spikes and lows....
Hope this helps
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тАО06-07-2006 06:11 AM
тАО06-07-2006 06:11 AM
Re: Monitoring throughput to the tape drives
Still, I need to run command on the box to see how much data I push to those drives.
HP-UX 11.11 library is IBM, drives are LTO3.
tape 29 0/12/0/1.98.15.255.1.3.0 atdd CLAIMED DEVICE IBM ULT3580-TD2
/dev/rmt/29m /dev/rmt/c45t3d0BEST /dev/rmt/s16m
/dev/rmt/29mb /dev/rmt/c45t3d0BESTb /dev/rmt/s16mb
/dev/rmt/29mn /dev/rmt/c45t3d0BESTn /dev/rmt/s16mn
/dev/rmt/29mnb /dev/rmt/c45t3d0BESTnb /dev/rmt/s16mnb
ext_bus 48 0/12/0/1.98.16.255.1 fcd_vbus CLAIMED INTERFACE FCP Device Interface
target 22 0/12/0/1.98.16.255.1.3 tgt CLAIMED DEVICE
tape 12 0/12/0/1.98.16.255.1.3.0 atdd CLAIMED DEVICE IBM ULT3580-TD2
/dev/rmt/12m /dev/rmt/c48t3d0BEST /dev/rmt/s17m
/dev/rmt/12mb /dev/rmt/c48t3d0BESTb /dev/rmt/s17mb
/dev/rmt/12mn /dev/rmt/c48t3d0BESTn /dev/rmt/s17mn
/dev/rmt/12mnb /dev/rmt/c48t3d0BESTnb /dev/rmt/s17mnb
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тАО06-07-2006 07:08 AM
тАО06-07-2006 07:08 AM
Re: Monitoring throughput to the tape drives
Strange enough there is no easy way to mesure tape throughput in HP-UX. Glance may be one idea but, perhaps not very easy. There has also been rumours about some enhancements in sar.
You can find some information in this thread:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1009939
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тАО06-07-2006 04:13 PM
тАО06-07-2006 04:13 PM
Re: Monitoring throughput to the tape drives
HP has a website you might find helpful to troubleshoot your problem. It has programs to see how fast your host can source data (HPReadData) and how fast your tape drive can sink data (HPTapePerf). Both can be used on both Windows and Unix platforms and can be quite helpful in giving you some baselines for performance. See if this helps you:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50460&locale=en_US#N10564
Cheers,
Curt
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тАО06-07-2006 10:43 PM
тАО06-07-2006 10:43 PM
Re: Monitoring throughput to the tape drives
You can get LTT free from www.hp.com/support/tapetools.
Note it doesn't run on Solaris - I saw the mention of Sun...
If you're interested in more general monitoring rather than troubleshooting - and since you're using HP's LTO - then you can pull a support ticket after a backup and look at the performance data in there. That will tell you reasonably accurately what the drive thought the native data rate was.
Due to a slight anomaly in the drive logs it's actually better to unload the tape first and look at the performance of the previous tape. Slightly odd but that's worth doing.
While you're there you'll find quite a lot of other useful information in the ticket. I'd be interested in feedback on that as this 'report' style ticket is a recent feature.
For example if you look at the margin of the data on the tape it'll tell you just how good your backup when - not just pass/fail.
Note you get a little more info on the tape side if you are using HP media too.
Regards, Richard (LTT)
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тАО06-08-2006 07:15 AM
тАО06-08-2006 07:15 AM
Re: Monitoring throughput to the tape drives
Do we have smth to monitor a running backup?
Without introducing new file copy to backup drive etc ?
Here is what I see in iostat on Solaris:
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.2 0.0 9.6 0.0 0.0 21.6 15.9 0 0 d3
0.0 5.4 0.0 5.9 0.0 0.2 0.4 29.4 0 2 d5
0.0 0.2 0.0 9.6 0.0 0.0 0.0 12.8 0 0 d13
0.0 5.4 0.0 5.9 0.0 0.2 0.0 28.5 0 2 d15
0.0 0.2 0.0 9.6 0.0 0.0 0.0 15.8 0 0 d23
0.0 5.4 0.0 5.9 0.0 0.2 0.0 29.4 0 2 d25
0.0 5.4 0.0 5.9 0.0 0.1 5.2 24.1 1 2 c1t8d0
0.0 0.4 0.0 9.7 0.0 0.0 0.0 12.2 0 0 c1t0d0
0.0 1.6 0.0 10.3 0.0 0.0 0.0 11.1 0 1 c1t1d0
0.0 5.4 0.0 5.9 0.0 0.1 4.8 23.7 1 2 c1t2d0
116.0 0.0 118785.4 0.0 0.0 1.0 0.1 8.3 1 96 rmt/15
0.0 63.0 0.0 64512.7 0.0 0.7 0.1 11.2 1 71 rmt/16
0.0 62.6 0.0 64103.1 0.0 0.7 0.1 11.9 1 74 rmt/43
63.2 0.0 64717.5 0.0 0.0 1.0 0.1 15.4 1 97 rmt/49
62.8 0.0 64307.9 0.0 0.0 1.0 0.1 15.5 1 97 rmt/52
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тАО06-23-2006 02:30 AM
тАО06-23-2006 02:30 AM
Re: Monitoring throughput to the tape drives
Looks like out of the box tools are not there yet. Recommended tools above assume you do it in your test environment and dedicate drives to the test.
I need to monitor ongoing backup without impacting its performance too much.
All we need is KB/s throughput. :)