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тАО03-29-2005 06:38 AM
тАО03-29-2005 06:38 AM
Thanks in advance.
John
Solved! Go to Solution.
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тАО03-29-2005 07:44 AM
тАО03-29-2005 07:44 AM
SolutionMONITOR DISK/ITEM=Q/INT=1/VIEW=10
I wonder if some disk will show an excessive queue length.
Can you post more detail on your disk subsystem (scsi, FC) raid or not and so on.
Purely Personal Opinion
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тАО03-29-2005 08:42 AM
тАО03-29-2005 08:42 AM
Re: System slow
Please also do the following commands and post the output:
$ SHOW SYSTEM
$ SHO QUEUE/BATCH/ALL
One of the possibilities that I would like to eliminate is the possibility that you have a batch queue at an interactive priority, with a large,resource hungry batch job competing for resources.
- Bob Gezelter, http://www.rlgsc.com
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тАО03-29-2005 09:36 AM
тАО03-29-2005 09:36 AM
Re: System slow
Thanks for your replies. It's late in the day and everything is back to normal at this point. But here is the info you both asked for.
2 HSG80's running dual redundant fiber paths. We are letting VMS shadow. No raid whatsoever. I'm attaching a .txt as well.
Thanks,
John
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тАО03-29-2005 09:39 AM
тАО03-29-2005 09:39 AM
Re: System slow
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тАО03-29-2005 04:41 PM
тАО03-29-2005 04:41 PM
Re: System slow
I haven't dealt with disk queue length much, but I ran a test on my machine that is pretty heavily loaded, with a disk I/O rate of 50-100, and the average queue length is well under 1. I suspect that an average of 2 or 3 would mean at least one process is quite disk bound, and other users of the same disk will run slowly. I don't know whether that effect would apply to the whole affected controller or not.
I notice you have that one job that has consumed most of a CPU and has done a lot of I/O's, but it has done them over a long period of time (12-18 days). That would be between 700000 and 1000000 per day. That seems like quite a few if they are all disk I/O's, so it might be hogging quite a lot of one disk's throughput. Whether that would slow down everyone would depend on whether they are using the same disk or controller. I guess the process's CPU use isn't a problem because you have 3 CPU's. I assume its priority is not a problem, for the same reason.
I don't see anything else in your outputs that stands out to me.
--Travis Craig
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тАО03-29-2005 07:51 PM
тАО03-29-2005 07:51 PM
Re: System slow
$ MONITOR DISK/ITEM=OP
will tell you the operation rate to each disk.
If its found that a lot of I/O is going to DSA4 then
$ SHOW DEVICES/FILES DSA4
will tell you the files open on that disk - talk to the application people about what the files are.
Has the workload changed recently?
Purely Personal Opinion
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тАО03-29-2005 08:29 PM
тАО03-29-2005 08:29 PM
Re: System slow
queue lenght 4 (permanently) not so good for performance. Try to find hotfiles and separate this.
How looks interrupts on your system? (MONITOR MODE).
Petr
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тАО03-30-2005 02:31 AM
тАО03-30-2005 02:31 AM
Re: System slow
Ok, first things first. The queue length of 4 is a potential problem, if it persists for an extended period. If it is a momentary thing, it is not as much of a problem.
My curiosity is piqued by JOB0f UZ02DRV, however. In the 18 days that the system since the system has last been booted, it has accumulated 12 days of CPU time (translation, one of the CPUs has effectively been 66% occupied by this job since bootstrap -- presuming that the job started at boot time -- if it was started later, it is more suspicious).
Working from here, it is hard to diagose, but I wonder what that job is doing, and would suggest checking if the IO is originating with that job.
I hope that the above is helpful.
- Bob Gezelter, http://www.rlgsc.com
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тАО03-30-2005 02:42 AM
тАО03-30-2005 02:42 AM
Re: System slow
http://www.hp.com/hps/perevent/valupack/openvmssysadmin/vp002.html