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05-26-2011 08:26 AM
05-26-2011 08:26 AM
wait time , svc time, que depth, what is "interestingly" high in a generic sense
If you were drinking a beer at a baseball game, and a guy asked you:
What would you consider to be a high disk service time (in ms) or a figure that you'd be concerned that you were overloading the disk subsystem (a generic raid array), what would you say would be a number at which you would be "interested"?
Then what if he followed up and asked about an "interestingly high" level of i/o wait time (in ms)?
Finally, what if he said, huh, what disk system que depth would start to make you itch? (for mixed random/sequential i/o)
For me, I'd say:
I'd be interested at about 20ms for either of svc/wait times and really curious at 50+ms and when I was seeing 100ms, I'd think the system's i/o would be extremely sluggish. I'd say that I would expect to not see que depth over 5 most of the time and never above 20 for a long duration.
But I am rusty and I don't want to sound like a jagoff so I am seeking some grounding which I would not reference.
I know it "depends" (on a lot), but just looking for rules-of-thumb that drive you to look deeper.
What would you consider to be a high disk service time (in ms) or a figure that you'd be concerned that you were overloading the disk subsystem (a generic raid array), what would you say would be a number at which you would be "interested"?
Then what if he followed up and asked about an "interestingly high" level of i/o wait time (in ms)?
Finally, what if he said, huh, what disk system que depth would start to make you itch? (for mixed random/sequential i/o)
For me, I'd say:
I'd be interested at about 20ms for either of svc/wait times and really curious at 50+ms and when I was seeing 100ms, I'd think the system's i/o would be extremely sluggish. I'd say that I would expect to not see que depth over 5 most of the time and never above 20 for a long duration.
But I am rusty and I don't want to sound like a jagoff so I am seeking some grounding which I would not reference.
I know it "depends" (on a lot), but just looking for rules-of-thumb that drive you to look deeper.
1 REPLY 1
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10-29-2013 07:18 AM
10-29-2013 07:18 AM
Re: wait time , svc time, que depth, what is "interestingly" high in a generic sense
Adam:
I agree with you.
I agree with you.
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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