Bug 640874
Summary: | Performance Tuning Guide: TRACKING BUG for [I/O] [I/O Alignment] | ||||||
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Product: | Red Hat Enterprise Linux 6 | Reporter: | Don Domingo <ddomingo> | ||||
Component: | doc-Performance_Tuning_Guide | Assignee: | Laura Bailey <lbailey> | ||||
Status: | CLOSED CURRENTRELEASE | QA Contact: | ecs-bugs | ||||
Severity: | medium | Docs Contact: | |||||
Priority: | low | ||||||
Version: | 6.1 | CC: | ddomingo, srao | ||||
Target Milestone: | rc | Keywords: | Documentation, Tracking | ||||
Target Release: | --- | ||||||
Hardware: | All | ||||||
OS: | Linux | ||||||
Whiteboard: | |||||||
Fixed In Version: | 6.1 | Doc Type: | Bug Fix | ||||
Doc Text: | Story Points: | --- | |||||
Clone Of: | Environment: | ||||||
Last Closed: | 2011-07-04 01:53:05 UTC | Type: | --- | ||||
Regression: | --- | Mount Type: | --- | ||||
Documentation: | --- | CRM: | |||||
Verified Versions: | Category: | --- | |||||
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
Cloudforms Team: | --- | Target Upstream Version: | |||||
Embargoed: | |||||||
Bug Depends On: | |||||||
Bug Blocks: | 639779 | ||||||
Attachments: |
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Comment 8
Sanjay Rao
2011-02-14 17:42:18 UTC
The comments that I added are for the IO vs Storage section. This section on IO alignment looks good. thanks Sanjay, revised the text accordingly. please review: http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Performance_Tuning_Guide/main-io.html#s-io-planning as for your clarification on "characterization", i was referring to this statement: <quote> There are many tools that can be used to do low-level I/O subsystem characterization. </quote> By "characterization" did you mean "profiling"? Yes. I did mean profiling. The hardware section in the document is still the old one. Please take a look at the modified section above which has responses to some of your original comments in the document and change it accordingly. Created attachment 479125 [details] pdf build as of Feb 17, 2011 i don't know why that is. i'll look into it; in the meantime, i've attached a PDF build to this bug for your perusal. (In reply to comment #12) > The hardware section in the document is still the old one. Please take a look > at the modified section above which has responses to some of your original > comments in the document and change it accordingly. Laura I found a few of the edits that I suggested are not in the document. In the following sentence, please replace the word "light" with "small". The word "small" used here is correct in the context because it refers to the IO size and not the IO rate. ---------- Hardware Every I/O sub-system has limits on how much data it can process per second. If your system hosts an application that needs to perform many "small" (ranging from 2k to 8k) I/Os, typically in transaction processing system, it is recommended that you choose storage subsystems that have a fair amount of controller cache, high-speed disks --------------- The first bullet in this section needs to be changed ------------ The amount of cache on the controller ranges from 1G to 64G (or higher), depending on the storage vendor. The most important factors to consider when choosing controller cache hardware are: * The amount of cache should be the determining factor in deciding which hardware to choose. * The rate at which the controllers can process I/O transactions --------------- Other than these the documents looks good. Thanks, Sanjay! I've changed: * light --> small * The amount of cache should be the determining factor in deciding which hardware to choose. --> The amount of cache, and Please take one more look so that you have final signoff on this content, and then we're done. :) Thanks! Thanks Laura. Those are the only changes I had. We are good to go. Verified based on c#18 in Red_Hat_Enterprise_Linux-Performance_Tuning_Guide-6-en-US-1.0-28 |