Asset ID:	1-71-1004361.1
Update Date:	2010-01-21
Keywords:

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Solution Type  Technical Instruction Sure

Solution  1004361.1 :   Sun StorageTek[TM] 5000 Series NAS: How to plan LUN and Volume Layout for Best Performance  


PreviouslyPublishedAs
206032

Description
Description
Symptoms:

• Performance checking
  

Purpose/scope:

This document provides some basic guidelines and tips for LUN and Volume configuration for best performance.



Steps to Follow
Please review the following information.

Recommendations for Volume and LUN Layout

• Plan ahead for disk space requirements: Volumes that are allocated correctly from the beginning perform much better than volumes that are filled then extended. Create volumes that are large enough to store all necessary data, including future needs, In addition to planning space for the data, plan to reserve an 30% for free space. Also, plan for an additional 10% if the configuration calls for replication, and another 10% if a significant amount of checkpoints are planned.

• Use multiple, equally-sized segments for each volume, and select the segments from multiple LUNs and controllers. This allows each volume to be served by more controllers and spindles. <Document: 1011280.1>  shows a performance comparison of single segment volumes vs. mutliple segment volumes with some configuration examples.

• Distribute the client load across multiple volumes where possible, especially for write-heavy environments. Creating one very large volume for all write operations causes contention for resources and free space and reduces performance.

• When volume expansion is necessary, add multiple segments, and keep them the same size as the original segments if possible.

• Create a relatively small number of larger LUNs on the backend storage. Carving many small LUNs increases overhead and reduces performance. Consider limiting the number of LUNs to four or five per controller.

• Consider controller read-ahead settings appropriate for the application. Environments with many small read operations, such as email, should not use read-ahead. Environments with large contiguous read operations, such as video streaming, should use the maximum read-ahead settings.

Product
Sun StorageTek 5320 NAS Gateway/Cluster System
Sun StorageTek 5320 NAS Appliance
Sun StorageTek 5320
Sun StorageTek 5310 NAS Gateway/Cluster System
Sun StorageTek 5310 NAS Gateway System
Sun StorageTek 5310 NAS Appliance
Sun StorageTek 5220 NAS Appliance
Sun StorageTek 5220
Sun StorageTek 5210 NAS Appliance

Internal Comments
This document contains normalized content and is managed by the the Domain Lead(s) of the respective domains. To notify content owners of a knowledge gap contained in this document, and/or prior to updating this document, please contact the domain engineers that are managing this document via the “Document Feedback” alias(es) listed below:

storage-nas-domain@sun.com

The Knowledge Work Queue for this article is KNO-STO-NAS
NAS, performance, layout, volumes, normalized
Previously Published As
90741

Change History
Date: 2010-01-04
User Name: Will Harper
Action: Currency check
Comment: Changed title for findability
Date: 2007-10-03
User Name: 31620
Action: Approved
Comment: Verified Metadata - ok
Verified Keywords - ok (normalized)
Verified still correct for audience - currently set to contract
Audience left at contract as per FvF at
http://kmo.central/howto/content/voyager-contributor-standards.html
Checked review date - currently set to 2008-09-22
Checked for TM - added appropriate for STK title
Checked dependant article 86041 was published
Publishing under the current publication rules of 18 Apr 2005:
Version: 3
Date: 2007-10-01
User Name: 31620
Action: Accept
Comment:
Version: 0
Date: 2007-10-01
User Name: 147406
Action: Approved
Comment: Made a spelling correction. Doc looks fine.
Please perform the final review.
regards,
sushil
Version: 0




Product_uuid
77a19d66-bc99-11db-8069-080020a9ed93


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