StorageTek[TM] 5000 Series NAS: Guidelines and cautions for free space and files per directory

Asset ID:	1-71-1012873.1
Update Date:	2010-01-06
Keywords:

Solution Type Technical Instruction Sure

Solution 1012873.1 : StorageTek[TM] 5000 Series NAS: Guidelines and cautions for free space and files per directory

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Sun Storage 5210 NAS Appliance
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 Sun Storage 5320 NAS Appliance
 Sun Storage 5310 NAS Gateway System

Related Categories


GCS>Sun Microsystems>Storage - Disk>Network Attached Storage

PreviouslyPublishedAs
217662

Description
Description

Symptoms:

Performance issues

Purpose/scope:
Observing guidelines for free space and the number of files per directory on the NAS can significantly enhance performance and usability.
The NAS OS performs best when an ample amount of free disk space can be maintained, and also when the number of files per 
directory can be managed, and this document outlines these guidelines.

Steps to Follow
Steps to Follow
For best performance, we recommend the following:

No more then 70% disk space used per volume.
No more than 10K files per directory.

If there is a requirement to use directories with larger numbers of files, consider locating these directories somewhere other than the shared or mounted directory. This ensures that the directories are read only when necessary, reducing system load.

Failure to follow these guidelines can result in poor performance or worse. In extreme cases where both of these are exceeded by a large margin, for example 100K files in a directory combined with 5% free space, it is possible to experience more severe problems, up to and including timeouts and/or extremely slow response times resembling a hang condition.

Note that the above recommendations should be considered guidelines. Actual thresholds may vary depending on many other factors, such as number of active connections and system load.

Also note that scheduled checkpoints will stop when a disk volume reaches 90% full, and some, but not all scheduled checkpoints will be deleted when a volume reaches 95% full.

Product
Sun StorageTek NAS OS v4.21
Sun StorageTek NAS OS (4..22)
Sun StorageTek 5320 NAS Gateway/Cluster System
Sun StorageTek 5320 NAS Appliance
Sun StorageTek 5320
Sun StorageTek 5220 NAS Appliance
Sun StorageTek 5310 NAS Appliance
Sun StorageTek 5310 NAS Gateway/Cluster System
Sun StorageTek 5310 NAS Gateway System
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:

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The Knowledge Work Queue for this article is KNO-STO-NAS.

NAS, normalized, disk space, utilization, hang
Previously Published As
90064

Change History
Date: 2010-01-05
User Name: Will Harper
Action: Currency check
Comment: OK to publish.
Date: 2007-09-20
User Name: 7058
Action: Approved
Comment: OK to publish.
No further edits.
Version: 4
Date: 2007-09-14
User Name: 7058
Action: Accept
Comment:
Version: 0

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