Archive for June, 2014

Find Isilon help content on the EMC Isilon online community

Kirsten Gantenbein

Kirsten Gantenbein

Principal Content Strategist at EMC Isilon Storage Division
Kirsten Gantenbein
Kirsten Gantenbein

You now have a fast and easy option for downloading EMC® Isilon® help content: visit the EMC Isilon online community.

Recently, the Isilon Community was enhanced in an effort to bring together Isilon-related content—including discussions and documentation—into one place and make it searchable on popular search engines. Here is a list of OneFS and Isilon documentation you can access immediately (you many have to log in to your EMC Community Network [ECN] account to access some of the documents).

Document Title

Overview

OneFS Version

OneFS Web Administration Guide A comprehensive guide to administering your cluster from the web administration interface.

 

OneFS CLI Administration Guide* A comprehensive guide to administering your cluster from the command-line interface. OneFS 7.1
Isilon Site Preparation and Planning* Learn about node specifications, switches and cables, networking topology, and other site installation topics. All versions
EMC Isilon Upgrade Planning and Preparation Includes steps for planning, completing, and troubleshooting a OneFS upgrade.
Backup and Recovery Guide Learn about methods for backing up your cluster, such as SyncIQ and NDMP. OneFS 7.1
Current Isilon Software Releases Learn which releases are available for Isilon OneFS, OneFS software modules, and Isilon firmware packages. All versions

* Requires an EMC Community Network (ECN) account

 

Search for technical white papers

The EMC Isilon Community also features technical white papers. White papers typically describe a solution to a specific problem or scenario. For example, you can download technical white papers on topics such as Hadoop implementation, data migration, electronic design automation, and multiprotocol security. To search for these white papers and additional Isilon documentation, go to the Content tab of the Isilon Community, click on the Document icon, and filter by the “documentation” tag.

How to find more help content

The EMC Isilon Community is a good source for Isilon-related content. However, additional Isilon help documentation is available only on the EMC Online Support site, including:

  • Knowledgebase articles
  • EMC Technical Advisories
  • Software downloads (except the OneFS 7.1.0.1 simulator, which is available for download on the EMC Isilon Community)
  • Help documentation for all OneFS versions

To begin your search, first log in to the EMC Online Support site, go to the OneFS product page, and enter your search terms. Watch the video, How to find content on the EMC Online Support site, for more information.

Start a conversation

Have a question or feedback about Isilon content? Visit the online EMC Isilon Community to start a discussion. If you have questions or feedback about this blog, send an email to isi.knowledge@emc.com. To provide documentation feedback or request new content, send an email to isicontent@emc.com.

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Top 20 EMC Isilon support documents in May 2014

Kirsten Gantenbein

Kirsten Gantenbein

Principal Content Strategist at EMC Isilon Storage Division
Kirsten Gantenbein
Kirsten Gantenbein

One of the goals of this blog is to share the most useful EMC® Isilon® support-related content that we have to offer. In this post, we’re highlighting 20 of the most viewed knowledgebase (KB) articles and product documents from the month of May.

We hope these documents will help you to quickly find an answer to a common question or resolve an issue.

Top 10 KB articles

To access these KB articles, log in to the EMC Online Support site. Articles in bold are new to the top 10 list this month.

  1. OneFS 7.1 SMB and Authentication Rollup Patch (174372)
  2. OneFS 7.0.2 SMB and Authentication Rollup Patch (172623)
  3. Best practices for NFS client settings (90041)
  4. How to reset a node to factory defaults (16696)
  5. How to upgrade firmware on Intel (QLogic) 12300 and 12800 InfiniBand switches (170524)
  6. Troubleshooting performance issues (88844)
  7. How to create a bootable image of OneFS on a USB flash drive (16691)
  8. OneFS 7.0.0 – 7.0.1.2: The SmartConnect zone is not available, or all clients connect to one node in the SmartConnect zone in OneFS 7.0.x (91535)
  9. OneFS sysctl commands (89334)
  10. How to reimage a node using a USB flash drive (16582)

 

Top 10 product documents

To access these PDF documents, log in to the EMC Online Support site. Documents in bold are new to the top 10 list this month.

  1. Current Isilon Software Releases
  2. OneFS 7.1 CLI Administration Guide
  3. Isilon Supportability and Compatibility Guide
  4. OneFS 7.1.0 MR Release Notes
  5. OneFS 7.1 Web Administration Guide
  6. OneFS 7.0.2 Administration Guide
  7. OneFS 7.0.1 Administration Guide
  8. Current Patches for Isilon OneFS 7.1
  9. Current Patches for Isilon OneFS 7.0
  10. OneFS 7.0.2 Command Reference

 

Start a conversation

Have a question or feedback about Isilon content? Visit the online EMC Isilon Community to start a discussion. If you have questions or feedback about this blog, send an email to isi.knowledge@emc.com. To provide documentation feedback or request new content, send an email to isicontent@emc.com.

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Understanding Global Namespace Acceleration (GNA)

Colin Torretta

Colin Torretta

Senior Technical Writer
Colin Torretta

Latest posts by Colin Torretta (see all)

With the proliferation of solid state drives (SSDs) in data centers across the world, companies are finding more and more ways to take advantage of the high speed and low latency of SSDs in unique and exciting ways. Within the EMC® Isilon® OneFS® operating system, one of the innovative ways Isilon is using SSDs is for Global Namespace Acceleration (GNA). GNA is a feature of OneFS that increases performance across your entire cluster by using SSDs to store file metadata for read-only purposes, even in node pools that don’t contain dedicated SSDs.

GNA is managed through the SmartPools™ software module of the OneFS web administration interface. SmartPools enables storage tiering and the ability to aggregate different type of drives (such as SSDs and HDDs) into node pools. When GNA is enabled, all SSDs in the cluster are used to accelerate metadata reads across the entire cluster. Isilon recommends one SSD per node as a best practice, with two SSDs per node being preferred. However, customers with a mix of drive types can benefit from the metadata read acceleration with GNA regardless of how SSDs are placed across the cluster. When possible, GNA stores metadata in the same node pool containing the associated data. If there are no dedicated SSDs in the node pool, however, a random selection is made to any node pool containing SSDs. This means as long as SSDs are available somewhere in the cluster, a node pool can benefit from GNA.

For more information about GNA, see the “Storage Pools” section of the OneFS web administration and CLI administration guides.

Important considerations when using GNA

Here are some important considerations to keep in mind when determining whether GNA can benefit your workflow.

  • Use GNA for cold data workflows. Certain workflows benefit more from the performance gains that GNA provides. For example, workflows that require heavy indexing of “cold data”—which is archive data on stored on disks that is left unmodified for extended periods of time—benefit the most from the increased speed of metadata read acceleration. GNA does not provide any additional benefit to customers who already have solely SSD clusters, because all metadata is already stored on SSDs.
  • SSDs must account for a minimum of 1.5% of the total space on your cluster. To use GNA, 20% of the nodes in your cluster must contain SSDs, and SSDs must account for a minimum of 1.5% of the total space on your cluster, with 2% being strongly recommended. This ensures that GNA does not overwhelm the SSDs on your cluster. Failure to maintain these requirements will result in GNA being disabled and metadata read acceleration being lost. To enable GNA again, metadata copies will have to be rebuilt, which can take time.
  • Consider how new nodes affect the total cluster space. Adding new nodes to your cluster affects the percentage of nodes with SSDs and total available space on SSDs. Keep this in mind whenever you add new nodes to avoid GNA being disabled and the metadata copy being immediately deleted. SSDs must account for a minimum of 1.5% of total space on your cluster.
  • Do not remove the extra metadata mirror. When GNA is enabled, an SSD is set aside as an additional metadata mirror, in addition to the existing mirrors set by your requested protection, which is determined in SmartPools settings. A common misunderstanding is that the SSD is an “extra” mirror and it can be safely removed without affecting your cluster. In reality, this extra metadata mirror is critical to the functionality of GNA, and removing it causes OneFS to rebuild the mirror on another drive. See the graphic below for information on the number of metadata mirrors per requested protection when using GNA. For more information about requested protection, see the “Storage Pools” section of the OneFS Web Administration Guide.
The number of metadata mirrors required by GNA per requested protection level in OneFS.

The number of metadata copies required by GNA to achieve read acceleration per requested protection level in OneFS.

 

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