the san guy

Welcome to the SAN Guy blog! Thank you to everyone who has supported this site over the years with your comments and helpful knowledge sharing. I appreciate all of the positive feedback I’ve received over the years. I’ll continue to share posts relating to enterprise storage technology in the form of news, articles, troubleshooting guides, command references, scripting, and general administration information.

A new addition to my blog is the community forum, which anyone with a wordpress account can post to. I plan on sharing information on the forum in addition to my regular blog posts. I wanted to give the opportunity to my readers to share related content that may be useful to the storage community in general.

Below is a categorized site map of my blog posts.

      Scripting (Automation and Reporting)

Read Scripting Alias and Zone creation for Brocade Switches
Read Scripting automatic reports for Isilon from the CLI
Read Automating Config / Zone backups for Brocade Switches
Read Easy reporting on data domain using the autosupport log
Read Reporting on Clariion / VNX Block Storage Pool capacity with a bash script
Read Reporting on Trespassed LUNs
Read Reporting on Soft media errors
Read Disk space reporting on sub folders on a Celerra/VNX File CIFS shared file system
Read Reporting on LUN auto-tier distribution
Read Tiering reports for EMC’s FAST VP
Read Reporting on Celerra / VNX NAS Pool capacity with a bash script
Read Celerra replication monitoring script
Read Automating Storage Processor % Utilization alerts with EMC Performance Manager
Read Alerting on Celerra / VNX File SP Failover
Read Scripting an alert for checking the availability of individual CIFS server shares
Read Reporting on the the auto-tiering job state
Read Auto transferring reports from a Celerra to a windows web server via FTP
Read Auto generating daily performance graphs with EMC Control Center / Performance Manager
Read Pure Storage data reduction report
Read Reporting on the Estimated Job Completion Times for FAST VP Data Relocation
Read Scripting a VNX/Celerra to Isilon Data Migration with EMCOPY and Perl
Read Custom Reporting with Isilon OneFS API Calls

      Command Line (CLI) Reference Guides

Read EMC XtremIO CLI Reference Guide
Read ViPR Controller CLI Reference Guide
Read NetApp Clustered ONTAP CLI Reference Guide
Read Data Domain CLI Command Reference Guide
Read Brocade FOS CLI Command Reference Guide
Read VNX NAS CLI Command Reference Guide
Read Celerra Health Check with CLI Commands
Read Undocumented Celerra / VNX File commands
Read Using the database query option on Celerra & VNX File commands
Read EMC ECS CLI Command Reference
Read Isilon CLI Command Reference
Read Brocade Switch Type Matrix
Read Default Passwords for IT Vendors


This group of posts relate to specific technical issues I’ve had over the years, and the steps that I took to resolve them.

Read VMWare/ESX can’t write to a Celerra Read/Write NFS mounted datastore
Read Powerpath Install / Upgrade Issues
Read Can’t join CIFS Server to domain – sasl protocol violation
Read Powerpath commands in AIX causing unexpected errors / initialization errors.
Read Problem with soft media errors on SSD drives and FastCache
Read DM Interconnect failure with Celerra Replicator
Read How to troubleshoot EMC Control Center WLA Archive issues
Read A guide for troubleshooting CIFS issues on the Celerra
Read Unable to provision Celerra storage?
Read Long Running FAST VP relocation job
Read Frequent 0x622 and 0x606 errors in the SP Event Logs
Read Rescan Storage System command on Celerra results in conflict:storageID-devID error
Read Celerra / VNX File replication job creation errors when selecting destination
Read Errors when creating new replication jobs
Read VPLEX initiator paths dropped
Read Close requests fail on data mover when using Riverbed Steelhead appliance
Read Celerra Disk Provisioning Wizard incorrectly believes there are not enough drives available for provisioning
Read Web interface disabled on brocade switch
Read Dynamic allocation pool limit has been reached
Read VPLEX Unisphere Login hung at “Retrieving Meta-Volume Information”
Read Troubleshooting NAS Discovery issues on EMC Ionix Control Center (ECC)
Read VNX NAS Files incorrectly report as Locked for Editing


These posts are more instructional, and provide the steps necessary to resolve various hardware and software tasks.

Read Storage Performance Metrics
Read Storage Performance Benchmarking with FIO
Read Configuring a Brocade Switch for Access Gateway (AG) Mode

How to scrub/zero out data on a decommissioned VNX or Clariion

Disabling Telnet on Brocade Switches

Collecting info on active shares, clients, protocols, and authentication on the Celerra
Read Testing Disaster Recovery for VDM’s and CIFS servers
Read Generating and installing SSL requests, keys, and certificates on EMC ECS
Read Installing the EMC ECS CLI Package
Read VPLEX Health Check
Read Using the server_stats command on Celerra / VNX File
Read The steps for NFS exporting a file system on a VDM
Read Use the CLI to determine replication job throughput
Read How to reserve a Celerra / VNX NAS share for a single file type or group of file types
Read How to create a clone of a file system on a Celerra or VNX using nas_copy
Read Relocating Celerra Checkpoints
Read Upgrading EMC Ionix Control Center from Update Bundle 12 (UB12) to Update Bundle 14 (UB14)
Read Optimizing Java Memory for Navisphere / Unisphere
Read Adding a Celerra to a Clariion storage domain from the CLI
Read Strategies for implementing Multi-tiered FAST VP Storage Pools
Read Gathering performance data on a virtual windows server
Read Using Microsoft’s BranchCache with the Celerra & VNX
Read Adding/Removing modules from a datamover
Read Use the CLI to quickly determine the size of your Celerra checkpoint filesystems
Read Creating an NFS export from a file system on a Virtual Data Mover (VDM)
Read Matching LUNs and UIDs when presenting VPLEX LUNs to Unix hosts
Read Celerra data mover performance and port configuration
Read Easy File Extension filtering with EMC Celerra
Read Archiving NAZ and NAR files from EMC VNX and Clariion arrays
Read Using isi_vol_copy_vnx for VNX to Isilon data migration
Read Isilon SnapshotIQ and SyncIQ Management
Read Using the InsightIQ IIQ_Data_Export Utility
Read Changing the Login banner on a Celerra / VNX File control station
Read NetApp FAS Zero disk procedure
Read Block and File VNX Password Change Procedure
Read Filesystem Alignment
Read Mutiprotocol VNX File Systems: Listing and counting Shares & Exports by file system
Read Root replication checkpoints
Read A guide for troubleshooting CIFS issues on the Celerra
Read Isilon Mitrend Data Gathering Procedure


These posts are general articles about storage related topics. These represent more of my opinions on the subject matter rather than my other more technically detailed posts.

Read A Roundup of Storage Startups
Read Blockchain and Enterprise Storage
Read Storage Class Memory and Emerging Technologies
Read The Future of Storage Administration
Read Open Source Storage Solutions
Read Defining Software-Defined Storage: Benefits, Strategy, Use Cases, and Products
Read A Primer on Object Storage
Read Machine Learning, Cognitive Computing, and the Storage Industry
Read What’s the difference between a Storage Engineer and a Storage Administrator?
Read What is VPLEX?
Read What is EMC’s CAVA / Common Event Enabler?
Read Making a case for file archiving
Read What’s new in FLARE 32?


These are various posts I’ve made that don’t fit neatly into the above categories or may be a bit out of date.

Read VNX vs. V7000
Read VNX vs. XIV
Read Gartner’s Market Share Analysis for Storage Vendors
Read Magic Quadrant for Storage Vendors
Read Performance Data Collection/Discovery issues in ProSphere 1.5.0
Read EMC World 2012 – Thoughts on Isilon
Read ProSphere 1.6 Updates
Read EMC World 2015
Read Comparing Dot Hill and EMC Auto Tiering
Read Critical Celerra FCO for Mac OS X 10.7
Read What’s new in EMC Control Center Update Bundle 14 (UB14)?
Read EMC World 2012 – Thoughts on preparing for a VDI deployment

The SAN Guy - Blog Directory


6 thoughts on “the san guy”

  1. Hi,
    I have one question. WE have a VNX7600 storage. Recently we have upgraded its FAST cache from 512GB to 1100GB (Doubled it.) But post upgrade of FAST cache, the utilization of controllers increased by 20-25%. Before the upgrade the utilization on both the controllers were around 50-55% and post upgrade it is 70-75%. Ideally it should decreased. EMC has said it is the normal behaviour post upgrade because whenever FAST cache is upgrade utilization will increase and not decrease. I am not able to understand this. Kindly help in understanding this.

    1. Hi Rajeev,

      It’s hard to say for certain without analyzing your array. I can tell you that The FAST Cache driver has to track every I/O in order to calculate whether a block needs to be promoted to FAST Cache, which adds to the SP CPU utilization. When upgrading FASTCache the cache needs to be deleted and then it slowly recreates after the upgrade as it identifies hot data, which would lead to additional CPU workload at least in the short term. Your best bet for reducing SP utilization would be to Disable FAST Cache for LUNs unlikely to need it, especially LUNs that have sequential I/O, like oracle database logs. I’ll do a complete write-up of FASTCache best practices soon and review the other important things you should take a look at. Thanks for the comment!

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