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TroubleshootingRSS

Storage troubleshooting

Netgear ReadyNAS Reboot Loop [Fixed] Video 7:46

A while back I had written a post about Netgear ReadyNAS units being stuck in a reboot loop,  time got away from me on this one and I never posted the follow up but thanks to the power of the Interwebs and Googles someone found the post looking for t ...
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How To Fix An Unavailable vSphere NAS Mount using SSH

In the lab, I have an isolated NFS datastore for ISO files to ensure that it is obvious whenever I have an ISO loaded to a VM. Nothing is easier to spot than seeing a VM being attached to the “ISO” datastore, which helps enforce cleanup and remind me what ...
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Poor performance and high disk latency with some storage configurations

Poor virtual machine performance Poor disk latency during backups Virtual disk latency

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Enabling the SSD option on SSD based disks/LUNs that are not detected as SSD by default

This article provides steps to enable the SSD option on SSD based disks/LUNs that are not detected as SSD by default

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new changes in VSphere /VDDK 5.1 SSL certification and security

There are some new additions to VDDK 5.1 compared to VDDK 5.0 related to SSL certification and secutiy. VDDK 5.1 hardened security and due to this backup application may fail with SSL related errors. VDDK 5.1 is updated with addtional details for the sa ...
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Use esxcli to troubleshoot storage

The esxcli command set may be used to manage your ESXi host storage configuration. In the following sections, we will demonstrate the commands necessary to resolve Pluggable Storage Architecture, VMkernel, and iSCSI related issues

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vSphere 5.0 Storage Features Part 8 - Handling the All Paths Down (APD) condition

All Paths Down (APD) is an issue which has come up time and time again, and has impacted a number of our customers. Let's start with a brief description about what All Paths Down (APD) actually is & how it occurs, & what impact it has on the host. ...
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Storage I/O Control with FAST Auto Tiering Support Statement Conflicts

I’ve been working on a vSphere 5 Architecture Design for business critical applications for a large financial institution and have run into a conflict in the support statement between VMware and EMC with regard to the support of FAST (Fully Automated Stor ...
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Reclaim Error when Configuring Remote SSD for Host Cache

I recently purchased a pair of Intel SSD drives for use with a Synology DS411 enclosure, and thought it would be a fun exercise to present part of the volume to my hosts as an "officially recognized" SSD drive type. This would allow me to further configur ...
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Unable to delete an inactive datastore.

I ran into an issue where there was a datastore present in the datastore inventory view that was no longer in existance. Deleting this datastore was not an option as after right clicking the delete option was disabled. First things to check...do you have ...
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Random ESXi LUN loss in an 8Gb FC Brocade infrastructure

Recently Dennis Agterberg, a fellow contractor, experienced some major issues with random LUN loss on all his ESXi Hosts. The environment consists of HP Virtual Connect FC modules connected to 8Gb Brocade switches. From a vCenter perspective repetitive “ ...
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SCSI reservation conflicts

Last week I had some trouble by a customer, 4 of my 8 datastores aren't visible/accessible on the 6 ESX 3.5u2 hosts connected to a (FC) HP MSA1500. Some datastores become unavailable and some were not affected. Numerous VMs were down, some of those with w ...
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All Paths Down!

I recently had the joys of helping deal with an All Paths Down (APD) situation which presented itself when removing a LUN from all the hosts in a cluster. If you do not detach the device first, which will also initiate an unmount operation before you phys ...
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Troubleshooting Storage Performance in vSphere – Storage Queues

We have all had to wait in a line or two in our life, whether it is the dreaded TSA checkpoint line at the airport or the equally dreaded DMV registration line, waiting in line is just a fact of life. This is true in the storage world too; storage I/O’s h ...
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Path failure and related SATP/PSP behaviour

This question came up in a recent conversation about what happens in the Pluggable Storage Architecture (PSA) when there is a path failure. It basically describes the roles played by both the Storage Array Type Plugin (SATP) and the Path Selection Policy ...
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