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Tuesday, July 29, 2014

Force10 VLT - Design Verification Test Plan

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One my philosophical rule is " Trust, but Verify ". Design Verification Test Plan is good approach to be sure how the system you...
2 comments:
Wednesday, July 23, 2014

CISCO UDLD alternative on Force10

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I've been asked by one DELL System Engineer if we support CISCO's UDLD feature because it was required in some RFI. Well, DELL Forc...
Sunday, July 13, 2014

Heads Up! VMware virtual disk IOPS limit bad behavior in VMware ESX 5.5

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I've been informed about strange behavior of  VM virtual disk IOPS limits by one my customer for whom I did vSphere design recently. If...
Saturday, July 12, 2014

Why use VMware VM virtual disk IOPS limit?

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What is VM IOPS limit? Here is explanation from VMware documentation .... When you allocate storage I/O resources, you can limit the IOPS...
Monday, July 07, 2014

How social media and community sharing help entrprise customers

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I'm always happy when some one finds my blog article or shared document useful . Here is one example of recent em ail communication ...

VCDX Defense Timer

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If you are prepering for VCDX and you want to do VCDX mock defense you can use the exact timer which is used during real VCDX defense. Th...
Wednesday, May 28, 2014

DELL Force10 : VLT - Virtual Link Trunking

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Do you know CISCO's Virtual port Channel? Do you want the same with DELL datacenter switches. Here we go. General VLT overview Vi...
22 comments:

Locally Administered Address Ranges

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MAC Addresses There are  4 sets of Locally Administered Address Ranges that can be used on your network without fear of conflict, assum...
Sunday, May 18, 2014

How to convert thick zeroed virtual disk to thin and save storage space

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Last week I've been notified by my colleague about long term VMware vSphere issue described in VMware KB 2048016. The issue is that vS...
2 comments:

A/C Controller

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A/C Controller is FreeBSD based appliance which monitors environmental temperature and automatically power on/off Air Conditioning units t...

Hardware Infrastructure Monitoring Proxy

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Every enterprise infrastructure product like server, blade system, storage array, fibre-channel or ethernet switch has some kind of CLI or...
Friday, May 16, 2014

Unable unmout ESX datastore

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I've just been notified about annoying problem by customer for whom I did vSphere 5.5 Design. The datastore was not  posible to unmount...
3 comments:
Friday, May 09, 2014

Understanding Fibre Channel (FC) and Fibre Channel over Ethernet (FCoE) Terminology

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To understand the Fibre Channel (FC) and Fibre Channel over Ethernet (FCoE) capabilities of the, you should become familiar with some basic...
Tuesday, May 06, 2014

Recovering from a Forgotten Password on the Force10 S series switch

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I've just spent several hours to find the recovery procedure from forgotten password. Google returned just one relevant result to the ...
1 comment:

Simple TFTP server for windows

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Anybody working with networking equipment need simple tftp server. Typical use case is to download and/or upload switch configuration and t...
Monday, May 05, 2014

Microsoft Cluster Service (MSCS) support on VMware vSphere

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Microsoft Cluster Service (MSCS) is Microsoft cluster technology required shared storage supporting SCSI reservation mechanism. Microsoft h...

DELL Force10 : Initial switch configuration

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[ Previous | DELL Force10 : Series Introduction ] I assume you have serial console access to the switch unit to perform initial switch ...

DELL Force10 : Series Introduction

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I have just decided to write dedicated blog post series about DELL Force10 networking. Why? Who knows me in person is most probably aware...
Sunday, April 20, 2014

Potential Network Black Hole Issue

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When I do vSphere and hardware infrastructure health checks very often I meet misconfigured networks usually but not only in blade serve...
11 comments:
Saturday, April 19, 2014

How to fix broken VMFS partition?

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I had a need of more storage space in my lab. The redundancy was not important so I changed RAID configuration of local disk from RAID 1 to...