My Absence….

March 20th, 2009 No comments

I have been away from the Storage Blogosphere, Twitter, LinkedIn, Facebook for the past 2 weeks or so. Travel schedules have been so much hectic and so many scheduled meetings, its just hard to catchup with blogging these days. 

Have to read all about EMC’s new Flash drives, the 200GB and 400GB,  I believe i had a blog post about it earlier in Feb that we might see them with the new generation of DMX5’s. 
Need to catchup on Cisco’s UCS, I see everyone in the community has written something or the other about how UCS will play in this market. 
Heard a few things about EMC’s Analyst day last Tuesday and their vision into Cloud. 
And lastly, the rumor which now is the fact, IBM is pursing the acquisition to destroy the name brand SUN. Need to read what the views are, I did hear about a month ago, that a team of IBM high level executives have been visiting various SUN offices everyday through out the US. It was always in the planning….WERE YOU HOLDING SUN STOCK WHEN THE ANNOUNCEMENT WAS MADE??? Oh boy you missed it……
I guess a lots to catchup to do on the weekend . I did finish some technical posts on DMX4 and Clariion Technology last week, but haven’t had a chance to finalize it. Hopefully next week. 
Schedule next week looks very tight as well, at least 3 customer meetings scheduled every single day for Storage Analysis presentations, new PS engagements and selling some solutions. The week after, planning to head to London for some new business that is being kicked off, some training and some business contacts to catchup with…..
Very interesting month of March so far, hope the same for April……oh and I still need to do my taxes. 

EMC Symmetrix DMX-4: Components

March 16th, 2009 6 comments

In my previous posts on EMC Symmetrix 3, 5, 8 Series and EMC Symmetrix DMX, DMX-2 Series we discussed some important components that comprise in systems, in this post we will discuss some of the important components of EMC Symmetrix DMX-4.

EMC Symmetrix DMX-4 consist of 1 System Bay and (1 upto 8) Scalable Storage Bay’s. Each Storage Bay can hold up to 240 Disk Drives totaling 1920 drive in 8 Storage bays or 1024 TB System.  Systems  with special requirements can be configured to 2400 drives instead of standard 1920 drives.

The primary bay is the System Bay which includes all directors, service processor, adapters, etc, while the Storage Bay contains all the disk drives, etc.


System Bay (1 Bay)

Channel directors: Front End Directors (FC, ESCON, FICON, GigE, iSCSI), these are the I/O Directors.

Disk directors: Back End Directors (DA), these control the drives in the System.

Global memory directors: Mirrored Memory available with DMX-4, Memory Director sizes range from 8GB, 16GB, 32GB or 64GB totaling 512GB (256GB mirrored).

Disk adapters: Back End Adapters, they provide an interface to connect disk drives through the storage bays.

Channel adapters: Front End Adapters, they provide an interface for host connection (FC, ESCON, FICON, GigE, iSCSI).

Power supplies: 3 Phase Delta or WYE configuration, Zone A and Zone B based Power Supplies, maximum 8 of them in the system bay.

Power distribution units (PDU): One PDU per zone, 2 in total.

Power distribution panels (PDP): One PDP per zone, 2 in total, power on/off, main power.

Battery backup Unit (BBU): 2 Battery backup modules, 8 BBU units, between 3 to 5 mins of backup power in case of a catastrophic power failure.

Cooling fan modules: 3 Fans at the top of the bay to keep it cool.

Communications and Environmental Control (XCM) modules: Fabric and Environmental monitoring, 2 XCM located at the rear of the system bay. This is the message fabric, that is the interface between directors, drives, cache, etc. Environmental monitoring is used to monitor all the VPD (Vital Product Data).

Service processor components
Keyboard, Video, Display and Mouse. Used for remote monitoring, call home, diagnostics and configuration purposes.

UPS: UPS for the Service Processor

Silencers: Made of foam inside, different Silencers for System and Storage bay’s.



Storage bay (1 Bay Minimum to 8 Bay’s Maximum)

Disk drives: Combination of 73GB, 146GB, 300GB, 400GB, 450GB, 500GB, 1TB and now EFD’s 73GB, 146GB and 200GB available. Speed: 10K, 15K, 7.2K SATA are all compatible, each RAID Group and each drive enclosure should only have similar speed drives, similar type drives. 15 drives per Enclosure, 240 per bay, 1920 total in the system. If the color of the LED lights on the drive is Blue its 2GB speed, if the color of the LED is green, the speed is 4GB.

Drive Enclosure Units: 16 per Storage Bay, 15 drives per enclosure

Battery Backup Unit (BBU): 8 BBU modules per Storage bay, each BBU support 4 Drive enclosures

Power Supply, System Cooling Module: 2 per drive enclosure

Link Control Cards: 2 per drive enclosure

Power Distribution Unit (PDU): 1 PDU per zone, 2 in total

Power Distribution Panels (PDP): 1 PDP per zone, 2 in total


In the next couple of post, we will discuss EMC Symmetrix DMX-4 and some of its design features. 

Reducing Power Consumption on DMX3 & DMX4 Arrays

March 16th, 2009 No comments

Great Post by Diwakar on his Blog about reducing power consumption with DMX3’s  and DMX4’s

Google Chrome Users and Non-Users

March 16th, 2009 No comments

For all Google Chrome Users, you will enjoy the following videos.

I personally started using Chrome just as a experiment when it was a beta release. Really loved it…have been using since then…..

Used Internet Explorer for the past 4 to 5 years, then Mozilla FireFox for couple of years and since the initial release of Google Chrome have been using it. Google Chrome has completely changed the overall browsing experience with its speed, search, easy of use, tab browsing, light weight, bookmarking, etc.

A very kool Ad of Google Chrome on Youtube…..

If you are not already using it, here are some features of Google Chrome……


The Story behind Google Chrome……….check out the fundamentals of browsing….

Benchmarking Google Chrome final version…..


After all this, if you think you are ready to make the change, you can download Google Chrome here.
Run it as test for now, use it for about an hour everyday to browse your favorite sites and see if you like it compared to your current web browser. It will surely take a little time to get used to
Google Chrome and its features, but once you like it you are not going anywhere else…..