Dead iPOD shuffle 2nd Gen

Okay, so my ipod shuffle 2ng Gen got wet in rain while i was playing football. I dried it for a few days and kept it in rice box for a week but it just wont turn on!  :(

18 months later...  I had some spare time and took out my ipod shuffle with some cruel intentions 

Ready help from youtube and www.ifixit.com i was able to pull the ipod skeleton out of its body. 

Now i have no clue what needs to be checked and replaced. I have a multi meter and some ideas...  lets see how far it goes.

hope to cont.....

Super Drone

Some time in future...


Drones are everywhere. From delivering packages to commercial, house hold to Policing around solving crime cases. They are deployed in hospitals, schools and grocery stores. Drones that save wildlife, forest areas to putting out wildfire to watering plants.

Taking a leaf out of history book, we would certainly need a system to service and recycle these drones on the 'GO' to minimize any affect on how we live, thereby saving nature.

Nexus 3000 MTU

Nexus 3000 – System class MTU

Nexus 3000 operates in cut-through mode by default as a result the packet cannot be fragmented thus the need to have same Ethernet MTU is important.  This can be changed to store-forward mode by using the command “[no] Switching –mode store-forward”. Enabling store and forward switching mode might impact port to port latency.

                                    The system class MTU sets the MTU for all packets in the class and cannot be configured larger than the jumbo MTU (9216 bytes).  This is a system wide change and not specific to particular interface unless specific interface has an overriding service-policy configuration.

Config example:

policy-map type network-qos jumbo

 class type network-qos class-default

  mtu 9216

system qos

 service-policy type network-qos jumbo

• ·         Please do note that class-default is used, thus it applies to all traffic types.
• ·         Cut-through on N3K starts from packets at 560 bytes onwards. Smaller packets will be handles in a store and forward fashion.

Verify if the JUMBO MTU has been enabled/disabled

n3k# show hardware internal cpu-mac inband counters

eth3      Link encap:Ethernet  HWaddr 02:10:18:BE:7E:79 

          UP BROADCAST RUNNING MULTICAST  MTU:9312  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:0 (0.0 b)  TX bytes:192 (192.0 b)

eth4      Link encap:Ethernet  HWaddr 02:10:18:BE:7E:7A 

          UP BROADCAST RUNNING MULTICAST  MTU:9312  Metric:1

          RX packets:4242 errors:0 dropped:0 overruns:0 frame:0

          TX packets:2838 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:315148 (307.7 KiB)  TX bytes:288965 (282.1 KiB)

Nexus 3000 Switching Mode

In	Out	N3K Switching mode
1Gig	1Gig	cut-through
1Gig	10Gig	store and forward
1Gig	40Gig	store and forward
10Gig	1Gig	cut-through
10Gig	10Gig	cut-through
10Gig	40Gig	store and forward
40Gig	1Gig	cut-through
40Gig	10Gig	cut-through
40Gig	40Gig	cut-through

I/O Consolidation in Data Center

I/O Consolidation in Data Center:

Completed reading this book yesterday. The book covers the concepts and protocols in details. Chapter 2 & 3 talks about enhancements in Ethernet and deep dives into FCoE protocol, decoding the packets and contrasting between FCoE and FC. At the end a few case studies are discussed.

Combine this with Cisco Nexus documentations to have fun!  

Table of Contents can be found here