Maybe the title should be \”When to NOT replace an SFP\” as I see in many occasions it is seen as a first option of fixing problems. In reality the SFP is one of the least failing components in the environment and replacing them more often leads to other problem than actually resolving the original […]
When to replace an SFP Read More »
OK, OK, don\’t panic. In 99.999% of all cases you\’re BNA management system is well dug deep inside the datacenter\’s behind a fair few layers of firewalls, switch ACL\’s and other physical or non-physical borders so bad dudes being able to exploit the vulnerability is relatively unlikely. Just in the event you still want to
Brocade Network Advisor vulnerable to SWEET32 Read More »
If there is one thing that gets people relatively annoyed is that their data is not available for a certain amount of time. You can\’t get to your sales data, orders cannot be fulfilled, your tracking and tracing options for your goods on their way to your customers does not show up etc. That makes
Data Corruption in Storage Area Networks Read More »
System administrators are very inventive and lazy. I know, I used to be one of them. 🙂 Everything that can be done to make ones life easier is about to be scripted, configured, designed etc. If you are responsible for an overall environment from Apps to servers to networks and storage you can make very
Host based mirroring kills your storage network!! Read More »
Arrays from all vendors have significant troubleshooting capabilities but in most cases these are scambled in the most obscure way you can imagine. You need special tools to be able to have a look at the log-dumps that come out of these systems. The nice part is that they contain a wealth of information including
Why frames get dropped at your storage array Read More »
There are occasions where you need to remove an entire zoning configuration from a switch. One of them is if you need to add a switch to an existing fabric and it still has a configuration in it. If these two conflict the switch will simply segment and the ISL\’s get disabled. Another reason might
Reset the Zoning Configuration and Prevent Mistakes. Read More »
In the IT world a panic is most often related to a operating systems kernel to run out of resources or some unknown state where it cannot recover and stops. Depending on the configuration it might dump its memory contents to a file or a remote system. This allows developers to check this file and
Appalling state of Storage Networks Read More »
One of the most complex ways of implementing long distance connectivity is using CWDM or DWDM extension equipment. Reason being is that the technology is often fairly complex and diagnostics in case of troubleshooting is most often done on a layer 1 level which means you need to have extensive knowledge of not only the
9.2 – Long Distance configurations – CWDM/DWDM Read More »
This subject will be divided in two sections. Flow Monitor and Generator Flow Mirror In FOS 7 the concept of frame-monitoring was introduced on Condor2 and Condor3 ASICs. This allowed an administrator to create a frame template based on the FC frameheader (see here) and obtain statistics on these frames. Flow Vision is somewhat progressing
Switch fabric configurations over dark fibre, direct connect, links are not much different then connecting them when they sit next to each other. There is no physical interference which has an impact on protocol behavior.
9.1 – Long Distance configurations – Direct Connect Read More »
