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When you need to only the change the unified ports inside an expansion slot of a Nexus 5500, you do not have to reload the entire switch to activate the unified port changes. You can simply restart only the module like this:
… Read morenx5548up-a# config t
nx5548up-a(config)# slot 2
nx5548up-a(config-slot)# port 1-16 type fc
nx5548up-a(config-slot)# end
nx5548up-a# copy run start
nx5548up-a# poweroff module 2
nx5548up-a# no poweroff module 2
This article is number one of a series about the upcoming network virtualization spree, specifically the one coming from VMware.
I spent 14 to 17 October at VMworld 2013 in Barcelona, basically getting my mind blown by the futuristic possibilities of network flexibility. Things are changing for the network, flattening the entire stack, distributing network services throughout the virtual network (instead of the monolithic central hardware), lowering network costs and making it more flexible and simple to manage.
In this post, I will go over the basics of the components that are used to form the VMware NSX virtual network.… Read more
When I read about the new powershell cmdlet New-MailboxExportRequest, I was very excited about it (because I was planning a migration for a few mailboxes).
After having to manually install several required hotfixes (some of which were related to .NET 2.0 (what the hell MS?)) and running through the SP2 upgrade process three times..I was much less excited: whatever I tried, the cmdlet that triggered me to upgrade, was nowhere to be found.
Turns out, the cmdlet does not appear to exist in the powershell-sphere, if you do not have the proper permissions (must be easier to hide commands … Read more
Today I had the need to remove the VLAN ID from 60 ESXi 5.1 hosts. Instead of doing it 60 times manually through the KVM, PowerCLI was enlisted for the job. That wasn’t the hard part, the one-liner is quite simple..For those interested:
Get-VMHost | Get-VirtualPortGroup -Name "Management Network" | Set-VirtualPortGroup -Name "Management Network" -VLanID 0
As mentioned, this wasn’t the hard part. It appears that vSphere 5.1 has a (pretty cool!) new feature that checks whether a network change has an impact on the connectivity of the ESXi host (like changing the service console VLAN ID or IP address) … Read more
Brad Hedlund‘s blog is one of my favorite sources of excellent UCS (and other general) material. I just found the exceptional UCS videos, which deserved a re-share.
In this video we take a look at the physical network architecture of Cisco UCS and incorporate the new capability of connecting both blade and rack mount servers to UCS Manager.
Here we look at how Cisco UCS virtualizes every significant component of the physical architecture; switches, cables, adapters, and servers. Then we look at how … Read more
When expanding your UCS environment, Cisco will deliver your new blades with the latest firmware. If you’re running an older firmware on your UCS setup, this could cause an issue with the blade discovery.
If the new blades are hung on the discovery process with BIOS POST issues, the following message can appear in the FSM tab of the server:
Waiting for BIOS POST completion from CIMC on server 1/1 (FSM-STAGE:sam:dme:ComputeBladeDiscover:BiosPostCompletion)
This can happen when then blades firmware is newer than the firmware available in the bundle installed in the UCS Manager. The easiest way to recover and complete your … Read more
For a very long time, fixing MySQL slaves was a tedious task. Slaves died, replication fails, tables would get out of sync and you’d have to import all the (consistant) data from the master database. Depending on the importance of the slave, this could mean downtime for your master while exporting.
MySQLdump is usually the application one uses to execute this task, locking the tables while exporting. For me, having a database readonly, is downtime. However you look at it, if your website is not 100% useable, it is experiencing downtime.
I came across Percona’s xtrabackup utility a while back … Read more
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