English version of my posts.
Serials console is very helpful to troubleshooting Linux problem, you can see additional system message via serial console if your Linux server hung. It is essential component on physical server for troubleshooting. It’s challenge to manage serial consoles if your datacenter is very big. You may deploy console server for central management of serial consoles, … Read more
My wifi router was purchased one years ago, for some reason it’s not stable now, sometimes lost package when I ping it. After chat with my friends Steven, he recommended Cisco Linksys WRT54G2 which he is using, a very stable router. You can install DD-WRT firmware and leverage more new free feature, such as NFS, … Read more
Your HP server may runs fine on ESXi 4.x or 5.0, but you may get error message No NIC found with MAC address xx:xx:xx:xx:xx:xx after upgrade to ESXi 5.1 or later. That’s caused by network adapter firmware, you have to upgrade server network adapter firmware by HP SPP 2013.02 or later. I would recommend you … Read more
NetApp Virtual Storage Console is my favorite to manage and backup data on NetApp attached ESXi host, there is lot of benefits to secure VM data more efficient. The installation is pretty simple, and very less resource it requires, you can even install it on a multi-role virtual machine. But the first headache maybe the … Read more
大约在10年前，我参加过一个CCNA的培训，认识了当时给我们上课的老师——杨佳，那时候他已经是CCIE了。说到CCIE、CCNA，就要先说说Cisco（思科）了。网络是通过路由器、交换机连接在一起的，这个地球上60%以上路由器、交换机是思科制造，可以这么说，思科创造并提供着网络世界。CCIE是思科公司产品专家的最高级别认证，每年只有很少的人可以通过这个考试，因为考试内容几乎全部是上机实战，很少一选择填空，而且是全英文的，一旦拿到CCIE意味着你掌握了非常丰富的网络知识，可以真的称得上网络专家了。我的老师杨佳就是其中一名。 Today, I’m in company shutdown, have few spare time. I read his blog http://www.yangjia.org/, pretty interesting, look at his colorful life, come back to my life. That’s too much different! I admit single life is different with marriaged life, but that’s the life, the freedom I wanna to be! At least, I need some … Read more
It’s be a while. Provisioning, formatting, and re-provisioning. Compare each Linux distribution, finally I decide to use Debian, since my Raspberry Pi official image also base upon Debian. I also registered this brand new domain to re-start my blog life. 都不知道是第几次Hello world了，这次一定要开始了，先把之前在Wordpres的文章搬过来再说！
On today’s troubleshooting, I faced a very weird problem. vCenter Server services were up and running fine, it’s able to connect by vSphere client, but VMs, hosts show gray, and I cannot power on VM via PowerCLI. After went through each components of vCenter Server, I noticed the database size was 230GB, but only ~20 … Read more
Many company use service account for vCenter Server database and services. To compliance with security policy, you may need to change password of vCenter Server at regular period. This is a way I used to change password: 1. Change the password of service account of vCenter Server and database in AD. 2. Change the password … Read more
If you are using EMC VNX with ESXi 5.1, you may experience low performance when do storage vMotion or VM clone. This is a known issue on VNX, you have to disable VAAI feature to avoid this problem.
Sometimes VM may show unknown, invalid or orphan on vCenter Server, but it still running somewhere. Some technical support engineer may request reboot VM/ESXi host, or search on each host one by one. Declare: This article only apply to ESXi 5.1, I haven’t tested on other version. This is easiest way to find out which … Read more
