To mount a volume: Open xSAN Admin from /Applications/Server. Under the SAN Components list click on the Volume you would like to mount. Click on the Clients tab for the volume. Click on the client you would like to mount the volume for (see Figure 2.x). Click on the Mount Read Only if the client system does not need to write to the volume. If the client system does need to write to the volume, click on the Mount Read Write button. Figure 2.x Mounting the Volume on a client Once you have mounted the volume, click on it using the Finder. Click on the Finder menu of the system…
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Xsan: Corruption
Volumes can become corrupt no matter what file system you are talking about (er, there might a magical file system out there that cannot become corrupted but I’ve never heard of it and would like to sell a certain bridge to you if you have). Xsan is no different and so you need to be ready to use the command line to combat said corruption. fsck is the traditional *nix tool to fix issues with volume corruption. cvfsck is the weird cousin that’s used for Xsan. If you see any iNode errors in your logs, corruption errors, high latency or just too many weird issues to shake a stick at…
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LinuxWorld Toronto
Details of the talk I’ll be giving at the upcoming LinuxWorld in Toronto, Canada: http://www.lwnwexpo.plumcom.ca/session_detail.cfm?id=239
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Web Hosting Primer
I originally posted this at http://www.318.com/TechJournal When you start a new hosting environment, you will probably handle many of the tasks that you will likely want your clients to handle later down the road. There are many products that help to ease the administrative burden of a shared hosting environment. These products empower users of your services to create their own accounts and perform other administrative tasks using easy to navigate web portals. • cPanel and Plesk are server management software solutions designed to allow administrators to create Reseller accounts, Domain accounts and email features. Administrators have the ability to assign users rights to various aspects of their hosting environment.…
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vm_stat
The vm_stat command in Mac OS X will show you the free, active, inactive, wired down, copy-on-write, zero filled, and reactivated pages for virtual memory utilization. You will also see the pageins as well as pageouts. If you wish to write these statistics routinely then you can use the vm_stat command followed by an integer. For example, to see the virtual memory statistics every 5 seconds: vm_stat 5
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WAF: Web Application Firewall
Web Application Firewalls, or WAFs, are firewalls for web application. They monitor web traffic and decide whether to allow or deny specific requests. IIS web servers (OWA), Apache, WebObjects, Lasso and other web servers will likely end up working with them, although I’ve only tested IIS and Apache at this point.
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Xsan: Zoning and Metadata
Only the MDCs are required to see the Metadata LUN. The rest of the clients receive the extents from the MDCs to write to the “data” LUNs. Yes the clients need to see the Data LUNs, but clients do not need to see Metadata LUNs. Before you can upgrade a client to an MDC though, verify that you can see the Metadata LUNs if you are zoning this way. It’s the most secure way but requires a little extra zoning.
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On the Road: San Francisco
There is upscale and then there is the Mission district in San Francisco. You know that line “don’t expect too much and I just might not let you down”? Well, that is the Mission district. But there is a mission here, and I do so love them. But even the mission is run-down. The mission from which the city gets it’s name. Indicative of the rest of the area. 🙁
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Article on Macs in the Enterprise
Interesting article with a little quote from me by John Rizzo on Macs in the Enterprise: Despite Growth, Apple Falls Short on Enterprise Traction