THE BLOG

Renaming a stornext file system

Topic

As it’s quite easy on a generic local file system to change the label/name with data in place , it’s the opposite in a SAN environment.  In some (or even most) cases you have to offload the data, rename the file system and initialize it again. It’s also possible under StorNext , even if not well documented.

No can do? Yes can do!

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StorNext labels gone? DON’T panic!

Topic

In SAN environments labels are often used to address a specific LUN, rather than using the device identifiers or numbers, to simplify the addressing of devices. Plus, a device does not have to be tied to a unique device number/id.

Losing a label due to a crash, or a defective hardware part or simply because a client overwrote the label, leaves the administrator in a quite scary und definitely uncomfortable situation. Data can’t be accessed or could even be lost.

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StorNext performance: Allocation fill or round robin?

Topic

There are many ways to configure and optimize your file system under StorNext, and one option that makes (or can make) a difference is the allocation strategy. Which setting to use depends on your storage and the type of content you create. For the media and entertainment world we talk about unstructured data.

For the sake of this example, I create an imaginary setup with a StorNext based MDC and one 24bay RAID (dual controller) with 2 x 24bay expansion chassis. Continue reading

FibreChannel zoning template

Topic

A SAN (storage area network) provides the option of allocating resources for device load balancing and for selective data access only to certain users. This administrative setting is called Zoning and essentially allows the administrator to control who can access what data in a SAN.

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StorNext metadata slowness

Topic

As the  SAN environment contains many moving parts from the storage subsystem, fibre channel HBA’s, SFP’s, optical wire, the FC and Ethernet switch all the way to the metadata disks and the StorNext file system from Quantum it cannot really be called trivial. Every now and then you may struggle with performance issues that might be caused by any part mentioned above.
In such a complex environment you need to have some troubleshooting skills or you will end up ripping your hair out. Although there are many parts, I am going to focus on the StorNext metadata side in this article as I have seen it a few times now and users ended up remaking the file system.

Situation

Your SAN is working as expected with a decent performance; however, suddenly you hear from your users that browsing a folder takes a loooong time. Continue reading