Tag Archives: Stornext

configure XSAN 4 – Yosemite – El Capitan

Situation

You want to connect an OSX 10.10 (Yosemite) or OSX 10.11 (El Capitan) client to your existing StorNext SAN or XSAN. Both OSX versions are XSAN 4 based.

Yosemite’s embedded XSAN version is compatible with SNFS 4.3 & 4.7.
The XSAN version within El-Capitan apparently is only compatible with StorNext 5.x but not with StorNext 4.7 as officially listed in the matrix.

I don’t claim to know it better as the officials from Quantum or Apple but if you look under the hood, the cvversion command returns a 4.3 build. Based on that and the knowledge that many other users have connected their XSAN 4 clients to a SNFS 4.7 based MDC’s without any issues of connectivity or data integrity (would be the worst case ever), it’s up to you to go that path and connect to an existing 4.7 based StorNext MDC and step outside the supported matrix.

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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

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

StorNext cvfsck free space fragmentation

Situation

Many StorNext users have a handful of tools that come with the default StorNext installation, basic or full blown with interface.

One of those tools which can assist in troubleshooting is cvfsck. The most common use of cvfsck is to verify the file system itself. It’s a simple and powerful command line tool if you use it for the right reasons.

Details

Checking the health of the file system can be done when the file system if active but not really recommended as the journal is updated frequently. It’s basically a sanity check which may lead you to the action to take the file system offline. Continue reading