Software Considerations
There are also software issues to consider. First, is the controller you are thinking about purchasing supported by Linux? If there is support, is it open source and integrated into the kernel? Or is it available only as a kernel patch or as a binary-only kernel module?
Integrated open source support is obviously the best bet when choosing any piece of hardware for use with Linux, although in some rare cases. a vendor-provided kernel patch might be more desirable.
Be extremely wary of binary-only modules. Forward compatibility is never guaranteed, and support is available only from your vendor, instead of the vast community of open source developers. And you can’t fix problems that might arise on your own because you don’t have access to the source code.
The availability of user-space tools—that is, tools that are run after the operating system has loaded—is also a consideration. After all, the potential high-availability features of RAID aren’t much good if you have to restart your system to run BIOS-level configuration tools to perform essential administrative tasks such as creating a new array, managing failed disks, and adding new spare disks. So, when choosing a controller, look for a vendor that provides open source drivers, preferably integrated into the current stable kernel tree, as well as some user-space management tools.
So far, I have not found any vendor-provided, open source management tools. However, I have been told by at least one vendor that ...
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