I had old UPS with serial port which was connected using Profilic USB to serial adapter. Sometimes this USB dongle had frozen and need to be restated – re-attached. This can be done in linux using IOCTL.
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To manage and monitor hardware raid, you need proper utility. Most of vendors provides raid utilities only for Redhat based linuxes. For Debian based distribution I have found very useful repository – http://hwraid.le-vert.net/wiki/DebianPackages. You just need to know, which raid card you are using and follow provided instructions.