Curiosity Mars rover suffers computer malfunction
A memory problem with NASA's Curiosity Mars rover's main computer has prompted engineers to switch the rover over to a redundant onboard computer.
A memory problem with NASA's Curiosity Mars rover's main computer has prompted engineers to switch the rover over to a redundant onboard computer.
A problem with the memory on the Curiosity rover鈥檚 main computer has caused engineers to switch the rover over to a redundant onboard computer. This caused the rover to go into 鈥渟afe mode,鈥� which was anticipated in the computer switch. And so now over the next few days, the team will be shifting the rover from safe mode to operational status. They are also troubleshooting the condition that affected operations yesterday.
The聽@MarsCuriosity聽Twitter feed posted: 鈥淒on鈥檛 flip out: I just flipped over to my B-side computer while the team looks into an A-side memory issue.鈥�
JPL said the condition is related to a glitch in flash memory linked to the other, now-inactive, computer. in response to a memory issue on the computer that had been active.
The intentional swap occurred at about 2:30 a.m. PST on Thursday, Feb. 28.
鈥淲e switched computers to get to a standard state from which to begin restoring routine operations,鈥� said Richard Cook. .
Like many spacecraft, Curiosity carries a pair of redundant main computers in order to have a backup available if one fails. Each of the computers, A-side and B-side, also has other redundant subsystems linked to just that computer. Curiosity is now operating on its B-side, as it did during part of the flight from Earth to Mars. It operated on its A-side from before the August 2012 landing through Wednesday.
鈥淲hile we are resuming operations on the B-side, we are also working to determine the best way to restore the A-side as a viable backup,鈥� said JPL engineer Magdy Bareh, leader of the mission鈥檚 anomaly resolution team.
The spacecraft remained in communications at all scheduled communication windows on Wednesday, but it did not send recorded data, only current status information. The status information revealed that the computer had not switched to the usual daily 鈥渟leep鈥� mode when planned. Diagnostic work in a testing simulation at JPL indicates the situation involved corrupted memory at an A-side memory location used for addressing memory files.
Scientific investigations by the rover were suspended Wednesday and today. Resumption of science investigations is anticipated within several days. This week, laboratory instruments inside the rover have been analyzing portions of the first sample of rock powder ever collected from the interior of a rock on Mars.
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Nancy Atkinson is Universe Today's Senior Editor. She also is the host of the聽NASA Lunar Science Institute podcast聽and works with the聽Astronomy Cast聽and聽365 Days of Astronomy聽podcasts. Nancy is also a NASA/JPL Solar System Ambassador.
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