Recovering from a System Panic

In HP-UX terms, a system panic simply means that the operating system encountered a condition that it did not kno w how to respond to, so it halted your system .

System panics are rare and not alwa ys the result of a catastrophe. They sometimes occur at boot if y our system was previously not sh ut down properly. Sometimes they occur as the result of a hardw are failure. In a clustered environment, a diskless clien t node will panic if too m uch time has elapsed since its last comm unication with its serv er. This could be the result of nothing more than a LAN cable that has been disconnected for too long.

Recovering from a system panic can be as simple as rebooting y our system. If you have an up-to-date set of ￿le system bac kup or system reco very tapes, the worst case scenario would involve reinstalling HP-UX and restoring an y ￿les that were lost or corrupted. If this situation w as caused by a rare hardw are failure such as a disk head crash, y ou will, of course, ha ve to have the hardware ￿xed before you can perform the reinstallation.

Note

It is important to main tain an up-to-date bac kup of the ￿les

 

 

on your system so that, in the ev ent of a disk head crash or

 

 

similar situation, y ou can recover your data. How frequently

6

 

you update these backups depends on ho w much data you can

 

 

a￿ord to lose. For information on ho w to back up data, refer to

 

 

System Administration Tasks .

 

 

 

 

Dealing With Problems 6-9

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