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— | faq:misc09 [2011/04/30 17:31] (current) – created clemens | ||
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+ | [09] WHAT SHOULD I DO IF A SYSTEM CRASHES OR LOCKS UP? | ||
+ | | ||
+ | ' | ||
+ | your own data loss. | ||
+ | |||
+ | Also, it is important to note that you do not have a direct connection | ||
+ | to SDF and are mostly likely hopping through 10 or more networks to | ||
+ | get to SDF. You can use ping and traceroute to measure lag between | ||
+ | your computer and SDF. So, your experience of lag on SDF is subjective | ||
+ | and it is very important for you to understand that. | ||
+ | |||
+ | | ||
+ | file that is resident on the fileserver. | ||
+ | are trying to cat a file and instead of seeing the contents you | ||
+ | get either nothing or a message similar to: | ||
+ | |||
+ | | ||
+ | |||
+ | Be patient, the fileserver will recover shortly and your task | ||
+ | will be completed .. you will probably see: | ||
+ | |||
+ | | ||
+ | |||
+ | which means your request will actually begin to be processed. | ||
+ | |||
+ | | ||
+ | | ||
+ | |||
+ | load: 2.04 cmd: tail 12966 [select] 0.00u 0.00s 0% 808k | ||
+ | |||
+ | | ||
+ | is the ' | ||
+ | disk I/O, you'll probably see [biowait]. | ||
+ | you may see either [nfsrcvlk] (Network File System Received Lock) | ||
+ | or [vnlock] (Virtual Node Lock) which the system will usually | ||
+ | | ||
+ | on the NFS client should this state be prolonged. | ||
+ | |||
+ | In the event that the fileserver becomes unavailable, | ||
+ | | ||
+ | or suspend your jobs (^C, ^\ or ^Z) but rather, wait them out. | ||
+ | If you are patient your chances of losing data will be | ||
+ | | ||
+ | | ||
+ | it is the NFS client' | ||
+ | | ||
+ | |||
+ | More on this. SDF is pushing NetBSD to its limits and we are | ||
+ | | ||
+ | the uvm/ | ||
+ | in high usage situations such as the loads we experience on SDF. | ||
+ | | ||
+ | </ | ||
+ | |||
+ | [[misc|back]] |