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Old 12-04-2014, 10:23 AM   #1
7Finger
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Server Locks Up When Extracting Large File


Got a few servers with this problem. They are VMs running Red Hat 5.11.

When extracting a large file to an NFS mounted drive it locks up and has errors in the messages file stating that a process has stopped responding. I can't kill the process and the only way to recover is to reboot. Oddly, when I decrease the memory from 6G to 4G, the extraction works just fine. I'm sure it has something to do with how it is caching in memory as it extracts the file, but I don't want to have to decrease the memory every time I need to do a software upgrade.

Does anyone know what settings I would need to change to fix this?
 
Old 12-04-2014, 03:34 PM   #2
TB0ne
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Quote:
Originally Posted by 7Finger View Post
Got a few servers with this problem. They are VMs running Red Hat 5.11.

When extracting a large file to an NFS mounted drive it locks up and has errors in the messages file stating that a process has stopped responding. I can't kill the process and the only way to recover is to reboot. Oddly, when I decrease the memory from 6G to 4G, the extraction works just fine. I'm sure it has something to do with how it is caching in memory as it extracts the file, but I don't want to have to decrease the memory every time I need to do a software upgrade.

Does anyone know what settings I would need to change to fix this?
5.11 is a bit old...do you have the latest updates applied from Red Hat, and are you PAYING FOR RHEL? There were issues noted with NFS on RHEL 5.x, that were patched by RH. What version of NFS are you running on your NFS server and client?

Honestly, I've seen this problem before, and I never really came up with a decent 'fix' for it, but it's been a while since I've used RHEL 5. I worked around it by extracting to a local drive, then moving the file, which seemed to work.
 
Old 12-04-2014, 03:38 PM   #3
7Finger
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We are paying for RHEL and we have the most recent patches applied. The host is a NetApp appliance. We have hundreds of Linux VMs and only 3 or 4 have this problem, so I don't think it's an issue with the server. I have read something about dirty memory that looks like it might be related, but I'm not sure.
 
  


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