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OK y’all… I’m stumped on this one.
We have a dual 2.0Ghz G5 Xserve that is our office OD and file server. It ran Panther Server originally and then we upgraded to Tiger about 3 or 4 months ago. Initially we had some issues with Samba services and ACL stuff… things that were well covered on many OS X admin-type sites (including this one) but that sorted itself out as the patches started coming out. But then, round about the time we hit 10.4.2 I started noticing something odd.
I had been hosting our internal office web sites on the Xserve (although I’m not doing that anymore). I noticed that after several days of uptime the websites would start to slow down. They would take a long time to load… and the longer the server was up, the longer they would take. I’m speaking here specifically of php driven web-apps like the Mantis Bugtracker (http://www.mantisbt.org/). I originally thought it was some combination of php & mysql problems, so I tried rebuilding / re-installing each of those, but nothing seemed to help. Eventually I abandoned the Xserve for website hosting and put the sites on another machine.
After that I started to notice other weird behavior that pointed to a possible lower level problem. We back up our Data drive every night to a Backup drive using a script generated by Carbon Copy Cloner (basically a series of ditto commands). The data drive contains about 100GB of data. The first night after a reboot the backup will take around 45 minutes. The next night around 49, the next night around 53 and so on and so on. If the system gets to 30 days of uptime the backup can take around 3+ hours. The amount of data on the drive varies a little bit… but not THAT much. If I reboot the server, things speed right back up again.
Other weirdness includes the fact that if I open a simple vi session (vi somenewfile.txt) on the server it can take several seconds for the command to complete. It’s as if the system gets hung up allocating the filesystem resources needed to open the new file. Again, if I reboot, things are snappy as ever… but it gets a little slower every day.
I’ve replaced the system hard drive, done all updates, installed newest firmware, everything short of re-installing from scratch. It only seems to affect the G5 Xserve. Our G4 Xserve running Tiger Server performs just fine.
Anyone have insight into this mystery? Help is GREATLY appreciated.
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